Troj/RaHack-A

Aliases	Backdoor.Win32.Agent.go W32/RAHack virus BKDR_RASBA.B
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
Protection available since	17 February 2005 13:31:39 (GMT)
Detected by	All Sophos products

Free virus scan
Download the Threat Detection Test

Troj/RaHack-A will copy itself into %windows%\system32 folder under the name mscolsrv.exe and svchsot.exe. It will also drop the following files:

%Start Menu%\Programs\Startup\system.vbs
%windows%\system32\server.dll
%windows%\system32\syshid.exe (detected as Troj/Agent-BQ)

It will attempt to autostart itself by setting the following registry entries:

HKLM\Software\Microsoft\Windows\CurrentVersion\Run\sysser
HKCR\exefile\Shell\open\command\
@ = syshid.exe \"%1\" %*\"

And create a service in the name "MSCoolServ".

System.vbs is responsible for start the COM serers for "ComDll.1", for which registry entries could be found in:

HKCR\ComDll.1\
HKCR\ComDll.1\CLSID\(default) = %clsid%
HKCR\CLSID\%clsid%\
HKCR\CLSID\%clsid%\TypeLib\(default) = %typelibid%
HKCR\CLSID\%typelibid%\

Get reports about the latest virus and spyware threats delivered to your computer