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

Mytob.OQ is a worm that spreads by copying itself, without infecting other files.

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 awaits remote-control orders received through IRC or FTP.

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.
• It deletes the original file from which it was run once it is installed on the computer.

Mytob.OQ 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.
• Email: sending emails that include a copy of itself as an attachment. The computer is infected when the attachment is run.