Alias:I-Worm.Lentin.f
Type:Worm 
Size:29.839 Bytes 
Origin: 
Date:06-19-2002 
Damage:Sent by email. 
VDF Version:6.23.00.00 
Danger:Medium 
Distribution:Medium 

DistributionWorm/Yaha.E is a mass mailer, which sends itself by email to addresses collected from the local * .HT* files, Windows Address Book , MSN Messenger, ICQ and Yahoo Messenger. The attachment of the email has the extension .BAT, .PIF or .SCR.
The subject, body and attachment can have different appearance. The name of the attachment, for example, can be composed of the following parts:
First part:
• loveletter
• resume
• love
• weeklyreport
• goldfish
• report
• mountan
• biodata
• dailyreport
• lovegreetings
• shakingfriendship
then the first extension:
• .wav
• .doc
• .mp3
• .bmp
• .jpg
• .gif
• .txt
• .xls
• .htm
• .mpg
• .zip
• .dat
and the second extension:
• .pif
• .bat
• .scr



Technical DetailsWhen the attachment is opened, W32/Yaha.E copies itself in the hidden C:\Recycled\ with a random name. Another copy, but of .TXT type, will be placed in Windows. It has the following lines:
<<<>>> <<<>>> <<<>>> <<<>>> <<<>>> <<<>>> <<<>>>
iNDian sNakes pResents yAha.E

iNDian hACkers,Vxers c0me & w0Rk wITh uS & f*Ck tHE GFORCE-pAK shites

bY

sNAkeeYes,c0Bra
<<>>> <<<>>> <<<>>> <<<>>> <<<>>> <<<>>> <<<>>>
W32/Yaha.E makes the following registry entry, to ensure that it will be activated by the next system start:
[HKEY_CLASSES_ROOT\exefile\shell\open\command]
@="\"c:\\recycled\\<RANDOM NAME>\" %1 %*"
With this entry, W32/Yaha.E is strated whenever an .EXE file is opened.
If one of the following applications is active, W32/Yaha.E will try to terminate it:
• SCAM32
• SIRC32
• WINK
• ZONEALARM
• AVP32
• LOCKDOWN2000
• AVP.EXE
• CFINET32
• CFINET
• ICMON
• SAFEWEB
• WEBSCANX
• ANTIVIR
• MCAFEE
• NORTON
• NVC95
• FP-WIN
• IOMON98
• PCCWIN98
• F-PROT95
• F-STOPW
• PVIEW95
• NAVWNT
• NAVRUNR
• NAVLU32
• NAVAPSVC
• NISUM
• SYMPROXYSVC
• RESCUE32
• NISSERV
• ATRACK
• IAMAPP
• LUCOMSERVER
• LUALL
• NMAIN
• NAVW32
• NAVAPW32
• VSSTAT
• VSHWIN32
• AVSYNMGR
• AVCONSOL
• WEBTRAP
• POP3TRAP
• PCCMAIN
• PCCIOMON

After the infection succeeded, W32/Yaha.E will generally apply its “Background”.
Description insérée par Crony Walker le mardi 15 juin 2004

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