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Danger level 7
Type: Trojans
Common infection symptoms:
  • Connects to the internet without permission
  • Installs itself without permissions
  • Normal system programs crash immediatelly
  • Slow Computer
  • Slow internet connection
  • System crashes


Trojan.Tooso is a rather old Trojan infection that was first discovered back in 2005. It affects various Windows systems, including Windows 2000, Windows XP, Windows Server 2003 and so on. Once Trojan.Tooso gets into the target system it modifies two registry subkeys in order for the Trojan to start automatically together with Windows. It also injects a wiwshost.exe code into explorer.exe, so even though in Task Manager it might seem as though explorer.exe is still running, the truth is that everything is performed by wiwshost.exe.

Then Trojan.Tooso tries to delete various registry entries related to computer security programs to prevent them from running and consequently to save itself from being removed. The is one of the basic functions of Trojan.Tooso - this Trojan has been created to interfere with the security software operations. It can easily delete files and lower down the security level of your computer. Thus it can be deduced that Trojan.Tooso is a constituent part of other Trojan infections and it sort of "prepares" your computer for other malicious programs.

Although there is no exact way to tell when or how Trojan.Tooso gets into your system, but it would be for the best if you performed regular system scans with a powerful antimalware program. This way you would prevent Trojan.Tooso from spreading and ruining your system. If you are infected, however, you should remove Trojan.Tooso immediately. You can delete it on your own, by erasing all the files and registry keys related to the Trojan, or you can always resort to using a computer security software. Automatic removal is especially recommended for those users who are not used to working with the Registry Editor.

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How to manually remove Trojan.Tooso

Files associated with Trojan.Tooso infection:


Trojan.Tooso processes to kill:


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