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Threat Encyclopedia

WORM_LAMIN.AC

ANALYSIS BY

Roland Marco Dela Paz


ALIASES:

W32.IRCBot, Worm:Win32/Lamin.A

PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type:Worm

  • Destructiveness:No

  • Encrypted: Yes

  • In the wild: Yes

OVERVIEW

TECHNICAL DETAILS

SOLUTION

Minimum Scan Engine:

8.900

FIRST VSAPI PATTERN FILE:

7.124.01

FIRST VSAPI PATTERN DATE:

24 Apr 2010

VSAPI OPR PATTERN File:

7.125.00

VSAPI OPR PATTERN Date:

24 Apr 2010

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

Identify and terminate files detected as WORM_LAMIN.AC

[ Learn More ]
  1. Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
  2. 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.
  3. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

Step 3

Enable Registry Editor

[ Learn More ]
By doing this step, you also enable other applications/programs disabled by this malware/grayware/spyware.

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_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Winlogon
    • Shell = %Program Files%\Microsoft Office\OFFICE11\WINWORD.EXE
  • In HKEY_CLASSES_ROOT\exefile
    • NeverShowExt =
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\system
    • EnableLUA = 0
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\{Application name}
    • Debugger = cmd.exe /c del

Step 5

Delete this registry key

[ 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\Security Center\
    • Svc
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\
    • FWCFG
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\
    • WinDefend
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
    • Security Center

Step 6

Restore this modified 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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
    • From: SuperHidden = 0
      To: SuperHidden = 1
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
    • From: ShowSuperHidden = 0
      To: ShowSuperHidden = 1
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess
    • From: Type = 4
      To: Type = 20
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess
    • From: Start = 4
      To: Start = 2
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\wscsvc
    • From: Type = 4
      To: Type = 20
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\wscsvc
    • From: Start = 4
      To: Start = 2
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\wuauserv
    • From: Type = 4
      To: Type = 20
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\wuauserv
    • From: Start = 4
      To: Start = 2

Step 7

Search and delete this file

[ Learn More ]
There may be some 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%\Microsoft Office\OFFICE11\control.ini
  • %Program Files%\Microsoft Office\OFFICE11\Drvics32.dll
  • %Program Files%\Microsoft Office\OFFICE11\hjwgsd.dll
  • %Program Files%\Microsoft Office\OFFICE11\jwiegh.dll
  • %Program Files%\Microsoft Office\OFFICE11\PUB60SP.mrc
  • %Program Files%\Microsoft Office\OFFICE11\remote.ini
  • %Program Files%\Microsoft Office\OFFICE11\ruimsbbe.dll
  • %Program Files%\Microsoft Office\OFFICE11\yofc.dll
  • %Program Files%\Microsoft Office\OFFICE11\smss.exe

Step 8

Scan your computer with your Trend Micro product to delete files detected as WORM_LAMIN.AC. 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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