Backdoor:W32/IRCBot.ES

Classification

Malware

Backdoor

W32

Backdoor.Win32.IRCBot.es

Summary

A remote administration utility that bypasses normal security mechanisms to secretly control a program, computer or network.

Removal

Automatic action

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.

Special Removal Tool

F-Secure provides a special disinfection utility program to eliminate this malware infection. You can download this utility from our ftp or web sites:

  • ftp://ftp.f-secure.com/anti-virus/tools/f-bot.zip
  • http://www.f-secure.com/tools/f-bot.exe
  • ftp://ftp.f-secure.com/anti-virus/tools/f-bot.exe

Disinfection instructions can be found here:

  • ftp://ftp.f-secure.com/anti-virus/tools/f-bot.txt

Suspect a file is incorrectly detected (a False Positive)?

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 detection database 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.

Find out more

Knowledge Base

Find the latest advice in our Community Knowledge Base.

User Guide

See the user guide for your 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

Backdoor:W32/IRCBot.EX provides unauthorised access to an infected computer and also has the capability to spread to remote computers using the PnP exploit on port 445.

The backdoor's file is a PE executable file about 8 kilobytes long, packed with MEW file compressor and patched with PE_Patch.

This IRC-based backdoor-worm was found on August 15th, 2005 in Finland.

Propagation

The backdoor has the ability to spread to remote computers using the PnP exploit on port 445. Please see the following page for detailed information on the vulnerability:

  • http://www.microsoft.com/technet/security/Bulletin/MS05-039.mspx

Installation

When the backdoor's file is activated on a computer, it copies its file to Windows System folder as MOUSEBM.EXE and then starts the copied file as a service named 'Mouse Button Monitor', described as follows: Enables a computer to maintain synchronization with a PS/2 pointing device. Stopping or disabling this service will result in system instability.

If the backdoor fails to start its service, it tries to inject its code into Explorer.exe process.

Backdoor

When active, the backdoor connects to one of the following servers on port 18067:

  • esxt.is-a-fag.net
  • esxt.legi0n.net

Then backdoor joins an IRC channel called '#p2' using the hardcoded password and creates a bot there. A remote hacker can control a backdoor via a bot that it creates in the '#p2' channel. A hacker can do any of the following:

  • Scan for vulnerable computers and spread to them using PnP exploit
  • Download and run files on an infected computer
  • Find files on local hard disks
  • Perform DDoS (Distributed Denial of Service) attack
  • Perform SYN and UDP flood