Myparty is a virus-worm that spreads via the Internet attached to infected e-mail. The worm itself is a Windows PE EXE file about 30Kb in length (compressed by UPX, 76K decompressed), and it is written in Microsoft Visual C++.

Infected messages appear as follows:

Myparty email

The message.

The worm activates from infected e-mail only when a user double-clicks on the attached file. The worm then installs itself to the system and runs a spreading routine.



While installing, the worm copies itself to: c:\regctrl.exe - under Win9x/ME
c:\recycled\regctrl.exe - under WinNT/2K/XP

and spawns this copy. When the worm's file name is not ".com" (as in the attachment), but rather ".exe" (the worm is re-named), it also opens the Web page "".

The original file (as it was run from an infected e-mail) is moved to the Recycled or Recycler directory with one of the following names: C:\RECYCLER\F-%1-%2-%3
C:\RECYCLED\F-%1-%2-%3, where %1, %2, %3 are randomly selected numbers, for example: F-12158-19044-21300, F-27729-23255-31008. While installing, the worm checks the keyboard layout set, and when there is Russian keyboard support, the worm copies itself to Recycled/Recycler in the same way and exits. This is the same on any date except for 25–29 January 2002.

As a result, the worm works only from 25 until 29 January 2002, and only on machines without Russian keyboard support.


To send infected messages, the worm uses a direct SMTP connection to an e-mail server. To obtain a victim's e-mail addresses, the worm scans WAB files (Windows Address Book) and *.DBX files (Outlook Express).

The worm also sends one e-mail (without an attachment) to "".


Under WinNT/2000/... the worm also creates a new file in a user's auto-run directory: %Userprofile%\Start Menu\Programs\Startup\msstask.exe and writes a backdoor program to there. This backdoor is run by data that are stored in a file at the website "".

Known Variants


This one is a slightly modified 'a' version. The differences are: The attached file name is "".


  • Email-Worm.Myparty.a (Kaspersky Lab)
  • I-Worm.Myparty.a (Kaspersky Lab)
  • Virus: W32/Myparty.eml (McAfee)
  • Virus: W32/Myparty.a@MM (McAfee)
  • W32/MyParty-A (Sophos)
  • W32.Myparty.B (ClamAV)
  • W32/Myparty@MM (Panda)
  • W32/Myparty.A@mm (F-PROT)
  • Worm:Win32/Myparty.A@mm (MS(OneCare))
  • Win32.HLLM.MyParty.1 (Dr. Web)
  • Win32/Myparty.A worm (ESET NOD32)
  • Win32.Generic.5413 (BitDef7)
  • I-Worm.Myparty.a (VirusBuster)
  • Win32:MyParty [Wrm] (AVAST)
  • Email-Worm.Win32.Myparty (Ikarus)
  • I-Worm/MyParty.A (AVG)
  • WORM/MyParty.A (AVIRA)
  • W32.Myparty@mm (NAV)
  • MyParty.A@mm (Norman)
  • Worm.Mail.Myparty.a (Rising)
  • Email-Worm.Win32.Myparty.a [AVP] (F-Secure)
  • WORM_MYPARTY.A (Trend Micro)
  • Email-Worm.Win32.Myparty.A (Sunbelt)
  • I-Worm.Myparty.a (VirusBusterBeta)
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