Home > Threat descriptions >

Fantibag.B

Classification

Category: Malware

Type: Worm

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

Based on the settings of your F-Secure security product, it will either automatically delete, quarantine or rename the detected program or file, or ask you for a desired action.

Knowledge Base

Find the latest advice in our Community Knowledge Base.

About the product

See the manual for your F-Secure product on the Help Center.

Contact Support

Chat with or call an expert for help.

Submit a sample

Submit a file or URL for further analysis.

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