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 arrives via removable drives.

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: 128,000 bytes
Memory Resident: Yes
Initial Samples Received Date: 03 Feb 2012

Arrival Details

This worm arrives via removable drives.

Installation

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

  • %Windows%\igfxsrvc.exe

(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)

Autostart Technique

This worm adds the following registry entries to enable its automatic execution at every system startup:

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Run
lgxfsrvc = "%Windows%\igfxsrvc.exe"

Propagation

This worm creates the following folders in all removable drives:

  • {removable drive}:\RECYCLER\S-1-5-21-3441485041-918478196-174860263-1004

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

  • {removable drive}:\RECYCLER\S-1-5-21-3441485041-918478196-174860263-1004\RUN.EXE

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=Open folders to view files
shell\open=1
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:

  • http://{BLOCKED}.{BLOCKED}.229.85/naver.php?naver={Random Values}

  SOLUTION

Minimum Scan Engine: 9.200
FIRST VSAPI PATTERN FILE: 8.752.03
FIRST VSAPI PATTERN DATE: 03 Feb 2012

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

Scan your computer with your Trend Micro product and note files detected as WORM_OTORUN.XXZ

Step 3

Terminate a process file/s detected as WORM_OTORUN.XXZ

[ Learn More ]

*Note: If the detected file/s is/are not displayed in theWindows Task Manager, continue doing the next steps.

Step 4

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
    • lgxfsrvc = "%Windows%\igfxsrvc.exe"

Step 5

Search and delete these folders

[ 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. {removable drive}:\RECYCLER\S-1-5-21-3441485041-918478196-174860263-1004

Step 6

Search and delete AUTORUN.INF files created by WORM_OTORUN.XXZ 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=Open folders to view files
shell\open=1
shell\open\command=.\RECYCLER\S-1-5-21-3441485041-918478196-174860263-1004\run.exe
shell\open\default=1

Step 7

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