1. Symantec/
  2. Security Response/
  3. Backdoor.Dister


Risk Level 1: Very Low

November 10, 2003
February 13, 2007 12:13:42 PM
Also Known As:
Trojan.Win32.DiskMaster.e [Kas, Nanif [McAfee], Win32.Dister.A [Computer Assoc, BKDR_DISTER.A [Trend]
Trojan Horse
Systems Affected:

Backdoor.Dister is a Trojan horse that periodically contacts a server for instructions and configuration data, and then sends batches of email as the server instructs. This functionality could be used to anonymously distribute malware or spam from an infected computer. This Trojan may be found as a file named Diskserv.exe.

Antivirus Protection Dates

  • Initial Rapid Release version November 11, 2003
  • Latest Rapid Release version March 23, 2017 revision 037
  • Initial Daily Certified version November 11, 2003
  • Latest Daily Certified version March 23, 2017 revision 041
  • Initial Weekly Certified release date November 12, 2003
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.
Writeup By: Heather Shannon

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