Threat Descriptions

Backdoor:W32/IRCBot.DIG

Classification

Category :

Malware

Type :

Backdoor

Platform :

W32

Aliases :

Backdoor.Win32.IRCBot.dig

Summary

A remote administration tool (RAT) which bypasses normal security mechanisms to secretly control a program, computer or network.

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

This malware may arrive as a file downloaded from a malicious website, or as a message received over an instant messaging application such as MSN messenger, AIM, or AIM Triton.

Execution

Upon execution, the malware will drop a copy of itself into the Windows folder as:

  • %windir%\servicean.exe

It creates an entry in the registry, which allows the malware to start automatically:

  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\ Windows svchost = servicean.exe

It then checks the following processes:

  • svchost.exe
  • explorer.exe
  • hidserv.exe
  • winlogon.exe
  • services.exe
  • crss.exe

The malware will search the process memory for the following strings:

  • RFB 003.008
  • RXBot
  • [MAIN]
  • [SCAN]
  • [FTP]
  • NZM
  • scan.stop
  • NZM/ST
  • scanall
  • YaBot

It will terminate the processes in the process memory if found.

Backdoor

It then immediately attempts to connect to a specific channel on a specific IRC server, which the unauthorized remote user is using to access and control any infected machines.

Once connected to the IRC server, the infected machine is ready to accept and execute commands from the remote user. The remote user can perform a variety of actions such as:

  • Enabling or disabling propagation via MSN Messenger
  • Disabling propagation
  • Enabling or disabling propagation via AIM
  • Enabling or disabling propagation via AIM Triton
  • Reporting uptime of the bot
  • Retrieving running threads (its propagation thread like MSN Thread, Bot Killer Thread)
  • Downloading a file from the bot controller
  • Getting updates from the bot controller
  • Killing other bots
  • Launching a process

Network Connections

Attempts to connect to:

  • IRC SERVER: hub.[...]hacksite.us
  • Channel: ##xxxxxx
  • User: 'Currently Logged User Name' : 'Computer Name'