VIRUS đọc để hiểu nhiều hơn, khắc phục những sự cố khi gặp virus

Đề Án : Mạng máy nh, Internet, Virus
VIRUS
VIRUS
virus máy tính !"#$
%#$&'()*++,-./0$12
3$4#.56#789:::%:
;.+/<=4,#>2(4?
@0AB(C3$=='(
D)=EF3 &#G#$@8?:::H.&IJ3
K:
L&;+M.DI-GIJ
-2)4B)./K#.5&$2M;+
G#N"2D.)0*4O !%<
H=>2+,H$=P3#
2:
Q+CRST4*2G#$"$G4 !G
$U VW'0/<G$$ !NC+
;:XD !BU VCH>2;$
E'#$G$:QY3,PU V3
/0>D4/PG$ZF%C3
'C+G$YD !U VHK
2MG$/P(Y#FNG3#[Y
'':
Các loại Virus máy tính thường gặp:
L+/)4(,.'*2M$3[E2/)3
C=4+?#),3,-G2I
4E:C+DYD/)WM;.3
2M\#$(]^XN0?3,5E
D/N?($E[.>2$N0&(3,^:
Virus Boot
_7`

Đề Án : Mạng máy nh, Internet, Virus
L$MDINa$#.CBE:
Zb '0#$(a34=#.#N>$DI2J2;
)Bc77:Cad#$=2M#K
:
B/)<==)'(@89<=
B/)[-:e)'($3G!)2G$
U VZFfF:::%:g)2FG$/);3,/"M
 !:e)*3C,<JCJB89<=
$E#$^a7^:
\a#$C $&#.$a7:Q\a[
$h/K5<=;0,G$)2
#C:
Virus File
Z$&#.$&6#7'(28/+N#$CG$
U V6#73D<=::7F7:/:2i::::/))=6#7
'(*/K5Y#$#E)$+2!(6#7
'(B/),#.$:Q3#[2M+27/)[-
@^jY#.$6#7)#)D#$k#7]^:Q.0#P
<#K2,B:L/)*/+2MC*;A
`RRlj;FNG$m$C#bBEF;&
_7n
Đề Án : Mạng máy nh, Internet, Virus
;3&k#7%CH JY#.$k#7D,
E#$k#7:
C/)YD20##"#)$(-+#)
#.6#7$YMDIFNG$#.#=&:
B/)/K5#.6#74N/)C !2M G;N
,1$/=8?B($#CG;$0FN,Nh:
Virus Macro

Z$#)#.$&6#7A/0jiU %6#7/0ji
oF7#%6#7( 5ji_V7_%/=jipi67:j
#$CB&)*++,/8A6#7
Bpi67:QE3,$Hq=4$$h#M
#$2M$q#M#-GE2 !0/;
D#H2#H2#)&4:Q3,,DG Jj
4G#),r3-=#H2#)3
/P=CM N:
L$C-+#)jYM*^GB^$M
DI !+&:a3=s#$ G^t3N0
j^^u##j^s$a[FN03
$DM/+E320#$D$r9;GN
03Y[/K G7:L+/)D J+
Yv,b3#$((/)C Js$3[E2/)#)/@
h#;&/N,EwFNGFNG*#.:
2/)3 !DGB((DCs
$/)Ds^t3N0j^(aW G&
*FF#$%:
_7x
Đề Án : Mạng máy nh, Internet, Virus
Con ngựa Thành Tơ-roa - Trojan Horse
>&$ -$=,3#$=+&yZ)2$
$'z:$'z#$=$(C4.yZ)2D3,
=>2$:LyZ)2*9=+0E#3,#)$
'z=-h8#r:g-$$C
F4&.#w/!-FD$+$w/C
:
_'22CY#$${2 !:;
{#$=)*'(HOÀN TOÀN KHÔNG CÓ TÍNH CHẤT LÂY LAN:
eMCO+{/P$3#w42' !'(B

