Analysis by: John Anthony Banes

ALIASES:

W32.Downadup!autorun (Symantec); Win32.Worm.DownadupINF.Gen (BitDefender); Worm.Win32.AutoRun.gxk (Kaspersky)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Trojan may be dropped by other malware.

It automatically executes files when a user opens a drive.

  TECHNICAL DETAILS

File Size: 56,572 bytes
File Type: INF
Memory Resident: No
Initial Samples Received Date: 02 Jan 2009

Arrival Details

This Trojan may be dropped by the following malware:

Propagation

The said .INF file contains the following strings:

{multiple lines of garbage}
icon=%syStEmrOot%\sySTEM32\sHELL32.Dll ,4
{multiple lines of garbage}
shelLExECUte=RuNdLl32.EXE .\RECYCLER\S-5-3-42-2819952290-8240758988-879315005-3665\jwgkvsq.vmx,ahaezedrn
{multiple lines of garbage}

Other Details

This Trojan automatically executes the following files when a user opens a drive:

  • .\RECYCLER\S-5-3-42-2819952290-8240758988-879315005-3665\jwgkvsq.vmx

  SOLUTION

Minimum Scan Engine: 9.850

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

Remove the malware/grayware file that dropped/downloaded TROJ_DOWNAD.MJV. (Note: Please skip this step if the threat(s) listed below have already been removed.)

    • WORM_DOWNAD.MJV

Step 3

Search and delete AUTORUN.INF files created by TROJ_DOWNAD.MJV that contain these strings

[ Learn More ]
 
  • {multiple lines of garbage}
  • icon=%syStEmrOot%\sySTEM32\sHELL32.Dll ,4
  • {multiple lines of garbage}
  • shelLExECUte=RuNdLl32.EXE .\RECYCLER\S-5-3-42-2819952290-8240758988-879315005-3665\jwgkvsq.vmx,ahaezedrn
  • {multiple lines of garbage}

Step 4

Scan your computer with your Trend Micro product to delete files detected as TROJ_DOWNAD.MJV. 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 the following Trend Micro Support pages for more information:


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