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

Bagle.IN is a worm that spreads by copying itself, without infecting other files.

• In the local network: it generates a large amount of network activity and consumes bandwidth.

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

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 injects itself in running processes.

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

• Its code is encrypted and it is only decrypted when it is going to run. Because of this, its code is not legible through a memory dump.

Bagle.IN 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.