- .
3 :
1. ,
2. - , , ,
3. - ,
:
1. Virus. ( ) - , / , , . , ( ). , . 1884 . :
1.1. - . ( , ) , , , . CIH - - , , .
1.2. - . :
1.2.1. Overwriting. - , , ,
1.2.2. Parasitic. - , ,
1.2.3. Companion. . , , . , .
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1.2.4. Link. - , , . Obj, lib .
a. - (, ), , , :
i. - , , ,
ii. - (boot sector) , MBR boot sector' . ,
iii. - -, , - , ...
iv. . Java script, php, vbs. , , , html
b. : :
i. ( ) . .
ii. - , .
c.
i. . Stealth-virus , , , , , .
ii. Polymorphic. - , - . ,
iii. Root kit. - , , , , .
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2. Worm. - , , , . :
a. E-mail worms. - , , , , , , , .
b. P2p worms (peer to peer).
3. ( , , ) - . , , . "", . :
a. - , , .
b. Backdoor Trojan, . . , . .
c. Trojan spy. - . , - key logger, , . key logger' , , , scrin shot' . , trojan psw (password stealing ware) -, , , , .
d. Trojan internet clicker. - - -
e. Trojan internet dialler - () , .
f. Trojan downloader. - , , ,
g. Trojan dropper. - , downloader', droper' , "" dropeer'. dropper' downloader'
h. Trojan proxy. ,
i. Trojan criptor.
j. Trojan blocker. ( )
4. Spyware.
