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Threat Encyclopedia

WORM_LUDER.USR

ANALYSIS BY

Jaime Benigno Reyes


ALIASES:

Worm:Win32/Rebhip.A (Microsoft), Worm.Win32.Luder.tvz (Kaspersky)

PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

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:

9.300

FIRST VSAPI PATTERN FILE:

9.900.05

FIRST VSAPI PATTERN DATE:

06 May 2013

VSAPI OPR PATTERN File:

9.901.00

VSAPI OPR PATTERN Date:

07 May 2013

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

Restart in Safe Mode

[ Learn More ]

Step 3

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\policies\Explorer\Run
    • Policies = "%System%\install\server.exe"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run
    • Policies = "%System%\install\server.exe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    • HKLM = "%System%\install\server.exe"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • HKCU = "%System%\install\server.exe"

Step 4

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_CURRENT_USER\Software
    • vítima
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components
    • {08B0E5JF-4FCB-11CF-AAA5-00401C6XX500}

Step 5

Search and delete these files

[ 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.
  • %Application Data%\logs.dat
  • %User Temp%\XX--XX--XX.TXT
  • %User Temp%\UuU.uUu
  • %User Temp%\XxX.xXx

Step 6

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.
  • %System%\install
  • {removable drive letter}:\RECYCLER

Step 7

Search and delete AUTORUN.INF files created by WORM_LUDER.USR that contain these strings

[ Learn More ]
[autorun]
;open=RECYCLER\S-1-5-21-1482476501-3352491937-682996330-1013\server.exe
icon=shell32.dll,4
shellexecute=RECYCLER\S-1-5-21-1482476501-3352491937-682996330-1013\server.exe
label=PENDRIVE
action=Open folder to view files
shell\Open=Open
shell\Open\command=RECYCLER\S-1-5-21-1482476501-3352491937-682996330-1013\server.exe
shell\Open\Default=1

Step 8

Restart in normal mode and scan your computer with your Trend Micro product for files detected as WORM_LUDER.USR. 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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