Backdoor:W32/IRCBot.DDR

Threat description

Details

CATEGORYMalware
TYPEBackdoor

Summary

A Bot, sometimes referred to as Zombie, is a computer that has been infected with malware that allows a remote malicious user access to the computer. This Bot attempts to spread via MSN Messenger.



Removal

Automatic action

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

More scanning & removal options

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You may also refer to the Knowledge Base on the F-Secure Community site for more information.

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Technical Details

Upon execution this malware drops a copy of itself in the following directory:

  • %windir%\livemessenger.com

Note: %windir% is typically C:\Windows

It also displays the following:

There is no picture, the message is false and is used as a decoy.

It creates an autostart function by adding the following registry keys:

  • HKLM\Software\Microsoft\Windows\CurrentVersion\Run Microsoft Update = livemessenger.com
  • HKLM\Software\Microsoft\Windows\CurrentVersion\RunOnce Microsoft Update = livemessenger.com
  • HKLM\Software\Microsoft\Windows\CurrentVersion\RunOnceEx Microsoft Update = livemessenger.com

It disable the Task Manager and the Registry Editor by setting the following:

  • HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System DisableTaskMgr = 00000001 DisableRegistrytools = 00000001

This backdoor has keylogging capabilities and saves all the data to the following location:

  • %windir%\admintxt.txt.

Like many other typical Bots, it connects to a server on port 1863 and waits for a command from a remote hacker.

IRCBot attempts to connect to the following site:

  • http://msg.sig-clan.com

This Bot has the following commands:

  • Download and execute files
  • Get the Bot's up-time
  • Join/Quit IRC channel
  • Key-logging
  • Kill processes
  • Send private message on IRC
  • Spread the Bot via MSN messenger
  • Update the Bot

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