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 as an attachment to email messages spammed by other malware/grayware or malicious users. It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It deletes itself after execution.

  TECHNICAL DETAILS

File Size: 52,224 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 01 Aug 2011

Arrival Details

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

It 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 Trojan drops the following file(s) in the Windows User Startup folder to enable its automatic execution at every system startup:

  • %User Startup%\dxdiag.exe

(Note: %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup.)

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}apegpge2011.ru/forum4/task.php?bid=365ff1a8bc8e5acb&os=5-1-2600&uptime=0&rnd=459609
  • http://{BLOCKED}apegpge2011.ru/forum4/task.php?bid=365ff1a8bc8e5acb&os=5-1-2600&uptime=0&rnd=475578
  • http://{BLOCKED}apegpge2011.ru/forum4/task.php?bid=365ff1a8bc8e5acb&os=5-1-2600&uptime=0&rnd=490578
  • http://{BLOCKED}arkbmx2011.ru/forum4/task.php?bid=365ff1a8bc8e5acb&os=5-1-2600&uptime=0&rnd=505078
  • http://{BLOCKED}arkbmx2011.ru/forum4/task.php?bid=365ff1a8bc8e5acb&os=5-1-2600&uptime=0&rnd=505656
  • http://{BLOCKED}arkbmx2011.ru/forum4/task.php?bid=365ff1a8bc8e5acb&os=5-1-2600&uptime=0&rnd=506156

It deletes itself after execution.

  SOLUTION

Minimum Scan Engine: 9.200
FIRST VSAPI PATTERN FILE: 8.326.09
FIRST VSAPI PATTERN DATE: 01 Aug 2011
VSAPI OPR PATTERN File: 8.327.00
VSAPI OPR PATTERN Date: 01 Aug 2011

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

Restart in Safe Mode

[ Learn More ]

Step 3

Search and delete this file

[ Learn More ]

There may be some component files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden files and folders in the search result.  
  • %User Startup%\dxdiag.exe

Step 4

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_INJECT.REF. 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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