TROJ_DROPPER.VSX

October 13, 2012
 ALIASES:

Backdoor:Win32/Grifwin.B (Microsoft); Generic Dropper!1aw (McAfee); Trojan.Dropper (Symantec); Trojan-Dropper.Win32.Agent.fxag (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan.Generic.6550992 (FSecure)

 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.

It deletes itself after execution.

  TECHNICAL DETAILS

File Size:

319,488 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

20 Jul 2012

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 creates the following folders:

  • %Windows% Graphics Manager

(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)

Other System Modifications

This Trojan deletes the following files:

  • %Common Startup%\Windows Graphics Manager.lnk
  • %Program Files%\Windows Graphics Manager\wingrfm.exe

(Note: %Common Startup% is the system's shared Startup folder, which is usually C:\Windows\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\All Users\Programs\Startup on Windows NT, and C:\Documents and Settings\All Users\Start Menu\Programs\Startup on Windows 2000, XP, and Server 2003.. %Program Files% is the default Program Files folder, usually C:\Program Files.)

Dropping Routine

This Trojan drops the following files:

  • %Windows% Graphics Manager\wingrfm.exe
  • %User Startup%\Windows Graphics Manager.lnk
  • %Windows% Graphics Manager\wingrfm.ini

(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.. %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 deletes itself after execution.

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.200

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

Search and delete these files

[ 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.
  • %Windows% Graphics Manager\wingrfm.exe
  • %User Startup%\Windows Graphics Manager.lnk
  • %Windows% Graphics Manager\wingrfm.ini

Step 3

Search and delete this folder

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %Windows% Graphics Manager

Step 4

Scan your computer with your Trend Micro product to delete files detected as TROJ_DROPPER.VSX. 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.

Step 5

Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.

  • %Common Startup%\Windows Graphics Manager.lnk
  • %Program Files%\Windows Graphics Manager\wingrfm.exe


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