Windows 2003/XP/2000/NT/ME/98/95

Kolabc.BP is a Trojan, which although seemingly inoffensive, can actually carry out attacks and intrusions.

It affects productivity, preventing tasks from being carried out:

• In the affected computer: it converts the computer into a platform for taking malicious action surreptitiously: spam sending, launch of Denial of Service attacks, malware distribution, etc.

It reduces the security level of the computer: it terminates processes belonging to security tools, such as antivirus programs and firewalls, leaving the computer defenseless against attacks from other malware; it listens on open ports in order to control the computer remotely; it awaits remote-control orders received through IRC or FTP; it changes system permissions, decreasing the security level.

It uses stealth techniques to avoid being detected by the user:

• It uses techniques included in its code to hide itself while it is active.
• It terminates processes corresponding to several security tools, such as antivirus programs and firewalls, to prevent detection.
• It deletes the original file from which it was run once it is installed on the computer.

It uses several methods in order to avoid detection by antivirus companies:

• It terminates its own execution if it detects that a debugging program is active.

Kolabc.BP uses the following propagation or distribution methods:

• Exploiting vulnerabilities with the intervention of the user: exploiting vulnerabilities in file formats or applications. To exploit them successfully it needs the intervention of the user: opening files, viewing malicious web pages, reading emails, etc.
• IRC: It sends a copy of itself to all users connected to the channel to which the infected user is connected.
• Instant messaging: it sends links pointing to a copy of itself to all users included in the infected user's contacts list.
• Computer networks (shared resources): it creates copies of itself in shared network resources to which it has access.