BKDR_MOTRIX.RE
Backdoor:Win32/Morix.B (Microsoft)
Windows 2000, Windows XP, Windows Server 2003
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Backdoor
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This backdoor connects to a website to send and receive information.
TECHNICAL DETAILS
200,837 bytes
EXE
Yes
01 Mar 2012
Installation
This backdoor drops the following files:
- %Program Files%\Windows Media Player\wupdmgr32.dll
- %Windows%\ThankU.txt
(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.. %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)
Autostart Technique
This backdoor adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\wind0ws\Parameters
ServiceDll = "%Program Files%\Windows Media Player\wupdmgr32.dll"
Other System Modifications
This backdoor adds the following registry keys:
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\wind0ws
HKEY_LOCAL_MACHINE\SOFTWARE\ThankU
Backdoor Routine
This backdoor connects to the following websites to send and receive information:
- http://{BLOCKED}n.3322.org
SOLUTION
9.200
8.808.06
01 Mar 2012
8.809.00
01 Mar 2012
Step 1
For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.
Step 2
Restart in Safe Mode
Step 3
Search and delete these files
- %Program Files%\Windows Media Player\wupdmgr32.dll
- %Windows%\ThankU.txt
Step 4
Delete this registry key
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\ControlSet001\Services
- wind0ws
- wind0ws
- In HKEY_LOCAL_MACHINE\SOFTWARE
- ThankU
- ThankU
Step 5
Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_MOTRIX.RE. 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.
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