Troj/Ragruk-A

Category	Viruses and Spyware
Type	Trojan
What to do	If you've received an alert for a virus or spyware, then follow the instructions for removing the threat.
Prevalence	low high

Summary


Affected operating systems	Windows
Characteristics	Installs itself in the registry
Included in our products from	June 2006 (4.06)
Protection available since	6 May 2006 14:44:48 (GMT)
Detected by	All Sophos products

Troj/Ragruk-A is a backdoor Trojan which allows a remote intruder to gain
access and control over the computer.

Troj/Ragruk-A may attempt to terminate various security related programs.

When first run Troj/Ragruk-A copies itself to <Windows>\svchst.exe and creates
the following files:

<Temp>\run.log
\at.bat

These files can be deleted.

The following registry entry is created to run svchst.exe on startup:

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
Antivir
<Windows>\svchst.exe

The following registry entry is set, disabling the Windows task manager
(taskmgr):

HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System
DisableTaskMgr
1

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