Analysis by: Kiyoshi Obuchi
 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: No

  • In the wild: Yes

  OVERVIEW

Canal de infecção: Dropped by other malware

This Trojan may be dropped by other malware.

It automatically executes files when a user opens a drive. This is the Trend Micro detection for files that exhibit certain behaviors.

  TECHNICAL DETAILS

Tipo de compactação: 56,572 bytes
Tipo de arquivo: INF
Residente na memória: No
Data de recebimento das amostras iniciais: 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}
[AUTorUN]
AcTION =フォルダを開いてファイルを表示する
icon =%syStEmrOot%\sySTEM32\sHELL32.Dll,4
shelLExECUte=RuNdLl32.EXE .\RECYCLER\S-5-3-42-2819952290-8240758988-879315005-3665\jwgkvsq.vmx,ahaezedrn
useAuTopLAY= 1
{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

This is the Trend Micro detection for:

  • AUTORUN.INF files that are dropped by WORM_DOWNAD variants

  SOLUTION

Mecanismo de varredura mínima: 9.850
Primeiro arquivo padrão VSAPI: 14.874.02
Data do lançamento do primeiro padrão VSAPI: 16 Mar 2019
VSAPI OPR Pattern Version: 14.875.00
VSAPI OPR Pattern veröffentlicht am: 17 Mar 2019

Step 1

Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 users must disable System Restore to allow full scanning of their computers.

Step 2

Remove the malware/grayware file that dropped/downloaded Trojan.INF.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 Trojan.INF.DOWNAD.MJV that contain these strings

[ Learn More ]
  • {Multiple lines of garbage}
  • [AUTorUN]
  • AcTION =フォルダを開いてファイルを表示する
  • icon =%syStEmrOot%\sySTEM32\sHELL32.Dll,4
  • shelLExECUte=RuNdLl32.EXE .\RECYCLER\S-5-3-42-2819952290-8240758988-879315005-3665\jwgkvsq.vmx,ahaezedrn
  • useAuTopLAY= 1
  • {Multiple lines of garbage}

Step 4

Scan your computer with your Trend Micro product to delete files detected as Trojan.INF.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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