Threat Description

Bobic.k

Details

Aliases: Bobic.k, Net-Worm.Win32.Bobic.k
Category: Malware
Type: Worm
Platform: W32

Summary



Bobic (also known as Bobax) is an e-mail and network worm. It spreads in e-mail messages and can also use different exploits to spread from computer to computer via Internet. However this variant doesn't have any exploits and it spreads only by e-mail.



Removal



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For more general information on disinfection, please see Removal Instructions.



Technical Details



When run, the worm's file drops a DLL component to temporary folder and injects it into Windows Explorer process.

Spreading in E-mails

The worm collects victims' e-mail addresses before spreading. It scans Windows Address Book file and files with the following extensions:

.htm
 .txt
 .dbx


The worm ignores e-mail addresses that have any of the following substrings in them:

ogle
 help
 admi
 ter@
 micr
 supp
 yman
 viru
 tren
 secu
 .mil
 urhq
 pand
 afee
 soph
 kasp
 .gov
 nort


The worm spreads in e-mail messages. It can use the following text strings in the Subject field:

Saddam Hussein - Attempted Escape, Shot dead
 Attached some pics that i found
 Osama Bin Laden Captured.
 Attached some pics that i found
 Testing
 Secret!


The following text strings are used to create message body of an infected e-mail:

Hey,
 Remember this?
 Hello,
 Long time! Check this out!
 Hey,
 I was going through my album, and look what I found..
 Hey,
 Check this out :-)


The worm can also append the following strings to the message to persuade a user that the message was scanned by an anti-virus and no infection was detected:

+++ Attachment: No Virus found
 +++ Panda AntiVirus - You are protected
 +++ www.pandasoftware.com
 +++ Attachment: No Virus found
 +++ Norman AntiVirus - You are protected
 +++ www.norman.com
 +++ Attachment: No Virus found
 +++ F-Secure AntiVirus - You are protected
 +++ www.f-secure.com
 +++ Attachment: No Virus found
 +++ Norton AntiVirus - You are protected
 +++ www.symantec.com


The infected attachment names can be any of the following:

Cool
 pics
 funny
 bush
 joke
 secret


Extensions of an infected attachment can be:

.pif
 .scr
 .exe
 .pif
 .zip


A remote system becomes infected when a recipient opens the worm's attachment.

Payload

The worm disables Windows firewall and also disables shared access. It changes several security-related settings in the Registry. The worm disables process manupulation and termination in Task Manager.

Bobic.k worm can modify Windows HOSTS file to block access to the following sites:

255.255.255.255
 ar.atwola.com
 atdmt.com
 avp.ch
 avp.com
 avp.ru
 awaps.net
 ca.com
 dispatch.mcafee.com
 download.mcafee.com
 download.microsoft.com
 downloads.microsoft.com
 engine.awaps.net
 f-secure.com
 ftp.f-secure.com
 ftp.sophos.com
 go.microsoft.com
 liveupdate.symantec.com
 mast.mcafee.com
 mcafee.com
 msdn.microsoft.com
 my-etrust.com
 nai.com
 networkassociates.com
 office.microsoft.com
 phx.corporate-ir.net
 secure.nai.com
 securityresponse.symantec.com
 service1.symantec.com
 sophos.com
 spd.atdmt.com
 support.microsoft.com
 symantec.com
 update.symantec.com
 updates.symantec.com
 us.mcafee.com
 vil.nai.com
 viruslist.ru
 windowsupdate.microsoft.com
 www.avp.ch
 www.avp.com
 www.avp.ru
 www.awaps.net
 www.ca.com
 www.f-secure.com
 www.kaspersky.ru
 www.mcafee.com
 www.my-etrust.com
 www.nai.com
 www.networkassociates.com
 www.sophos.com
 www.symantec.com
 www.trendmicro.com
 www.viruslist.com
 www.viruslist.ru
 www3.ca.com


The worm can also download 3 files from Internet. These files are not malicious.





Technical Details: Alexey Podrezov, September 15th, 2005


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