1. Symantec/
  2. Security Response/
  3. W32.Mydoom.F@mm


Risk Level 2: Low

February 20, 2004
February 13, 2007 12:17:50 PM
Also Known As:
W32/Mydoom.f@MM [McAfee], WORM_MYDOOM.F [Trend], W32/MyDoom-F [Sophos], I-Worm.Mydoom.f [Kaspersky], Win32.Mydoom.F [Computer Assoc
Systems Affected:

The W32.Mydoom.F@mm worm:
  • Is a mass-mailing worm that opens a backdoor on TCP port 1080
  • Can download and execute arbitrary files
  • Will perform a Denial of Service (DoS) against www.microsoft.com and www.riaa.com, if the computer's local system date is between the 17th and 22nd of any month.
  • Sets up a backdoor in an infected system, by opening TCP port 1080. This could allow an attacker to connect to a computer and use it as a proxy to gain access to its network resources.

The worm arrives as an attachment with the file extension .bat, .com, .cmd, .exe, .pif, .scr, or .zip. The From: line of the email may be spoofed.

Virus definitions released on February 25, 2004 contained an enhanced W32.Mydoom.F@mm detection. This update provides a supplemental detection of zip files in addition to the existing signatures.

Antivirus Protection Dates

  • Initial Rapid Release version February 23, 2004
  • Latest Rapid Release version August 8, 2016 revision 023
  • Initial Daily Certified version February 23, 2004
  • Latest Daily Certified version August 9, 2016 revision 001
  • Initial Weekly Certified release date February 23, 2004
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.
Writeup By: Yana Liu

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STAR Antimalware Protection Technologies
2016 Internet Security Threat Report, Volume 21
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