W32.HLLP.Lassa

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Discovered:: July 14, 2002
Updated:: February 13, 2007 11:40:02 AM
Also Known As:: Win32.HLLP.Lassa.40960[AVP], W32/Lassa.a[McAfee], Win32.Lassie.A[CA], W32/Lassa-A[Sophos]
Type:: Virus
Systems Affected:: Windows 2000, Windows 95, Windows 98, Windows Me, Windows NT, Windows XP

W32.HLLP.Lassa is written in Visual Basic. It prepends itself to host files and appends randomly chosen bytes to the end of the host files. It may also overwrite the host file with the pure viral code.

Antivirus Protection Dates

Initial Rapid Release version July 15, 2002
Latest Rapid Release version September 28, 2010 revision 054
Initial Daily Certified version July 15, 2002
Latest Daily Certified version September 28, 2010 revision 036
Initial Weekly Certified release date July 17, 2002

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

Writeup By: Yana Liu

Technical Details

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Internet Security Threat Report, Volume 16