February 24, 2011

Trojan Brisv Infection.


Trojan Brisv is a Trojan horse that infects multimedia files. This trojan search for multimedia files with extension .asf, .mp2, .mp3, .wma, .wmv and injects additional functionality into the multimedia files it finds. While playing these infected multimedia files Windows Media Player will access a malicious link on the internet.



Symptoms of the Virus.




Unknown Brisv processes in Windows task manager, unknown P tower error beep sounds, Corrupt or missing system files, registry keys and dlls files cause "Blue Screen Of Death"
Pop-up blocker incapable to block frustrating porn and gambling related mass pop ups. Brisv re-creates itself after been removed manually, particularly difficult to eliminate, general windows and browser instability, slow system startup and shutdown. 




Prevention of this Virus.

  • Download media files from a trusted website only.
  • Use a firewall to block all incoming connections from the Internet to services that should not be publicly available. By default, you should deny all incoming connections and only allow services you explicitly want to offer to the outside world.
  • Enforce a password policy. Complex passwords make it difficult to crack password files on compromised computers. This helps to prevent or limit damage when a computer is compromised.
  • Ensure that programs and users of the computer use the lowest level of privileges necessary to complete a task. When prompted for a root or UAC password, ensure that the program asking for administration-level access is a legitimate application.
  • Disable AutoPlay to prevent the automatic launching of executable files on network and removable drives, and disconnect the drives when not required. If write access is not required, enable read-only mode if the option is available.Turn off file sharing if not needed. If file sharing is required, use ACLs and password protection to limit access. Disable anonymous access to shared folders. Grant access only to user accounts with strong passwords to folders that must be shared.
  • Configure your email server to block or remove email that contains file attachments that are commonly used to spread threats, such as .vbs, .bat, .exe, .pif and .scr files.
  •  Isolate compromised computers quickly to prevent threats from spreading further. Perform a forensic analysis and restore the computers using trusted media.
Removal of the Infection.
 
Remove the Infected file first( Can be any media file)
Registry Keys to be removed.(Backup the registry, before editing it)
HKEY_CURRENT_USER\Software\Microsoft\PIMSRV

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