(H12{|;H/G#$ )U%,F.
>2$H#C).:e+,>#{[A"2D
CB).4O !>}:::,
B.B3<C)H3,F &#G+#>2(;:
aC){A"2D4=4G;Y
 !,HC{NC/G
• a Z){$H$).[-<
=8 K!212OND7%3,+4wF;
).w33[>$-G#G$OND:
• _M0/N222zu V7$2MG2z
g2V7~.3K !E4(8
V7/HK727%(+HK727%•
#C!-=G222%V7/0/) G
V7/:QE/>F.>2$B/)/)D(€1
A•&V7/3= D#$)V7//O3
2M•HE72M52D>
2M/O377%:
Sâu Internet – Worm
_7‚
Đề Án : Mạng máy nh, Internet, Virus
g.c77ƒU#$#)3?#.#=$28/+NG:
U+20?2)BH.MB{$'+#$-
#.#$&O+/K3,<$=O2)
;Y4.:C/,j7##Z7Z77:\;-#.#E
*#$C#G$#)G4B#$"c77:
,/MU J,W&2/P(
KW8KWu 7/%B$3#.5$-3
7#;&KW(:
L&KW$(N#$KWB/)/|.
$:::BB<&/K5:e,#$3,0)KW

#$KWBB<&KWB=./Ns$3„
'&7#$3= €>.•H€N2 d•, !
h><6#7|:j=4I d= B=
7#=2B).,)2M= B7#0):e
$E27#0)3O€>•'$> 5/K"#w:L&G
$ 5$/)D/+:\;$$'-C&
).U3,3#.#C$M7N24.:e
3#b0)WI$+rr$j7##$Z7Z77#)3,
#.#;$!GC$M:QCB3U^g.
c77^( G&^/I^w$
C^$.^c77:
\;-#.#$=#;>UO+$C
AH/Gv)0AKJ=$$r
#)w).$G%ND$=KW$3:L$
EI3,7aX0#C).212B.
BE>2$B).$#$B?rC3
=/N222:
L$GU*<=,/r0#.#
)O$277277#.#89fga K!
_7l
Đề Án : Mạng máy nh, Internet, Virus
"?%H/G#$#h82M,
#.#:Q2MN#$G$$ K!C3%#D}
&#h…#h8#h$/=G$D20#E$Y3, 5
$2G:=#h82M2GD#.3[
FNG30A#h8$,#.5#C
wF=.M$B$$D/+:w
$U[+2!^/I^C)c77;?
'-:
Rootkit

†#$/=D!2M+3 !,7N-
r)$)=B&+(H&6#7$4:
eH,B†#$30A}+(6#7$0 &#G7
;U V%:L+W J&D!28/+BG$^†7
o ^^j7^^k k#7^(D,2G6#7$+(
$:
L$3I30A#)D4+4)#)2/N
&IB7#7%:QY3,† J&G4
2†#${(E3&$
7=7NH/K# !,7N'(=):
X-$?)=B†G4$3,†$n
#)
• Rootkit hoạt động ở mức ứng dụngy)=J?;'
(DU oF7# >33,#$=
'(? !:‡?$† !=4ˆ>
 7{7)6#70:::,G2$? !P
-G!7N+(6#77::
:
_7‰
Đề Án : Mạng máy nh, Internet, Virus
• Rootkit hoạt động trong nhân của hệ điều hànhKernel%y)=
J?;(,+/K 7% 7, 
r) .:e.#$?N2BG4(>†3
N#;;G4:
e4; !D,2G†3)=
/=;#$=DJ3:\(>2/K5†
4N/)C+-E2BC:
L+B/)H2&G/N/)3*
1$* !0j7,F7+()C
DN3(H/G3,B/)*/K5†:a)*#C

#);.$)C[; d
/)F#b:
Lược sử của virus
Q3,#KBG:‡.WCN""
$&,N$3E3,,+'
#)
• LA`R‚RŠL7`RSxz`Rl‹%2,0#b+-
./0B='(:
• \$4>2C`R‰SM>2C`R‹S*FNGCfF
``SŒ='(#$^_7 u#^-33,4;2M
B>2-$:ZE33G:
• LA`RŒ`QMCFNGG$Bu22#7
cc:
• LA`RŒx)e)yLQ#i)ysk7 Q7#MM
G27K9$:
• LA`RŒ‰\^7a^._Q%MC
))_/<a$u{ :Q'($P2M<
=/7%B= 9x‰S/$3[#.5N08 9
:e.#$#)^7#^MC:
• QY`nA$Xpg2#$
^\X7^:L330A-12*B($G2-$
7F7/#76#7%$2)\ut…\jg:
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Đề Án : Mạng máy nh, Internet, Virus
• LA`RŒ‹\MCND$ :#$^Z7^:
• LA`RŒŒ\Š7#7NDr#))$D
4$$?g`x:e.#$#))=7rrB
4/8>$$#)J=,%:
• ``JA†/7jnn8+V+?
Bu†_uLo#$#G0‰:SSS:j/K2)JxA$`S:SSS

