Analysis by: Rhena Inocencio
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Trojan 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: 65,536 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 03 Dec 2009

Arrival Details

This Trojan 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 Trojan adds the following registry keys:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Winehplr

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Winehplr\Security

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

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Winehplr
Type = "10"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Winehplr
Start = "2"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Winehplr
ErrorControl = "1"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Winehplr
ImagePath = "{Malware Path and File Name}"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Winehplr
DisplayName = "Windows Explorer Helper"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Winehplr
ObjectName = "LocalSystem"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Winehplr\Security
Security = "{random values)"

  SOLUTION

Minimum Scan Engine: 9.200
VSAPI OPR PATTERN File: 7.549.00
VSAPI OPR PATTERN Date: 18 Oct 2010

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

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_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Winehplr
    • Type = "10"
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Winehplr
    • Start = "2"
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Winehplr
    • ErrorControl = "1"
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Winehplr
    • ImagePath = "{Malware Path and File Name}"
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Winehplr
    • DisplayName = "Windows Explorer Helper"
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Winehplr
    • ObjectName = "LocalSystem"
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Winehplr\Security
    • Security = "{random values)"

Step 3

Delete this registry key

[ 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\SYSTEM\CurrentControlSet\Services
    • Winehplr

Step 4

Scan your computer with your Trend Micro product to delete files detected as TROJ_AGENT.WRGQ. 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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