Threat Descriptions

Backdoor:W32/VanBot.BR

Classification

Category :

Malware

Type :

Backdoor

Platform :

W32

Aliases :

Backdoor:W32/VanBot.BR

Summary

VanBot.BR is a family of IRC bot-based backdoors that can be commanded to copy itself to remote computers with the help of known exploits.

Removal

Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.

A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:

  • Check for the latest database updates

    First check if your F-Secure security program is using the latest updates, then try scanning the file again.

  • Submit a sample

    After checking, if you still believe the file is incorrectly detected, you can submit a sample of it for re-analysis.

    Note: If the file was moved to quarantine, you need to collect the file from quarantine before you can submit it.

  • Exclude a file from further scanning

    If you are certain that the file is safe and want to continue using it, you can exclude it from further scanning by the F-Secure security product.

    Note: You need administrative rights to change the settings.

Technical Details

VanBot.BR is a family of IRC bot-based backdoors that can be commanded to copy itself to remote computers with the help of known exploits. When it arrives on an infected computer it copies itself to the Windows System folder with the name of runapidll.exe and creates several startup strings in the Registry:

  • HKLM\Software\Microsoft\Windows\CurrentVersion\Run Microsoft Dll = runapidll.exe
  • HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices Microsoft Dll = runapidll.exe

It creates the following mutex while running and active in memory:

  • rx-asn-2-re-worked

Once active, the backdoor connects to IRC servers and joins a particular IRC channel to listen for remote commands from the attacker.As common with IRC-based bots, VanBot.BR can do any of the following:

  • Create remote command shell
  • Delete files
  • Download and run files
  • Gather infected system information
  • Join and part IRC channels, change nicks, change server
  • List and terminate processes including security related software products
  • Log keystrokes
  • Monitor and sniff network traffic
  • Open a mail proxy, http and tftp server for file transfers
  • Perform DDOS and send ICMP and SYN packets
  • Report bot uptime to a hacker
  • Save a screen and webcam image capture
  • Scan for vulnerable computers and try to get access to IPC$ and ADMIN$ shares by performing a dictionary attack then spread to them
  • Send current IP address to a hacker
  • Steal user credentials and PC games private keys
  • Visit a remote website