Threat Description

Fantibag.B

Details

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

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 action

Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.

More scanning & removal options

More information on scanning or removal options is available in the documentation for your F-Secure security product on the Downloads section of our Home - Global site.

You may also refer to the Knowledge Base on the F-Secure Community site for more information.

Contact Support

For further assistance, F-Secure customers can request support online via the Request support or the Chat forms on our Home - Global site.



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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