Threat Description

Backdoor:​W32/IRCBot.BNS

Details

Aliases:Backdoor:​W32/IRCBot.BNS
Category:Malware
Type:Backdoor
Platform:W32

Summary



IRCBot represents a large family of backdoors - remote access tools used by hackers.



Removal


Automatic action

Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.

More

You may wish to refer to the Support Community for further assistance. You also may also refer to General Removal Instructions for a general guide on alternative disinfection actions.



Technical Details



These tools allow for the control of a victim's computer remotely by sending specific commands via IRC channels. Also, these backdoors can steal data and spread to computers vulnerable to exploits.

The backdoor's file is a PE executable about 1.3 megabytes long, packed with Themida file compressor.

When the backdoor's file is started, it copies itself as a file named winupdate.exe to the Windows System folder and then creates the following startup key value in the Registry:

  • [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] "winupdate" = "winupdate.exe"

When the backdoor is active, it connects to an IRC server, joins a certain channel, and acts as a bot there.

The following IRC server and ports is used by the backdoor:

  • 72.20.15.41:6667

The backdoor joins the following password-protected IRC channel:

  • #~>|EBoT|<~

A hacker can send commands to the bots to control infected computers. Several tasks can be performed, including the following:

  • Start FTP server
  • Perform ping, SYN, ICMP and UDP flooding
  • Get system information including OS, network and drives
  • Update the backdoor's software
  • Operate the backdoor's bot (nick change, join channels et cetera)
  • Redirect traffic (proxy)
  • Steal CD keys for popular games
  • Download and execute files
  • Log keystrokes
  • Scan and exploit computers vulnerable to exploits

When spreading, the bot can exploit the following vulnerabilities:

  • Weak Windows share passwords
  • Weak VNC passwords port 5900
  • ASN.1 (MS04-007) ports 80, 139, 445
  • WKSSVC (MS03-049) port 135
  • Symantec Antivirus and Client Security vulnerability ports 2967, 2968





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