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

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

It captures certain information entered or saved by the user, with the corresponding threat to privacy: email addresses.

It affects productivity, preventing tasks from being carried out:

• In the affected computer: causes system slowdowns.

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

It reduces the security level of the computer: it listens on open ports in order to control the computer remotely; it awaits remote-control orders received through IRC.

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.

Bagle.JZ 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.