Technorati
Digg
Delicious
Reddit
StumbleUpon
Facebook
Yahoo
Twitter
Faves
Newsvine
- Discovered:
- July 27, 2003
- Updated:
- February 13, 2007 12:03:03 PM
- Type:
- Worm
- Systems Affected:
- Windows 2000, Windows 95, Windows 98, Windows Me, Windows NT, Windows XP
W32.Lorsis.Worm is a worm that spreads through the KaZaA file-sharing network. If this worm is executed in February, or from December 6 to 31, it deletes critical system files.
The worm uses several different filenames ending with " .exe" (there are 15 spaces before the .exe extension); see the "Technical Details" section for a complete list.
During execution, the worm repeatedly attempts to copy itself to the A: drive, resulting in noticeable noise from the floppy drive, if one is installed.
W32.Lorsis.Worm is written in Visual Basic and is compressed with Aspack and UPX.
Antivirus Protection Dates
- Initial Rapid Release version July 28, 2003
- Latest Rapid Release version September 28, 2010 revision 054
- Initial Daily Certified version July 28, 2003
- Latest Daily Certified version September 28, 2010 revision 036
- Initial Weekly Certified release date July 30, 2003
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.
Threat Assessment
Wild
- Wild Level: Low
- Number of Infections: 0 - 49
- Number of Sites: 0 - 2
- Geographical Distribution: Low
- Threat Containment: Easy
- Removal: Moderate
Damage
- Damage Level: High
Distribution
- Distribution Level: Medium
Writeup By: Heather Shannon
