Troj/ConHook-B

Please follow the instructions for removing Trojans.

Windows 2000

You will first need to prevent use of the following registry entry, if it is present. Please read the warning about editing the registry.

• At the taskbar, click Start|Run. Type 'REGEDT32' and press Return. The registry editor opens.
• Before you edit the registry, you should make a backup. Select the 'HKEY_LOCAL_MACHINE on local machine' window. Select 'HKEY_LOCAL_MACHINE'. On the 'Registry' menu, click 'Save Subtree As'. Save the registry subtree as Backup.
• Select SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify
• Select \<Trojan_entry>
• On the Security menu select 'Permissions'
• In 'Permissions for...' deselect 'Allow inheritable permissions from parent to propagate to this object'
• In the Security dialog, click 'Remove'
• Click 'OK'
• Click 'Yes' to deny everyone access to the key
• Close the registry editor.

Follow the Safe Mode with Command Prompt instructions for removing Trojans.

Re-open the registry editor to delete the Trojan registry entries.

• At the taskbar, click Start|Run. Type 'REGEDT32' and press Return. The registry editor opens.
• Select SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify
• Select \<Trojan_entry>
• On the Security menu select 'Permissions'
• In 'Permissions for...' select 'Allow inheritable permissions from parent to propagate to this object'
• Click 'OK'
• On the Edit menu select 'Delete'
• Click 'Yes' to delete the key
• Close the registry editor.

Windows XP/2003

You will first need to prevent use of the following registry entry, if it is present. Please read the warning about editing the registry.

• At the taskbar, click Start|Run. Type 'Regedit' and press Return. The registry editor opens.
• Before you edit the registry, you should make a backup. Select 'My Computer'. On the 'File' menu, click 'Export'. Save your registry as Backup.
• Select HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify
• Right-click '<Trojan_entry>'
• Select 'Permissions'
• In the 'Permissions for...' dialog, click 'Advanced'
• In the 'Advanced Security Settings for...' dialog, deselect 'Inherit from parent the permission entries that apply to child objects.'
• In the Security dialog, click 'Remove'
• Click 'OK'
• Click 'Yes' to deny everyone access to the key
• Click 'OK'
• Close the registry editor.

Follow the Safe Mode with Command Prompt instructions for removing Trojans.

Re-open the registry editor to delete the Trojan registry entries.

• At the taskbar, click Start|Run. Type 'Regedit' and press Return. The registry editor opens.
• Select HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify
• Right-click '<Trojan_entry>'
• Select 'Permissions'
• In the 'Permissions for...' dialog, click 'Advanced'
• In the 'Advanced Security Settings for...' dialog, select 'Inherit from parent the permission entries that apply to child objects.'
• Click 'OK' twice
• Right-click '<Trojan_entry>'
• Select 'Delete'
• Click 'Yes' to delete the key
• Close the registry editor.

Troj/ConHook-B is a Trojan for the Windows platform.

The Trojan attempts to download and run further malicious code without the user's knowledge.

Troj/ConHook-B drops the component REQ.DLL in the Windows system folder.

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

HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\req\
DllName =
<system>\req.dll

HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\req\
Impersonate =
0

The dropped file req.dll is registered as a COM object and Browser Helper Object (BHO) for Microsoft Internet Explorer, creating registry entries under:

HKCR\CLSID\[1C044AAD-7955-4CBD-8175-501A165C4E5D]

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects\[1C044AAD-7955-4CBD-8175-501A165C4E5D]