Analysis by: Marfel Tiamzon
 PLATFORM:

Windows 98, ME, NT, 2000, XP, 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: 58,928 bytes
File Type: EXE
Memory Resident: Yes

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.

Installation

This Trojan injects itself into the following processes running in the affected system's memory:

  • lsass.exe

Autostart Technique

This Trojan registers itself as a system service to ensure its automatic execution at every system startup by adding the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\usbmouseb
=

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\usbmouseb
ImagePath = /??/%SYSTEM%/drivers/Wingms1.sys

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\usbmouseb
DisplayName = usbmouseb

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\usbmouseb
ErrorControl = 1

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\usbmouseb
Start = 3

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\usbmouseb
Type = 1

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Wingms
=

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Wingms
Description = Windows Gateway Manager System

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Wingms
DisplayName = Wingms

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Wingms
ImagePath = %SYSTEM%\Wingms1.exe -u

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Wingms
Start = 2

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Wingms
ErrorControl = 1

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Wingms
Type = 10

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Wingms1
=

  SOLUTION

Minimum Scan Engine: 8.900
FIRST VSAPI PATTERN FILE: 7.194.08
FIRST VSAPI PATTERN DATE: 25 May 2010
VSAPI OPR PATTERN File: 7.195.00
VSAPI OPR PATTERN Date: 25 May 2010

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

[ Learn More ]

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
    • usbmouseb
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
    • Wingms
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
    • Wingms1

Step 4

Scan your computer with your Trend Micro product to delete files detected as TROJ_BLAZGEL.SMT. 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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