1. Symantec/
  2. Security Response/
  3. W32.Jonbarr@mm


September 12, 2002
February 13, 2007 11:40:31 AM
Also Known As:
Worm.Pepex [AVP], W32/Pepex.a@MM [McAfee], WORM_PEPEX.A [Trend]
Systems Affected:

W32.Jonbarr@mm is a mass-mailing worm that is written in the Microsoft C/C++ programming language and compressed with UPX . It uses its own SMTP engine to send itself to all email addresses that it finds in .htm files and in temporary Internet files. The worm also spreads using the mIRC and KaZaA file-sharing network. The email message has the following characteristics:

Internet Explorer vulnerability patch
Message: You will find all you need in the attachment.
Attachment: Setup.exe 

Antivirus Protection Dates

  • Initial Rapid Release version September 13, 2002
  • Latest Rapid Release version August 8, 2016 revision 023
  • Initial Daily Certified version September 13, 2002
  • Latest Daily Certified version August 9, 2016 revision 001
  • Initial Weekly Certified release date September 18, 2002
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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