Analysis by: Sabrina Lei Sioting

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: Yes

  • 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.

  TECHNICAL DETAILS

File Size: 98,304 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 23 May 2012

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 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 name}.exe"

(Note: The default value data of the said registry entry is %System%\userinit.exe,.)

Other Details

This backdoor connects to the following possibly malicious URL:

  • http://{BLOCKED}.gr.jp/main/map/news/index.php
  • http://{BLOCKED}.gr.jp/main/map/news/xmlrpc.php
  • http://{BLOCKED}.gr.jp/main/map/news/feeds.php
  • http://{BLOCKED}.gr.jp/main/map/news/show.php
  • http://{BLOCKED}.gr.jp/main/map/news/files/

  SOLUTION

Minimum Scan Engine: 9.200

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

Identify and delete files detected as BKDR_PROXY.SS using either the Startup Disk or Recovery Console

[ Learn More ]

Step 3

Restore this modified registry value

[ Learn More ]

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 name}.exe"
      To: Userinit = "%System%\userinit.exe,"

Step 4

Scan your computer with your Trend Micro product to delete files detected as BKDR_PROXY.SS. 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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