W32.Nolor@mm

Risk Level 2: Low

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Discovered:: April 28, 2003
Updated:: February 13, 2007 12:00:37 PM
Also Known As:: W32/Lovelorn@MM [McAfee], WORM_LOVELORN.A [Trend], Win32.Lovelorn.A [CA], I-Worm.Lovelorn [KAV], W32/Cailont-A [Sophos]
Type:: Worm, Virus
Systems Affected:: Windows 2000, Windows 95, Windows 98, Windows Me, Windows NT, Windows XP

W32.Nolor@mm is a mass-mailing worm that uses its own SMTP engine to spread itself. The email will have a variable subject line and an attachment with the filename, *.Kiss.ok.exe or *.htm.

W32.Nolor@mm is also a file infector that encrypts the host file, and then prepends itself to the host file.

This threat is written in the Borland C++ programming language.

Antivirus Protection Dates

Initial Rapid Release version April 28, 2003
Latest Rapid Release version March 1, 2011 revision 018
Initial Daily Certified version April 28, 2003
Latest Daily Certified version March 1, 2011 revision 020
Initial Weekly Certified release date April 30, 2003

Click for a more detailed description of Rapid Release and Daily Certified virus definitions.

Threat Assessment

Wild

Wild Level: Low
Number of Infections: More than 1000
Number of Sites: More than 10
Geographical Distribution: Medium
Threat Containment: Easy
Removal: Moderate

Damage

Damage Level: Low

Distribution

Distribution Level: High

Writeup By: Kaoru Hayashi

Technical Details

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Internet Security Threat Report, Volume 16