1. Symantec/
  2. Security Response/
  3. W32.HLLW.Cydog@mm


Risk Level 2: Low

February 26, 2003
February 13, 2007 11:43:35 AM
Systems Affected:

W32.HLLW.Cydog@mm is a mass-mailing worm that spreads by email. This worm uses Microsoft Outlook to send itself to the contacts in the Outlook Address Book:
  • The email will have a random subject chosen from a predetermined selection.
  • The attachment will have a random file name chosen from a predetermined selection, with a file extension of .exe or .scr.

W32.HLLW.Cydog@mm also attempts to spread using the KaZaA, eDonkey2000, Bearshare, Grokster, and Morpheus file-sharing networks. The worm attempts to terminate the active processes of various antivirus programs and system utilities.

W32.HLLW.Cydog@mm also attempts to delete:
  • Program files that Norton AntiVirus products use
  • Files shared by various Symantec programs, including the virus definition files

W32.HLLW.Cydog@mm is a Visual Basic application that is packed with UPX 1.24.

Antivirus Protection Dates

  • Initial Rapid Release version February 26, 2003
  • Latest Rapid Release version September 28, 2010 revision 054
  • Initial Daily Certified version February 26, 2003
  • Latest Daily Certified version September 28, 2010 revision 036
  • Initial Weekly Certified release date February 26, 2003
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.
Writeup By: Serghei Sevcenco

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