W32.Naco@mm

Risk Level 1: Very Low

Printer Friendly Page|Rate this page

Discovered:: May 19, 2003
Updated:: February 13, 2007 12:01:34 PM
Also Known As:: W32/Naco@MM [McAfee]
Type:: Worm
Systems Affected:: Microsoft IIS, Windows 2000, Windows 95, Windows 98, Windows Me, Windows NT, Windows XP

W32.Naco@mm is a mass-mailing worm written in Visual Basic (VB). The worm can spread via email, peer-to-peer file-sharing applications, such as KaZaA, as well as network shares.

This worm is 29,184 bytes in size. However, it has been packed with a known run-time compression utility, that is, UPX. The size of the unpacked worm is close to 100 KB.

The worm also contains a functionality to run as a Backdoor Trojan Horse. It can also replace HTML files on Microsoft IIS servers.

NOTE: W32.Naco@mm contains many bugs, and therefore, may not work as its author intended.

Antivirus Protection Dates

Initial Rapid Release version May 19, 2003
Latest Rapid Release version September 28, 2010 revision 054
Initial Daily Certified version May 19, 2003
Latest Daily Certified version September 28, 2010 revision 036
Initial Weekly Certified release date May 22, 2003

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: Medium

Distribution

Distribution Level: High

Writeup By: Neal Hindocha

Technical Details

Search Threats

Search by name

Example: W32.Beagle.AG@mm

Internet Security Threat Report, Volume 16