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WORM_AUTORUN.MKA

October 08, 2012
 Analysis by: Marfel Tiamzon
 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. 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:

18,433 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

26 Jul 2010

Arrival Details

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

Installation

This worm adds the following folders:

  • %System Root%:\KAFA
  • %System Root%:\KAFA\HOLAZ

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

It drops the following copies of itself into the affected system:

  • %System Root%:\KAFA\HOLAZ\blsa.exe

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

It injects itself into the following processes as part of its memory residency routine:

  • explorer.exe

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\{67KL5J3-4OPN-15WE-KKX5-44QB2218}
StubPath = %System Root%:\KAFA\HOLAZ\blsa.exe

It drops the following files:

  • %System Root%:\KAFA\HOLAZ\DesKTop.ini

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

Propagation

This worm creates the following folders in all removable drives:

  • KAFA
  • KAFA\HOLAZ

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

  • KAFA\HOLAZ\blsa.exe

It 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]
open=KAFA\HOLAZ\blsa.exe
;Christiano Ronaldo Is A WOW PLAYER.
action=Open folder to view files
shell\open=Open
shell\open\command=KAFA\HOLAF\blsa.exe
shell\open\default=1
UseAutoPlay=1

  SOLUTION

Minimum Scan Engine:

8.900

VSAPI OPR PATTERN File:

7.394.02

VSAPI OPR PATTERN Date:

18 Aug 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

Restart in Safe Mode

[ Learn More ]

Step 3

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\Active Setup\Installed Components\
    • {67KL5J3-4OPN-15WE-KKX5-44QB2218}

Step 4

Scan your computer with your Trend Micro product to delete files detected as WORM_AUTORUN.MKA. 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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