Threat Descriptions

Backdoor:W32/IRCBot.BNS

Classification

Category :

Malware

Type :

Backdoor

Platform :

W32

Aliases :

Backdoor:W32/IRCBot.BNS

Summary

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

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

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