##:jH J>P+(^^/77%:
• LA`RRSQ'(')4MC/<L:
• LA`RR`\(2#2%MC#$^7##^:
Z)$/+-8(?B3.-3A'
(4:
• LA`RR‚L&+G(#I4*,=
G0/N0D<N0&G3!w
^~ 7^ I/KE/{7#7%BE:e.#$=#)0
F%MCFNGCG$# !$^M
G^B>G$,)-#.,:
• LA`RRl\A/0%MCFNG*
G2BU $#N:Z)$3,#$
G$B:j#$#)+/PD&#>2
(\#a? !\au%$J70A3,#5
? !A2IBji
U oF7#_V7_pZ::::Z)$8+3
a•$ZFFNGA`RR‰3,P0U oF7#:
g$j7#A`RR‹ND'`G#/<=G2
|,U /P$+KWBp#
*/K5:\7A`RRR3,PG2U 
oF7#$_V7_:
• LAnSSS\Z7aI3CcZp\oŽpf#w+(B
:e.#$=#):eH,#$3 JD>2 )
^cZp\oŽpf:F:7F7^:Z !,+Bp#/N7HK
qD ):7F7[-=/K N:L$$I3=H
;B2V73(C$*>2BB$
"):?(3#$=C_#227:C$
/8(_#2273#>wK&)
:
_7Œ

Đề Án : Mạng máy nh, Internet, Virus
• LAnSSn0Bj7#X Z:g/KFnSJ:
• LAnSSx\g#7=#)V#;>4W#!
0‹l$`S2E:
• LAnSS‚e N=+G;B#$Vg7:\;$(
DM20<|BG$WM<##$B
3F.>2$:QY#$g7D$$B)$W
#$B<C>'$D3#$-<=<#):
0BV$Y#>2=W#!")7%8+ON
W;`Œ8g7Še?:>(I@8C$‹
AnSSlCIe?W2)$xAJ7$xS#=D
:
• \;0AB7$3,F.>2/P/O
*$$BG$$h<B2M
N#$'(Grw3#@"2'74
+)G:X 3G(r42[
$3':Qji*+)2M28/+Y#$
=).:y*20C?&$2$N2M
P+>B2MY2$+GB
3 K!772%P0DG3NDB:
L 9C;2M3$G I*r(;
E$07b9B-$W3#b+:e.Y#$'
=$0FN#)2M/0G3N !m:
• '#DF3#[[+C/;3/r
,)q32#27ND/P?
,%$I+2;B)B2MG22V7%:
er33,ND$G$?DN
+"$=G$=N2BU V
G:\$3#[[D>#$DM%82'?
ND# !,+BY'(:

\#C
• g.V%#$'(Y30A-./0-(
#G4)#$G4G%:e,
M#b<.$)v#C/K5G!BV#$
2)7V%D#$00A)=0B
))$:L$2.PV;N
_7R
Đề Án : Mạng máy nh, Internet, Virus
)$H2))<.V#$=#)H
/G:
U8+N)/<†/7j$A`RŒŒ:L33,#$@
/N(G$fLct$Cc77:>3#[Vr)#.N
#$22RR+G3B33C#${:QV$[
8= G2Vxn: ##BU V$-/0BE+
KWh#MG77:
• _M#V7%&12B#$iV7%W
2M3A.)V${7:
• {y7.#$#)'(Y3)'-W
#$3D-./0:L+# N#$D
 .:e,w#)$BWG(>2{
7rF33#$F:CD39#$D,3
{7CJ=G4:Q&O)2M$[
 !ˆA#>2(B(,#>;2
#C):e.Y#$#)-s,:L33,B8?B &
#G:
• _MG22V7%e.#$#)30A.>2-
+2$G$$D,#)^ ?^:=4'(
G3|( G2V7 G14;^ K^:
• _M0 V7%Z)2M0N3<
'($H0wC):j=42MD)=4

