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Threat Encyclopedia

WORM_AUTORUN.FJK

ANALYSIS BY

Michael Cabel


PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

OVERALL RISK RATING:
DISTRIBUTION POTENTIAL:
REPORTED INFECTION:

  • Threat Type:Worm

  • Destructiveness:No

  • Encrypted: No

  • In the wild: Yes

OVERVIEW


This worm may be unknowingly downloaded by a user while visiting malicious websites.

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:

685,568 bytes

File Type:

PE

Memory Resident:

Yes

Initial Samples Received Date:

07 Oct 2010

Arrival Details

This worm may be unknowingly downloaded by a user while visiting malicious websites.

It may be downloaded from the following remote sites:

  • http://{BLOCKED}o.fileave.com/226.exe

Installation

This worm drops the following non-malicious file:

  • %System Root%\temp\temp\shots.exe

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

Other System Modifications

This worm adds the following registry keys as part of its installation routine:

HKEY_CURRENT_USER\Software\229_iena

Propagation

This worm drops the following copy of itself in all physical and removable drives:

  • SecurityUSB.exe

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]
shellexecute=SecurityUSB.ex

Other Details

Based on analysis of the codes, it has the following capabilities:

  • It saves the dropped .INF file as BOOT.INF instead of saving it as AUTORUN.INF.

SOLUTION

Minimum Scan Engine:

8.900

VSAPI PATTERN File:

07.520.09

VSAPI PATTERN Date:

07 Oct 2010

VSAPI PATTERN Date:

10/7/2010 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

Terminate a process file/s detected as WORM_AUTORUN.FJK

[ Learn More ]

*Note: If the detected file/s is/are not displayed in theWindows Task Manager, continue doing the next steps.


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. Before you could do this, you must restart in Safe Mode. For instructions on how to do this, you may refer to this page If the preceding step requires you to restart in safe mode, you may proceed to edit the system registry.

 
  • In HKEY_CURRENT_USER\Software
    • 229_iena

Step 4

Search and delete AUTORUN.INF files created by WORM_AUTORUN.FJK that contain these strings

[ Learn More ]
[autorun]
shellexecute=SecurityUSB.ex

(Note: This malware uses a file named BOOT.INF instead of AUTORUN.INF.)

Step 5

Search and delete this file

[ Learn More ]
There may be some component 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.
%System Root%\temp\temp\shots.exe

Step 6

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