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  3. Backdoor.ZXShell


Risk Level 1: Very Low

February 23, 2012
March 14, 2014 4:40:38 PM
Infection Length:
Systems Affected:
Windows 2000, Windows 7, Windows 95, Windows 98, Windows Me, Windows NT, Windows Server 2003, Windows Server 2008, Windows Vista, Windows XP
Backdoor.ZXShell is a Trojan horse that may open a back door and steal information from the compromised computer.

Antivirus Protection Dates

  • Initial Rapid Release version February 23, 2012
  • Latest Rapid Release version May 5, 2015 revision 032
  • Initial Daily Certified version February 23, 2012
  • Latest Daily Certified version May 6, 2015 revision 002
  • Initial Weekly Certified release date February 29, 2012
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

Threat Assessment


  • Wild Level: Low
  • Number of Infections: 0 - 49
  • Number of Sites: 0 - 2
  • Geographical Distribution: Low
  • Threat Containment: Easy
  • Removal: Easy


  • Damage Level: Medium
  • Payload: Opens a back door.
  • Releases Confidential Info: Steals information.


  • Distribution Level: Low
Note: On May 14, 2015, modifications will be made to the threat write-ups to streamline the content. The Threat Assessment section will no longer be published as this section is no longer relevant to today's threat landscape. The Risk Level will continue to be the main threat risk assessment indicator.
Writeup By: Paul Mangan

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