30A,KDK$(•+ !:
• a7Z$&/K/"3$,/<D
{:::
eH/G,#$/72'/$w7DMˆ>
#>2(:L3/;wnSfgX<#C7:y>0B
3,#)D@N$0:L+#C+;=G4#;33
,40= G2:
L3Bg7<g/7#J;=20?BD/0>X7i77
Z/*(=/7)CV7/3C#$j727:
! I#GH3, ! Gr/,3,8
7bWG K@N=$ND:
_7`S
Đề Án : Mạng máy nh, Internet, Virus
7X7i77Z// j727,*#.5'`G_Q
C$M:>(,I*3#C#)&3$/^$7^
$,D_Q/K5B/KK#b
/0/0>BU V$&( G)Ch_Q:
L&D!)/$, 5 JC322M#$A4_Q/K
5/2GM.: !Š7Š7u7n`
8jˆ</Q#i/KCl‹J(*>$= 
G2^7^#/N -$/7,‚SS:SSS^$C^$
x,//K/"<y$ZJA;#$.^M*^
,'`lG_Q•
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II:
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,AN#$GB.CA2I:Q2M,$N&
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= KG:_-G/P !G
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=G4/K2G:L*/++ $
G$v)ZFg#$=42C/0
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H-$HE$ 7D #7.G
$77# #7%:
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``A;H.$3? !B
_7``
Đề Án : Mạng máy nh, Internet, Virus
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\$x$0FN2M4<.aL#$_ giV7
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:M''-^$0FN^'(/7&
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-G>-<C?)=2'?;M

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, 5 $N3:
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>*,*3 &#G==.$I=(;D
2!#):
• Q>a %=G4>#$=2'
22B!?- JDH,&
>2wF;=4"D/K2G/<G
D:Q>3,3(?='($
H !ap67H>g…aj~$H=
9/Ns4$G9QX)Bg'C=
)U V%H3,#$=84;='(222z3
#$3|;{:
Danh sách các đuôi tệp có khả năng di truyền và bị lây nhiễm
Q>2CG$U VD<=30A/K
ND:
• :/jiak#7G2F#7#D%
• :Q277 yjZy7#2k#7G2$#G ; )1yjZ%
• : Q 6#7iU VLG2-BU VL%
_7`n
Đề Án : Mạng máy nh, Internet, Virus
• :Q 6#72%G2-%
• :2#Q#_7#7F7G2BQ#_7#%
• : jiU G2B'(jiU %
• :7F7oF7/#7k#7G2-%

• :#2y7#26#7G2= E2 J%
• :yjZu22#’ !yjZ%
• :{Šg2k#7G2Šg2%
• :{7Šg2o 7 g2k#7G2*Šg2%
• :#gk#7G2 d%
• :jic##7k#7G2$H%
• :2i_cik#7G2D'(%
• :7†7k#7G2G2$W†7%
• :g77g7_/#7oF7/#7k#7%
• :U Vg2Q27
• :/X7gk#7
• :g7##g2p/{7
• :/\#ak#7
• :/7\#ao 7 g2k#7
• :/\#ak#7G2#>2(/<\#a%
• :VU Vg2Q27
• :ViU Vg2k#7
• :VU Vg2yk#7
_7`x
Đề Án : Mạng máy nh, Internet, Virus
• :“”•Q#cXQZgcX%k#7oF7
Các hình thức lây nhiễm của virus máy tính
 Virus lây nhiễm theo cách cổ điển
Q8,NB-#.5/$;B##$
D+/K#& =;.9$9QX?'
(#$2'G/K# !N,2:L$9
N !(2'?#.5$,8fga
9? =H+/K0ˆ>4:
 Virus lây nhiễm qua thư điện tử
;#.5DG#.5

4:
*#.5$).3,-( K
WGq3$3-=$#)#%
&KW(N:L+B.B>/K5
$D/K2G+2!,#.5$#)+2!(
+KW$+27:Q(>4#23,A7N2
4.+="$$G/K#.5
3,#$C#G'C$+;=N":
$2M0#bG+2;2M G3
,"2!$=-./0$#),2+KW
 /)B).(B.2,(
?-2/PrKW>2;3:
Phương thực lây nhiễm qua thư điển tử bao gồm:
 Lây nhiễm vào các file đính kèm7G7 #%:3
 J[D/K5;6#7|/K5
) H ,$^(^/<C
N2 d7F,0/2M;DJO%
 Lây nhiễm do mở một liên kết trong thư điện tửQ#C+G
3, d+=V7/$q$
#h8B( G$G$:j=#C+ d;G
-=)*$/K3,/K#.5:
_7`‚
Đề Án : Mạng máy nh, Internet, Virus
 Lây nhiễm ngay khi mở để xem thư điện tửQ$DJ,
/<M)6#7H<#C+*3,/K#.
5:Q$Y#hBG$:
 Virus lây nhiễm qua mạng Internet
7-2,=*Bc77C+;$G(?
#.5c77<$2'?B$
:

