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Threat LevelModerate threatDamageHighDistributionNot widespread
Common name:QHost.IP
Technical name:Trj/QHost.IP
Threat level:Low
Effects:   It allows to get into the affected computer. It changes the security settings of Internet Explorer. It spreads , across the Internet.
Affected platforms:

Windows 2003/XP/2000/NT/ME/98/95/3.X

First detected on:July 7, 2008
Detection updated on:May 10, 2010

Brief Description 


QHost.IP is a Trojan, which although seemingly inoffensive, can actually carry out attacks and intrusions.


It reduces the security level of the computer: it changes the security settings of Internet Explorer, decreasing its security level.


QHost.IP prevents access from programs to websites of several companies related with security tools (antivirus programs, firewalls, etc.).


QHost.IP uses the following propagation or distribution methods:

  • Exploiting vulnerabilities with the intervention of the user: exploiting vulnerabilities in file formats or applications. To exploit them successfully it needs the intervention of the user: opening files, viewing malicious web pages, reading emails, etc.
  • Via Internet, exploiting remote vulnerabilities: attacking random IP addresses, in which it tries to insert a copy of itself by exploiting one or more vulnerabilities.


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