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

Oscarbot.XB is a worm that spreads by copying itself, without infecting other files.

It reduces the security level of the computer: it awaits remote-control orders received through IRC.

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

• It injects itself in running processes.
• 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 it is being executed in a virtual machine environment, such as VMWare or VirtualPC.

Oscarbot.XB 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.