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

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

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

• It terminates processes corresponding to several security tools, such as antivirus programs and firewalls, to prevent detection.

Cycler.B 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.
• Via Internet, exploiting remote vulnerabilities: attacking random IP addresses, in which it tries to insert a copy of itself by exploiting one or more vulnerabilities.