WORM_VOBFUS.AP


 PLATFORM:

Windows 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 .LNK files to all removable drives, which are shortcut files to the dropped copy of this worm. It does this to automatically run the worm copy whenever the removable drives are accessed.

This worm may be dropped by other malware. It 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.

It connects to a website to send and receive information.

  TECHNICAL DETAILS

File Size:

311,300 bytes

File Type:

PE

Memory Resident:

Yes

Initial Samples Received Date:

12 Nov 2010

Payload:

Connects to URLs/Ips

Arrival Details

This worm may be dropped by other malware.

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

Installation

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

  • %User Profile%\{random name}.exe

(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)

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
{malware name} = %User Profile%\{random name}.exe

Other System Modifications

This worm modifies the following registry entries to hide files with Hidden attributes:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
ShowSuperHidden = 0

(Note: The default value data of the said registry entry is 1.)

Propagation

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

  • juadium.exe
  • juadiumx.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]
AVtIon=Open folder to view files
ShELLEXecuTE=juADIUm.eXE
ICOn=%SystEMrOot%\sYStEM32\sHelL32.dLL,4
USeAutoplAy=1

Backdoor Routine

This worm connects to the following websites to send and receive information:

  • ns1.{BLOCKED}online.biz

Other Details

This worm does the following:

  • It also drops the following lnk files to all removable drives which are shortcut files to the dropped copy:
  • Documents.lnk
  • Music.lnk
  • New Folder.lnk
  • Passwords.lnk
  • Pictures.lnk
  • Video.lnk

  SOLUTION

Minimum Scan Engine:

8.900

FIRST VSAPI PATTERN FILE:

7.614.09

FIRST VSAPI PATTERN DATE:

12 Nov 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

Identify and terminate files detected as WORM_VOBFUS.AP

[ Learn More ]
  1. 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.
  2. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

Step 3

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
    • {malware name} = %User Profile%\{random name}.exe

Step 4

Restore this modified 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\Explorer\Advanced
    • From: ShowSuperHidden = 0
      To: 1

Step 5

Search and delete these files

[ 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. Documents.lnk
Music.lnk
New Folder.lnk
Passwords.lnk
Pictures.lnk
Video.lnk

Step 6

Search and delete AUTORUN.INF files created by WORM_VOBFUS.AP that contain these strings

[ Learn More ]
[autORUN]
AVtIon=Open folder to view files
ShELLEXecuTE=juADIUm.eXE
ICOn=%SystEMrOot%\sYStEM32\sHelL32.dLL,4
USeAutoplAy=1

Step 7

Scan your computer with your Trend Micro product to delete files detected as WORM_VOBFUS.AP. 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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