Analysis by: Alvin Bacani
ALIASES:

Backdoor:Win32/Plugx.A (Microsoft)

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

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

  • 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: 159,744 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 22 Oct 2013

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.

Other System Modifications

This backdoor adds the following registry entries as part of its installation routine:

HKEY_CLASSES_ROOT\MJ
CLSID = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
MJ
CLSID = "{random values}"

Other Details

This backdoor connects to the following possibly malicious URL:

  • {BLOCKED}y.{BLOCKED}y.com

  SOLUTION

Minimum Scan Engine: 9.300
FIRST VSAPI PATTERN FILE: 10.358.08
FIRST VSAPI PATTERN DATE: 22 Oct 2013
VSAPI OPR PATTERN File: 10.359.00
VSAPI OPR PATTERN Date: 22 Oct 2013

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

Scan your computer with your Trend Micro product and note files detected as BKDR_POISON.BVP

Step 3

Terminate a process file/s detected as BKDR_POISON.BVP

[ Learn More ]

*Note: If the detected file/s is/are not displayed in theWindows Task Manager, continue doing the next steps.

Step 4

Delete this 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_CLASSES_ROOT\MJ
    • CLSID = "{Random Values}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\MJ
    • CLSID = "{Random Values}"

Step 5

Scan your computer with your Trend Micro product to delete files detected as BKDR_POISON.BVP. 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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