Sophos

Troj/Conhook-AG

Category
Type
What to do
Prevalence low high

Summary

 
Affected operating systems Windows
Characteristics
  • Drops more malware
  • Installs itself in the registry
Included in our products from August 2007 (4.20)
Protection available since 14 June 2007 04:35:55 (GMT)
Detected by All Sophos products

Action

More Information

Troj/Conhook-AG is a Trojan for the Windows platform.

When Troj/Conhook-AG is installed the following files are created:

<Temp>\<Random FileName 1>.sys
<System>\<Random FileName 2>.dll
<System>\<Random FileName 3>.exe
<System>\drivers\<Random FileName 3>.sys

The following registry entries are created to run code exported by <Random FileName 2>.dll on startup:

HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\<Random Letters>
DLLName
<Random FileName 2>.dll

HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\<Random Letters>
Impersonate
0

The file <Random FileName 2>.dll is registered as a new service named "<Random Letters>". Registry entries are created under:

HKLM\SYSTEM\CurrentControlSet\Services\<Random Letters>

The file <Random FileName 3>.sys is registered as a new system driver service named "<Random Letters>", with a display name of "Microsoft RPC API Helper". Registry entries are created under:

HKLM\SYSTEM\CurrentControlSet\Services\<Random Letters>

The file <Random FileName 2>.dll is registered as a COM object and Browser Helper Object (BHO) for Microsoft Internet Explorer, creating registry entries under:

HKCR\CLSID\(447E6663-81F1-44AC-90E2-4B106EED6D1D)

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects\
(447E6663-81F1-44AC-90E2-4B106EED6D1D)

Registry entries are set as follows:

HKCR\Ctkfcjfg\CLSID
(default)
(447E6663-81F1-44AC-90E2-4B106EED6D1D)

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\OptimalLayout
File
<System>\drivers\<Random FileName 3>.sys

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