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WORM_AUTORUN.KMO

October 08, 2012
 Analysis by: Erika Bianca Mendoza
 PLATFORM:

Windows 98, ME, NT, 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


This worm creates folders where it drops its files. It uses the default Windows folder icon to trick users into opening the file. Double-clicking the file executes this malware.

It drops copies of itself into all the removable drives connected to an affected system. It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.

It downloads a file from a certain URL then renames it before storing it in the affected system.

  TECHNICAL DETAILS

File Size:

1,514 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

05 Nov 2008

Installation

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

  • %system%\36D0F1\2ADE6B.EXE

It drops the following files:

  • %system%\10A216\krnln.fnr
  • %system%\10A216\shell.fne
  • %system%\10A216\eAPI.fne
  • %system%\10A216\internet.fne
  • %system%\10A216\spec.fne
  • %system%\10A216\RegEx.fnr
  • %system%\10A216\dp1.fne
  • %system%\10A216\com.run
  • %system%\B55985\0f10.inf
  • %system%\B55985\16eb.inf
  • %system%\B55985\16eb.EDT

It uses the default Windows folder icon to trick users into opening the file. Double-clicking the file executes this malware.

It uses the following names for the copies it drops:

  • ¡¡.exe
  • ¡¡¡¡.exe
  • ¡¡¡¡¡¡.exe
  • Notepad.exe

Propagation

This worm drops copies of itself into all the removable drives connected to an affected system.

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=Notepad.exe
shell\1=´ò¿ª(&O)
shell\1\Command=Notepad.exe
shell\2\=ä¯ÀÀ(&B)
shell\2\Command=Notepad.exe
shellexecute=Notepad.exe

Download Routine

This worm downloads files from the following URLs then renames them before storage in the affected system:

  • http://www.{BLOCKED}8.com/f/tc13.gif - detected as WORM_FLYSTUD.SMA
  • http://www.{BLOCKED}8.com/f/gc13.gif - detected as WORM_FLYSTUD.SMA

  SOLUTION

Minimum Scan Engine:

8.900

FIRST VSAPI PATTERN FILE:

7.320.12

FIRST VSAPI PATTERN DATE:

19 Jul 2010

VSAPI OPR PATTERN File:

7.321.00

VSAPI OPR PATTERN Date:

19 Jul 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

Remove malware files dropped/downloaded by WORM_AUTORUN.KMO

    WORM_FLYSTUD.SMA

Step 3

Terminate the malware/grayware/spyware process:

[ Learn More ]
  • For Windows 98 and ME users, 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.
  • 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.
  • If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

    • Step 4

    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%\36D0F1
    • %System%\10A216
    • %System%\B55985

    Step 5

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