INF_OTORUN.WKMZ

June 18, 2015
 Analysis by: Jennifer Gumban
 ALIASES:

VirTool:INF/Autorun.gen!P (Microsoft); Trojan.AutorunINF.Gen (BitDefender); INF/AutoRun!tr (Fortinet)

 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:

766 bytes

File Type:

INF

Initial Samples Received Date:

05 Jun 2015

Arrival Details

This Trojan may be dropped by other malware.

Propagation

The said .INF file contains the following strings:

[{garbage code}]
{garbage code}={garbage code}
[{garbage code}]
{garbage code}={garbage code}
[{garbage code}]
{garbage code}={garbage code}
[{garbage code}]
{garbage code}={garbage code}
[auTOrUn]
aCTIoN=OPen
{garbage code}={garbage code}
icOn=%WIndIr%\sYSTEM32\SHell32.DLl,4
{garbage code}={garbage code}
USEauTOpLaY=1
{garbage code}={garbage code}
OPen=RUNDLL32.EXe seTup50777.FON,3F30e81
{garbage code}={garbage code}
SHEll\exPLORe\COMMANd=RundLl32.EXe sETUP50777.FOn,3F30E81
{garbage code}={garbage code}
shell\oPeN\CoMmAND=rundLL32.exE sETUp50777.FoN,3F30E81
{garbage code}={garbage code}

Other Details

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

  • RUNDLL32.EXe seTup50777.FON,3F30e81

  SOLUTION

Minimum Scan Engine:

9.750

FIRST VSAPI PATTERN FILE:

11.712.07

FIRST VSAPI PATTERN DATE:

05 Jun 2015

VSAPI OPR PATTERN File:

11.713.00

VSAPI OPR PATTERN Date:

06 Jun 2015

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_OTORUN.WKMZ. 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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