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

Bagle.KZ 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 terminates processes belonging to security tools, such as antivirus programs and firewalls, leaving the computer defenseless against attacks from other malware.

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

Bagle.KZ 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.
• Computer networks (mapped drives): it creates copies of itself in mapped drives.