WORM_OTORUN.MJSM

October 09, 2012
 Modified by: Erika Bianca Mendoza
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

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

It drops copies of itself into all the removable drives connected to an affected system. It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.

  TECHNICAL DETAILS

File Size:

159,744 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

18 Nov 2011

Arrival Details

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

Propagation

This worm creates the following folders in all removable drives:

  • RECYCLER

It drops copies of itself into all the removable drives connected to an affected system.

It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.

The said .INF file contains the following strings:

[autorun]
open=.\RECYCLER\S-1-5-21-3441485041-918478196-174860263-1004\run.exe
icon=%SystemRoot%\system32\SHELL32.dll,4
action=.\RECYCLER\S-1-5-21-3441485041-918478196-174860263-1004\run.exe
shell\open=.\RECYCLER\S-1-5-21-3441485041-918478196-174860263-1004\run.exe
shell\open\command=.\RECYCLER\S-1-5-21-3441485041-918478196-174860263-1004\run.exe
shell\open\default=1

Other Details

This worm connects to the following possibly malicious URL:

  • {BLOCKED}5.{BLOCKED}5.229.85/naver.php

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

8.582.05

FIRST VSAPI PATTERN DATE:

18 Nov 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

Identify and terminate files detected as WORM_OTORUN.MJSM

[ Learn More ]
  1. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  2. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

Step 3

Search and delete AUTORUN.INF files created by WORM_OTORUN.MJSM that contain these strings

[ Learn More ]
[autorun] 
open=.\RECYCLER\S-1-5-21-3441485041-918478196-174860263-1004\run.exe 
icon=%SystemRoot%\system32\SHELL32.dll,4 
action=.\RECYCLER\S-1-5-21-3441485041-918478196-174860263-1004\run.exe 
shell\open=.\RECYCLER\S-1-5-21-3441485041-918478196-174860263-1004\run.exe 
shell\open\command=.\RECYCLER\S-1-5-21-3441485041-918478196-174860263-1004\run.exe
shell\open\default=1 

Step 4

Search and delete this folder

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • RECYCLER

Step 5

Scan your computer with your Trend Micro product to delete files detected as WORM_OTORUN.MJSM. 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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