Analysis by: Michael Cabel
 PLATFORM:

Windows 2000, XP, Server 2003

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

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel: Propagates via removable drives

This worm arrives by connecting affected removable drives to a system.

It drops copies of itself in all removable drives.

  TECHNICAL DETAILS

File Size: 21,006,848 bytes
File Type: PE
Memory Resident: Yes
Initial Samples Received Date: 06 Sep 2010

Arrival Details

This worm arrives by connecting affected removable drives to a system.

Installation

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

  • %System Root%\RESTORE\k-1-3542-4232123213-7676767-8888886\X0R.exe

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

Autostart Technique

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{23KLN5J0-4OPM-11WE-AAX5-24EF1D187332}
StubPath = %System Root%\RESTORE\k-1-3542-4232123213-7676767-8888886\X0R.exe

Propagation

This worm drops copies of itself in all removable drives.

The said .INF file contains the following strings:

[autorun]
open=RESTORE\k-1-3542-4232123213-7676767-8888886\X0R.exe
icon=%SystemRoot%\system32\SHELL32.dll,4
action=Open folder to view files
shell\open=Open
shell\open\command=RESTORE\k-1-3542-4232123213-7676767-8888886\X0R.exe
shell\open\default=1

  SOLUTION

Minimum Scan Engine: 8.900
VSAPI OPR PATTERN File: 07.440.06
VSAPI OPR PATTERN Date: 06 Sep 2010

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

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\Active Setup\Installed Components\{23KLN5J0-4OPM-11WE-AAX5-24EF1D187332}
    • StubPath = %System Root%\RESTORE\k-1-3542-4232123213-7676767-8888886\X0R.exe

Step 3

Search and delete AUTORUN.INF files created by WORM_SDBOT.OKS that contain these strings

[ Learn More ]
[autorun]
open=RESTORE\k-1-3542-4232123213-7676767-8888886\X0R.exe
icon=%SystemRoot%\system32\SHELL32.dll,4
action=Open folder to view files
shell\open=Open
shell\open\command=RESTORE\k-1-3542-4232123213-7676767-8888886\X0R.exe
shell\open\default=1

Step 4

Scan your computer with your Trend Micro product to delete files detected as WORM_SDBOT.OKS. 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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