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Virus Information
 
W32.Klez.E
 
Category : Worm
 
Type : File
 
Update Number : 918
 
Description : This worm spreads via e-mails containing random subject and attachment names. The attchment executes automatically, on un-patched outlook e-mail clients, when the e-mail is opened.

The worm activates on the 6th of odd number months and overwrites files

 
Details : The extensions of files which are overwritten are BAK, C, CPP, DOC, HTM, HTML, JPG, MP3, MPEG, MPG, PAS, TXT, WAB and XLS. In some cases the worm backs up the original file before overwriting. The backed up file is usually hidden.

The worm has its own SMTP server to mass mail otself to users from the Windows Address Book.

 
Damage

 
Risk Factor

 

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