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WORM_OTORUN.GM

October 09, 2012
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This worm 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:

28,195 bytes

File Type:

EXE

File Compression:

UPX

Memory Resident:

No

Initial Samples Received Date:

09 Mar 2009

Installation

This worm drops the following copies of itself into the affected system:

  • %Program Files%\Internet Explorer\OnlO0r.bak

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.)

It drops the following files:

  • %Program Files%\Common Files\fjOs0r.dll - detected by Trend Micro as TSPY_QQPASS.DDW
  • %Program Files%\Internet Explorer\OnlO0r.dll - detected by Trend Micro as TSPY_QQPASS.DDW

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.)

Other System Modifications

This worm deletes the following files:

  • %System%\drivers\etc\hosts

(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)

Propagation

This worm drops the following copy(ies) of itself in all removable drives:

  • Windows.scr

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=Windows.scr
shellexecute=Windows.scr
shell\Auto\command=Windows.scr
shell=Auto

NOTES:
The dropped AUTORUN.INF is detected by Trend Micro as Mal_Otorun2.

  SOLUTION

Minimum Scan Engine:

8.900

FIRST VSAPI PATTERN FILE:

5.883.00

FIRST VSAPI PATTERN DATE:

09 Mar 2009

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

Remove malware files dropped/downloaded by WORM_OTORUN.GM

    TSPY_QQPASS.DDW
    Mal_Otorun2

Step 3

Search and delete this file

[ Learn More ]
There may be some component files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden files and folders in the search result.
%Program Files%\Common Files\fjOs0r.dll
%Program Files%\Internet Explorer\OnlO0r.dll

Step 4

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

[ Learn More ]
[autorun]
open=Windows.scr
shellexecute=Windows.scr
shell\Auto\command=Windows.scr
shell=Auto

Step 5

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

Step 6

Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.

  • %System%\drivers\etc\hosts


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