It ends processes belonging to antivirus programs and firewalls, which leaves the affected computer vulnerable to the attack of other malware. It spreads via e-mail and through P2P programs.

Windows 2003/XP/2000/NT

Bagle.BL is a worm that affects Windows XP/2000/NT computers only, and its expiration date is April 25, 2006. After this date, the worm will automatically stop its execution when it activates.

Bagle.BL ends processes belonging to antivirus programs and firewalls, among others. This leaves the affected computer vulnerable to the attack of other malware.

It also deletes the entries in the Windows Registry belonging to several variants of the worm Netsky.

Bagle.BL spreads via e-mail in a message with variable characteristics and through peer-to-peer (P2P) file sharing programs.

Bagle.BL is difficult to recognize, as it does not display any messages or warnings that indicate it has reached the computer.