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WORM_HENBANG.AF

October 08, 2012
 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 drops copies of itself in removable drives. These dropped copies use the names of the folders located on the said drives for their file names.

  TECHNICAL DETAILS

File Size:

431616 bytes

File Type:

PE

Memory Resident:

No

Initial Samples Received Date:

16 Jun 2010

Payload:

Drops files

Installation

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

  • %System%\web.dat
  • %System%\winweb.exe

(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)

It drops the following file(s)/component(s):

  • %System%\webad.dll - detected by Trend Micro as ADWARE_HENBANG
  • %System%\iconhandle.dll - detected by Trend Micro as ADWARE_HENBANG

(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)

Propagation

This worm drops copies of itself in removable drives. These dropped copies use the names of the folders located on the said drives for their file names.

  SOLUTION

Minimum Scan Engine:

8.900

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_HENBANG.AF

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

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\Windows\CurrentVersion\Explorer\Browser Helper Objects
    • {73EF2588-E4D1-4623-9B45-E0BBD6B65E9C}
  • In HKEY_CLASSES_ROOT
    • ad.h
  • In HKEY_CLASSES_ROOT
    • iconhandle.seticon
  • In HKEY_CLASSES_ROOT\AppID
    • ad.DLL
  • In HKEY_CLASSES_ROOT\AppID
    • iconhandle.DLL
  • In HKEY_CLASSES_ROOT\txtfile
    • shellEx

Step 5

Restart in normal mode and scan your computer with your Trend Micro product for files detected as WORM_HENBANG.AF. 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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