Troj/Oscor-C

Aliases	Win32.Ginwui.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
Protection available since	23 May 2006 21:17:32 (GMT)
Last updated	25 June 2006 19:51:45 (GMT)
Detected by	All Sophos products

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Troj/Oscor-C is a Trojan for the Windows platform.

Troj/Oscor-C includes functionality to access the internet and communicate with a remote server via HTTP.

When first run Troj/Oscor-C copies itself to <Windows system folder>\temp1 and creates the following files:

<Windows system folder>\zsydll.dll
<Windows system folder>\zsyhide.dll
<Temp>\20060426.bak

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

HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\zsydll
DllName
<Windows system folder>\zsydll.dll

HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\zsydll
Startup
DoStartup

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

The following registry entry is set:

HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Windows
AppInit_DLLs
<Windows system folder>\zsyhide.dll

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