Q3(?#.5$2M=)Dc77

 Z.5D6#7$#G2MZ$#.58
,+(?6#778,9
9fga:::%/P0wc778D2M
:::
 Z.5>2V7/$H7
D(H4b%QV7/3,3?*,=
.#.5$2M=)$B
!>2$V7/3:
 Z.5H+,D#h
/0>G$? !q3CG$H2M
B*?/e$3,34;=4
!CH3,# !#h/0>BG$
2Mq3CG$ !U Vj7 _#7%H
#h/0>B2MB*?/ !u/†7 7%
,#.5H+,).
<6#7#C+;2M$:
 Biến thể
j=(?'+)=B#$)/+,B
E:a+,B#$-8*rP!
-2GB2M GH#$8$=B3:
j=4#)3,-)/+,.3A
(2G$C GE:j=4/+,FNG 
/K> )B2M G0H
H/+*BE%*+#).N2H0+
E,+2!2:
_7`l
Đề Án : Mạng máy nh, Internet, Virus
Virus có khả năng vô hiệu hoá phần mềm diệt virus

Một số virus có khả năng vô hiệu hoá hoặc can thiệp vào hệ điều hành
làm tê liệt (một số) phần mềm diệt virus. Sau hành động này chúng mới
tiến hành lây nhiễm và tiếp tục phát tán. Một số khác lây nhiễm chính
vào phần mềm diệt virus (tuy khó khăn hơn) hoặc ngăn cản sự cập nhật
của các phần mềm diệt virus. Kể cả cài lại HĐH và cài anti sau đó nhưng
đã quá trễ.
Các cách thức này không quá khó nếu như chúng nắm rõ được cơ chế
hoạt động của các phần mềm diệt virus và được lây nhiễm hoặc phát tác
trước khi hệ thống khởi động các phần mềm này. Chúng cũng có thể sửa
đổi file host của hệ điều hành Windows để người sử dụng không thể truy
cập vào các website và phần mềm diệt virus không thể liên lạc với server
của mình để cập nhật.
Cách phòng chống virus và ngăn chặn tác hại của nó
Q3=.3PĐể không bị lây nhiễm virus thì ngắt kết nối
khỏi mạng, không sử dụng ổ mềm, ổ USB hoặc copy bất kỳ file nào
vào máy tính:LCE($3OE$G
-A<4#$AC+;N#;:
D,vK""/0G$`SST;
,)$2M,=E3,)+
+43,$3/G22/0G &#GB(:
 Sử dụng phần mềm diệt virus
a0G/P/KC=2M G30A>
/+#)$#C!>2> &#G,2M3
#D>/+;:
zCKG3N2M G:
;\GL%aQjQ:
QB;$u27u\~ogo:
\$2$/<jijig7o7#:
 Sử dụng tường lửa
#k7V##%D20=(3FHW $

$N2 K!77cg_%$h
.YM20 !#,/0G;$
_7`‰
Đề Án : Mạng máy nh, Internet, Virus
2M=): !#D$$
4;,=D?H3Bb:L+
=2M=)*$$3$=+4
c77(#3,0/E2 !#)/@
HDGE:#E2AH+4+
D4,0'/K,$b4
H$H$'(=):
 Sử dụng tường lửa bằng phần cứng+ !+4;)
c77D= 73?A$:D<+=H
KB$0FN(?A^#^/K" !3,
>2$ 7,212G#-/>%:g !#/P2M
?D20G4$/<EWAH+4+
212 3+2 !#/P2M:
 Sử dụng tường lửa bằng phần mềmLG$U V
$*2qA#/P2MC
D2MB*?/3,#$G4'$
2D!';#2Mq3BU V:\ !
/=2M–7u#g7g7B*–7Z/#$=/=D!
/0G&G;2M=)42$#:
 Cập nhật các bản sửa lỗi của hệ điều hành
yG$U V+4%#D#D/K2G
#h/0>/<-D !B3H3,#
!#h/0>,+,H2
$2M=):L !#DM>2>
/0#hBU VDV7/ji
f2 7G.N2N02MB*

