Troj/Bckdr-GIR

Aliases	BackDoor-CVT Trojan-Downloader.Win32.Small.coj
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	May 2006 (4.05)
Protection available since	24 March 2006 09:50:29 (GMT)
Last updated	5 April 2006 09:14:18 (GMT)
Detected by	All Sophos products

Troj/Bckdr-GIR is a Trojan for the Windows platform.

When Troj/Bckdr-GIR is installed the following files are created:

<System>\AdService.bat - can be safely deleted
<System>\AdService.dll - detected as Troj/Bckdr-GIR
<System>\winyvo32.dll - detected as Troj/Bckdr-GIR

Troj/Bckdr-GIR includes functionality to inject code into IEXPLORE.EXE.

The following registry entries are created to run code exported by winyvo32.dll on startup:

HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\winyvo32
DllName
winyvo32.dll

HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\winyvo32
Impersonate
0

HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\winyvo32
Startup
EvtStartup

Registry entries are created under:

HKLM\SOFTWARE\Microsoft\MSSMGR\

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