Troj/Bifrose-HM

Aliases	Backdoor.Win32.Bifrose.hm
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	February 2006 (4.02)
Protection available since	8 December 2005 21:54:13 (GMT)
Detected by	All Sophos products

Troj/Bifrose-HM is a backdoor Trojan for the Windows platform.

Troj/Bifrose-HM may inject code into Explorer.exe, in order to hide from the user and bypass some security applications.

When first run Troj/Bifrose-HM copies itself to <System>\CKOTS.exe

Troj/Bifrose-HM also creates the file <System>\plugin1.dat and the hidden file <System>\SysPr.prx, both of which can be deleted.

The following registry entries are created to run CKOTS.exe on startup:

HKLM\SOFTWARE\Microsoft\Active Setup\Installed Components\(9B71D88C-C598-4935-C5D1-43AA4DB90836)
stubpath
<System>\CKOTS.exe

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
startkey
<System>\CKOTS.exe

HKCU\Software\Microsoft\Windows\CurrentVersion\Run
startkey
<System>\CKOTS.exe

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