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INF_OTORUN.AUSA

October 28, 2016
 Analysis by: Cris Nowell Pantanilla
 ALIASES:

VirTool:INF/Autorun.gen [generic] (Microsoft),

 PLATFORM:

Windows

 OVERALL RISK RATING:
 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:

371 bytes

File Type:

INF

Memory Resident:

No

Initial Samples Received Date:

25 Oct 2016

Payload:

Executes files

Arrival Details

This Trojan may be dropped by other malware.

Propagation

The said .INF file contains the following strings:

;{garbage}
[AutoRun]
;{garbage}
SHell\oPeN\DeFault=1
;{garbage}
SHELl\OPeN\comMand = {random}.exe
;{garbage}
OPen ={random}.exe
;{garbage}
ShelL\exPLore\CoMmaND ={random}.exe
;{garbage}
shELl\AUtOPLay\coMMand ={random}.exe

Other Details

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

  • {Drive}:\{random}.exe

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

12.858.08

FIRST VSAPI PATTERN DATE:

25 Oct 2016

VSAPI OPR PATTERN File:

12.859.00

VSAPI OPR PATTERN Date:

26 Oct 2016

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.AUSA. 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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