BKDR_PROXY.OPS
Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
Threat Type: Backdoor
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
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.
It enables its automatic execution at every system startup by dropping copies of itself into the Windows Common Startup folder.
It does not have any propagation routine.
It executes commands from a remote malicious user, effectively compromising the affected system.
TECHNICAL DETAILS
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.
Autostart Technique
This backdoor enables its automatic execution at every system startup by dropping the following copies of itself into the Windows Common Startup folder:
- %Start Menu%\Programs\Startup\nvvscv.exe
(Note: %Start Menu% is the current user's Start Menu folder, which is usually C:\Windows\Start Menu or C:\Documents and Settings\{User name}\Start Menu on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu on Windows Vista and 7.)
It modifies the following registry entries to ensure it automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
Userinit = "%System%\userinit.exe,{malware path}\{malware file name},"
(Note: The default value data of the said registry entry is "%System%\userinit.exe,".)
Propagation
This backdoor does not have any propagation routine.
Backdoor Routine
This backdoor executes the following commands from a remote malicious user:
- Download and execute arbitrary files
- Use proxy server settings of current user
It connects to the following URL(s) to send and receive commands from a remote malicious user:
- http://www.{BLOCKED}n.info/blog/local/index.php
- http://www.{BLOCKED}dye.com/blog/index.php
As of this writing, the said sites are inaccessible.
Other Details
This backdoor connects to the following URL(s) to check for an Internet connection:
- http://www.microsoft.com
- http://www.msftncsi.com
- http://www.yahoo.co.jp
NOTES:
It does not have rootkit capabilities.
It does not exploit any vulnerability.
SOLUTION
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
Step 3
Restore this modified registry value
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\Microsoft\Windows NT\CurrentVersion\Winlogon
- From: Userinit = "%System%\userinit.exe,{malware path}\{malware file name},"
To: Userinit = %System%\userinit.exe,
- From: Userinit = "%System%\userinit.exe,{malware path}\{malware file name},"
Step 4
Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_PROXY.OPS. 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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