Analysis by: Rika Joi Gregorio
ALIASES:

Worm:Win32/Autorun!inf(Microsoft), W32/AutoInf.A(Fortinet), Trojan.Autorun(Ikarus), BAT/Autorun.JWJ(Panda)

 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:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel: Dropped by other malware

This Trojan may be dropped by other malware.

It automatically executes files when a user opens a drive.

  TECHNICAL DETAILS

File Size: 1,224 bytes
File Type: INF
Memory Resident: No
Initial Samples Received Date: 04 Jun 2013
Payload: Executes files

Arrival Details

This Trojan may be dropped by other malware.

Propagation

The said .INF file contains the following strings:

{garbage codes}
[autorun]
open=RECYCLER\R-1-5-21-{random digits}\ecleaner.exe
{garbage codes}
icon=%SystemRoot%\system32\SHELL32.dll,4
action=Open folder to view files
shell\open=Open
shell\open\command=RECYCLER\R-1-5-21-{random digits}\ecleaner.exe
{garbage codes}
shell\open\default=1
{garbage codes}

Other Details

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

  • {Drive Letter}:\RECYCLER\R-1-5-21-{random digits}\ecleaner.exe

  SOLUTION

Minimum Scan Engine: 9.200
FIRST VSAPI PATTERN FILE: 9.960.08
FIRST VSAPI PATTERN DATE: 04 Jun 2013
VSAPI OPR PATTERN File: 9.961.00
VSAPI OPR PATTERN Date: 05 Jun 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 TROJ_OTORUN.SML. 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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