Analysis by: Christopher Daniel So
ALIASES:

Worm:VBS/Morix.A (Microsoft), Win32/Redosdru.HI trojan (Nod32), Trojan.BAT.Generic (Sunbelt)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

This Trojan may be dropped by other malware. It arrives as a component bundled with malware/grayware packages. It may be unknowingly downloaded by a user while visiting malicious websites.

  TECHNICAL DETAILS

File Size: 111 bytes
File Type: VBS
Memory Resident: No
Initial Samples Received Date: 19 Jul 2011

Arrival Details

This Trojan may be dropped by other malware.

It arrives as a component bundled with malware/grayware packages.

It may be unknowingly downloaded by a user while visiting malicious websites.

NOTES:
If the malware file name is 362.vbs, it executes the file Best.bat, which is detected by Trend Micro as BAT_ARUN.ASM. If the malware file name is 363.vbs, it executes the file Cest.bat, which is detected by Trend Micro as BAT_ARUN.F.

  SOLUTION

Minimum Scan Engine: 8.900
FIRST VSAPI PATTERN FILE: 8.298.15
FIRST VSAPI PATTERN DATE: 19 Jul 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

Remove malware files dropped/downloaded by VBS_ARUN.ASM

    BAT_ARUN.ASM
    BAT_ARUN.F

Step 3

Scan your computer with your Trend Micro product to delete files detected as VBS_ARUN.ASM. 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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