Threat Description

Fantibag.B

Details

Aliases: Fantibag.B
Category: Malware
Type: Worm, Email-Worm
Platform: W32

Summary



Fantibag.B is a trojan that installs a packet filter for preventing of downloading the AV companies database updates and security patches. It is related to recent Bagle/Mitglieder trojans.



Removal



Automatic Disinfection

Allow F-Secure Anti-Virus to disinfect the relevant files.

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



Technical Details



System installation

When the trojan's file is executed, it copies itself in the Windows directory with the name 'firewall_anti.exe'. It installs the following registry key to ensure that it will be executed at system startup: [HKLM\Software\Microsoft\Windows\CurrentVersion\Run] "firewall_anti" = "%WinDir%\firewall_anti.exe" The trojan drops a DLL 'firewall_anti.dll' in the Windows direcory and injects this file in the address space of Internet Explorer.

Packet filtering

When the dropped DLL is activated, it modifies the network interface with Microsoft RAS packet filtering API. It adds a filter that blocks access to following AV companies and other security related sites:

  • ftpav.ca.com
  • www.pandasoftware.com
  • pandasoftware.com
  • clamav.net
  • www.clamav.net
  • www.bitdefender.com
  • bitdefender.com
  • ravantivirus.com
  • www.ravantivirus.com
  • drweb.ru
  • www.drweb.com
  • drweb.com
  • antivir.de
  • www.antivir.de
  • 216.200.68.152
  • 212.113.20.69
  • 63.210.193.12
  • 84.53.142.22
  • 84.53.142.6
  • kaspersky.ru
  • grisoft.com
  • www3.ca.com
  • www.viruslist.ru
  • www.viruslist.com
  • www.trendmicro.com
  • www.symantec.com
  • www.sophos.com
  • www.networkassociates.com
  • www.nai.com
  • www.my-etrust.com
  • www.mcafee.com
  • www.kaspersky.ru
  • www.kaspersky.com
  • www.kaspersky-labs.com
  • www.grisoft.com
  • www.fastclick.net
  • www.f-secure.com
  • www.awaps.net
  • www.avp.ru
  • www.avp.com
  • www.avp.ch
  • windowsupdate.microsoft.com
  • viruslist.ru
  • viruslist.com
  • vil.nai.com
  • us.mcafee.com
  • updates5.kaspersky-labs.com
  • updates4.kaspersky-labs.com
  • updates3.kaspersky-labs.com
  • updates2.kaspersky-labs.com
  • updates1.kaspersky-labs.com
  • updates.symantec.com
  • update.symantec.com
  • trendmicro.com
  • symantec.com
  • support.microsoft.com
  • spd.atdmt.com
  • sophos.com
  • service1.symantec.com
  • securityresponse.symantec.com
  • secure.nai.com
  • rads.mcafee.com
  • phx.corporate-ir.net
  • office.microsoft.com
  • networkassociates.com
  • nai.com
  • my-etrust.com
  • msdn.microsoft.com
  • media.fastclick.net
  • mcafee.com
  • mast.mcafee.com
  • liveupdate.symantecliveupdate.com
  • liveupdate.symantec.com
  • kaspersky.com
  • kaspersky-labs.com
  • ids.kaspersky-labs.com
  • go.microsoft.com
  • ftp.sophos.com
  • ftp.kasperskylab.ru
  • ftp.f-secure.com
  • ftp.downloads2.kaspersky-labs.com
  • ftp.avp.ch
  • fastclick.net
  • f-secure.com
  • engine.awaps.net
  • downloads4.kaspersky-labs.com
  • downloads3.kaspersky-labs.com
  • downloads2.kaspersky-labs.com
  • downloads1.kaspersky-labs.com
  • downloads.microsoft.com
  • downloads-us3.kaspersky-labs.com
  • downloads-us2.kaspersky-labs.com
  • downloads-us1.kaspersky-labs.com
  • downloads-eu1.kaspersky-labs.com
  • download.microsoft.com
  • download.mcafee.com
  • dispatch.mcafee.com
  • customer.symantec.com
  • clicks.atdmt.com
  • click.atdmt.com
  • www.ca.com
  • ca.com
  • banners.fastclick.net
  • banner.fastclick.net
  • awaps.net
  • avp.ru
  • avp.com
  • avp.ch
  • atdmt.com
  • ar.atwola.com
  • ads.fastclick.net
  • ad.fastclick.net
  • ad.doubleclick.net





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