W32.Holar.A@mm

Risk Level 1: Very Low

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Discovered:: July 31, 2002
Updated:: February 13, 2007 11:39:51 AM
Also Known As:: W32/Holar@MM [McAfee], W32/Holar.b@MM [McAfee], WORM_HOLAR.A [Trend], I-Worm.Holar [KAV], W32/Holar-A [Sophos], Win32.Holar [CA]
Type:: Worm
Systems Affected:: Windows 2000, Windows 95, Windows 98, Windows Me, Windows NT, Windows XP
CVE References:: CVE-2001-0154

W32.Holar.A@mm is a mass-mailing worm. It is written in Microsoft Visual Basic (VB) programming language and compressed with UPX.

The worm uses Microsoft Outlook or its own SMTP engine to send itself to all addresses that it finds in the Microsoft Outlook Address Book, .htm, and .html files. The email message contains no message body and has a randomly selected subject line, which is also the attachment name. The attachment has a .pif or .scr extension.

The worm also spreads using MSN Messenger, mIRC, and Network shares.

Antivirus Protection Dates

Initial Rapid Release version July 31, 2002
Latest Rapid Release version September 28, 2010 revision 054
Initial Daily Certified version July 31, 2002
Latest Daily Certified version September 28, 2010 revision 036
Initial Weekly Certified release date July 31, 2002

Click 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: Low

Distribution

Distribution Level: High

Writeup By: Yana Liu

Technical Details

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Internet Security Threat Report, Volume 16