1. Symantec/
  2. Security Response/
  3. W32.Netsky.C@mm


Risk Level 2: Low

February 24, 2004
February 13, 2007 12:18:01 PM
Also Known As:
W32/Netsky.c@MM [McAfee], Win32.Netsky.C [Computer Assoc, W32/Netsky-C [Sophos], WORM_NETSKY.C [Trend], I-Worm.Moodown.c [Kaspersky], I-Worm.NetSky.c [Kaspersky], W32/Netsky.C.worm [Panda]
Systems Affected:
Windows 2000, Windows 95, Windows 98, Windows Me, Windows NT, Windows Server 2003, Windows XP

W32.Netsky.C is a mass-mailing worm that uses its own SMTP engine to send itself to the email addresses it finds when scanning hard drives and mapped drives. This worm also searches drives C through Y for the folder names containing "Shar" and then copies itself to those folders.

The Subject, Body, and email attachment vary.

  • Symantec Consumer products that support Worm Blocking functionality automatically detect this threat as it attempts to spread.
  • Rapid Release virus definitions, version 2/24/04 rev 32 (60224af or 20040224.032) and greater, detect this threat.

Symantec Security Response has received an additional W32.Netsky.C@mm sample which is ASPacked. Response has seen no customer submissions of this minor variant at this time. Virus definitions of version 2/25/2004 rev 19 (60225s) (20040225.019) or greater are required to detect this variation.

Antivirus Protection Dates

  • Initial Rapid Release version February 25, 2004
  • Latest Rapid Release version February 25, 2004
  • Initial Daily Certified version February 25, 2004
  • Latest Daily Certified version February 25, 2004
  • Initial Weekly Certified release date February 25, 2004
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.
Writeup By: Tony Lee

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