Arrival Details
This backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
Installation
This backdoor drops and executes the following files:
- %System%\mpeg4c32.dll - detected as BKDR_TENPEQ.OMU
- %System%\tcpipport.sys - detected as RTKT_TENPEQ.OMU
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)
Autostart Technique
This backdoor registers as a system service to ensure its automatic execution at every system startup by adding the following registry keys:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\TCPIPPORT
Type = "1"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\TCPIPPORT
Start = "1"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\TCPIPPORT
ErrorControl = "0"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\TCPIPPORT
ImagePath = \??\C:\WINDOWS\system32\tcpipport.sys
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\TCPIPPORT
DisplayName = "TCPIPPORT"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\BITS
WOW64 = "1"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\BITS
Start = "2"
(Note: The default value data of the said registry entry is "3".)
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\BITS\Parameters
ServiceDll = %System%\mpeg4c32.dll
(Note: The default value data of the said registry entry is %system%\qmgr.dll.)
Other System Modifications
This backdoor adds the following registry keys as part of its installation routine:
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows NT\CurrentVersion\
SvcHost
Step 1
Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.
Step 2
Restart in Safe Mode
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To restart in Safe Mode:
• For Windows 2000 users
- Restart your computer.
- Press F8 when you see the Starting Windows bar at the bottom of the screen.
- Choose the Safe Mode option from the Windows Advanced Options menu then press Enter.
• For Windows XP users
- Restart your computer.
- Press F8 after the Power-On Self Test (POST) routine is done. If the Windows Advanced Options menu does not appear, try restarting then pressing F8 several times when the POST screen appears.
- Choose the Safe Mode option from the Windows Advanced Options menu then press Enter.
• For Windows Server 2003 users
- Restart your computer.
- Press F8 after Windows starts up. If the Windows Advanced Options menu does not appear, try restarting again and pressing F8 several times afterward.
- On the Windows Advanced Option menu, use the arrow keys to select Safe Mode then press Enter.
• For Windows Vista and Windows 7 users
- Restart your computer.
- Press F8 after the Power-On Self Test (POST) routine is done. If the Advanced Boot Options menu does not appear, try restarting and then pressing F8 several times after the POST screen is displayed.
- On the Advanced Boot Options menu, use the arrow keys to select the Safe Mode option, and then press Enter.
Step 3
Search and delete these files
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There may be some files that are hidden. Please make sure you check the
Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
- %System%\mpeg4c32.dll
- %System%\tcpipport.sys
To delete malware/grayware files:
- Search for the following files:
- %System%\mpeg4c32.dll
- %System%\tcpipport.sys
Note: To do a search for the following files, right-click Start then click Search... or Find..., depending on the version of Windows you are running. For each file to be deleted, type its file name in the Named input box. In the Look In drop-down list, select My Computer, then press Enter. - Once located, select the file then press SHIFT+DELETE to permanently delete the file.
- Repeat the said steps for all files listed.
Step 4
Delete this registry key
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Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.
- In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
To delete the registry key this malware/grayware created:
- Open Registry Editor. Click Start>Run, type REGEDIT, then press Enter.
- In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Wow6432Node>Microsoft>Windows NT>CurrentVersion - Still in the left panel, locate and delete the key:
SvcHost - In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services - Still in the left panel, locate and delete the key:
TCPIPPORT - Close Registry Editor.
Step 5
Delete this registry value
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Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\BITS
To delete the registry value this malware/grayware created:
- Open Registry Editor. Click Start>Run, type REGEDIT, then press Enter.
- In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>BITS - In the right panel, locate and delete the entry:
WOW64 = "1" - Close Registry Editor.
Step 6
Restore this modified registry value
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Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator’s help. You may also check out this Microsoft article first before modifying your computer's registry.
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\BITS
- From: Start = "2"
To: Start = "3"
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\BITS\Parameters
- From: ServiceDll = %System%\mpeg4c32.dll
To: ServiceDll = %system%\qmgr.dll
To restore the registry value this malware/grayware modified:
- Open Registry Editor.
» For Windows 2000, Windows XP, and Windows Server 2003 users, click Start>Run, type regedit in the text box provided, and then press Enter. - In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>BITS - In the right panel, locate this registry entry:
Start = "2" - Right-click the value name and choose Modify. Change the value data of this entry to:
Start = "3" - In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>BITS>Parameters - In the right panel, locate this registry entry:
ServiceDll = %System%\mpeg4c32.dll - Right-click the value name and choose Modify. Change the value data of this entry to:
ServiceDll = %system%\qmgr.dll - Close Registry Editor.
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_TENPEQ.SM. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.
Step 8
Search and delete this file
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There may be some files that are hidden. Please make sure you check the
Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
To manually delete a malware/grayware file from an affected system:
• For Windows 2000, Windows XP, and Windows Server 2003:
- Right-click Start then click Search....
- In the left panel, click All Files.
- In the Named input box, type the following:
DATA_GENERIC
In the Look In drop-down list, select My Computer then press Enter. Once located, select the file then press SHIFT+DELETE to delete it. • For Windows Vista and Windows 7 users:
- Click Start>Computer.
- In the Search input box, type the following:
DATA_GENERIC - Once located, select the file then press SHIFT+DELETE to delete it.
*Note: Read the following Microsoft page if these steps do not work on Windows 7.
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