ji%HU Vf2 7W>2>C
U V%:Q4N*H+=.N2&%-
=uf2 7%BU V:A$Wh
4;/0U V$ji>NPE
222:
 Vận dụng kinh nghiệm sử dụng máy tính
Q J !N02M$2'?C
d30A/K#.5$2M=)/<d
;>2>K24;2M G:L
!M !G,?A? !q3G
_7`‹
Đề Án : Mạng máy nh, Internet, Virus
$$G,/0GG$$ &#G
B(:j=4G0
• Phát hiện sự hoạt động khác thường của máy tínhe2M
!D337$H•/@2MH
FC#$G$8z39#$=- !8Kz[
>/+-8B:\ !'0L>
N-)=>)2B>N+4$
D#BG$HB*?/
DD/@-212>2$H-)
=B#%:j-)=$+D
20 2M?.(M-FNGB:L
3M,/P>2> &#G;N2M
 GH !=2M G,1$
G4:
• ,? !)=,-)=B
2MG4Dj7H2MB
*?/v)_7\7V7%,/+=2C#$G/(
G4)2? !$E+#/=;

/C+Q_f/CC6#7)=#$(:::3
/NBG4 J3/,GB-5%Y3
,3-$3$=2Iw2#b:C$
I@=-,NKB !:
• Z)/@=4ABG$3,)G-#.
57HKU V212A
E2 !>GG-=$H2M
9QXH9fga$G4:QA$
=4#)# !,#.5w"8fgaH9
QX2M$G4=$#)#N
M.D8fga/P)6#7:
C8fga,-)"8fga$%:QM#)
/@A$/P2MB*?/UoufcH
8†7:
• g !CV7/2122G-+t7C
2M^_M G-+^)/$2M G
Bảo vệ dữ liệu máy tính
 L+D""`SSTP3,D/K#.5
$2M,=(/)C-/0G-$—B &#G
B(; &#G/K@ H0'
$-@B+/K#& &#GB%:
_7`Œ
Đề Án : Mạng máy nh, Internet, Virus
2)/$+/)3,0b<

 Sao lưu dữ liệu theo chu kỳ#$/G22E"NG,/0G
&#G:a)3,FC# &#G7s+='
$+/K;<=8fga8? =9:::%
(?$3,-G7s$MH's7
?=>2>8B &#GB/):

 Tạo các dữ liệu phục hồi cho toàn hệ thốngD w#)Gq
3BG$ !g7†77BU Vj7t_:::%$3,M
+2MB*?/ !/)3,)/0#G
4/P2M2M)089H2.J
:
-N$=CD""#$ &#G#
D/K#.5+3(2C/0>2>;
'B2M G'#3,#)/@E:
Có thể bạn chưa biết:
#K2,3N#)
Cl#) ;.#$l#)*.G)CN:
1. #7•`S…nSS`%
;AnSS`$;#7•FNG
#.57#
!C#$/K5
!u3/K5(
Bu[-=$#)7#
;
Cu%:C#7•*#$=B'#$-
/)CB/K5$#N/Ns=$3
4$#$:e$+GFK--/K5<
_7`R
Đề Án : Mạng máy nh, Internet, Virus
C3A'N !u5a3 /)B
u$#7•[) a,7#KQ--aD/K
5#7•%:
2. g˜Zg#7…g227`…nSSx%
g˜Zg#7I#$g227ND$B)ji
g˜Z$3 !B$,<) K!XXg;!C
:QW$2END$77MCg#73,.D

4#/KND$.:g#7#$B2)#$C
#GG4ujBaiu7G4R``B$24g7#7G
47zBQ7#u#7)jˆ:™;G) g227.
*#C;'`šfgXC$+;:
3. jX`…nSS‚%
jX/"MFNG$`AnSS‚$<$2
N#K:o#
5VjX
 N#$7##h+
 !<7#F7#b )
$=6#7|<
jX[-=7#;N
0& /)
r-2=/0$
!O6#7–u:
~4#7•jX3,0)
7#DW#$0)
7#w /)C
3I30A J7#C),0)KW:
jX›#Gœ;?/<3$Ž$~#7Y/K)> 
0:
_7nS
Đề Án : Mạng máy nh, Internet, Virus
†N.@r4BjX:yM+/
P$FN2wL:jX?/C( I&€u „cœ
{ {/27#•$CP.#$=
H$,2)?D20#$#$(C:
4. g7•L7nSS‚%
j=&3Ng7$L7#$E)/<
=+C`‹8e?3C#$g7

Š:jH J.#$#)E
4#>2($@;
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<[/K 5
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\$RAnSS‹4 CN30w
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XXpgƒw4 K!:g
UY3#EK
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 J,NDB4g2:
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Đề Án : Mạng máy nh, Internet, Virus
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