Analysis by: Kathleen Notario
 PLATFORM:

Windows 98, ME, NT, 2000, XP, Server 2003

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

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel: Propagates via removable drives

This worm drops copies of itself in all 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: 283,136 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 30 Jul 2010

Installation

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

  • %Windows%\sysdiag64.exe

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

It terminates the execution of the copy it initially executed and executes the copy it drops instead.

Autostart Technique

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
sysdiag64.exe = %Windows%\sysdiag64.exe

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer\Run
MicrosoftCorp = %Windows%\sysdiag64.exe

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
MicrosoftNAPC = %Windows%\sysdiag64.exe

Propagation

This worm drops copies of itself in all 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.

The said .INF file contains the following strings:

autorun]
[autorun[
[autorun]
open=cold\hott\sysdiag64.exe
icon=%SystemRoot%\system32\SHELL32.dll,4
action=Open folder to view files
UseAuTOPLAY=1
shell\\open\\command=cold\hott\sysdiag64.exe
shell\\Explore\\Command=cold\hott\sysdiag64.exe

  SOLUTION

Minimum Scan Engine: 8.900
VSAPI PATTERN File: 7.348.03
VSAPI PATTERN Date: 30 Jul 2010
VSAPI PATTERN Date: 7/30/2010 12:00:00 AM

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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • sysdiag64.exe=%Windows%\sysdiag64.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\Run
    • MicrosoftCorp=%Windows%\sysdiag64.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    • MicrosoftNAPC=%Windows%\sysdiag64.exe

Step 3

Scan your computer with your Trend Micro product to delete files detected as WORM_KOLAB.GO. 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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