INF_AUTORUN.SMH

August 28, 2013
 Analysis by: Rika Joi Gregorio
 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

 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:

Varies

File Type:

INF

Initial Samples Received Date:

23 Aug 2013

Arrival Details

This Trojan may be dropped by other malware.

Propagation

The said .INF file contains the following strings:

[autorun]
{random}
S-1-5-21-{random digits}
USEAUTOPLAY=1
open=RECYCLER\S-1-5-21-{random digits}\autorunme.scr
S-1-5-21-{random digits}
S-1-5-21-{random digits}

action=Open folder to view files
S-1-5-21-{random digits}

shell\open=Open
shell\open\command=RECYCLER\S-1-5-21-{random digits}\autorunme.scr
shell\open\default=1
S-1-5-21-{random digits}
S-1-5-21-{random digits}

Other Details

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

  • {Drive Letter}:\RECYCLER\S-1-5-21-{random digits}\autorunme.scr

  SOLUTION

Minimum Scan Engine:

9.300

VSAPI OPR PATTERN File:

10.241.00

VSAPI OPR PATTERN Date:

27 Aug 2013

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

Scan your computer with your Trend Micro product to delete files detected as INF_AUTORUN.SMH. 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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