ADW_BHO

 Modified by: Nikko Tamana

 ALIASES:

Trojan.Win32.BHO.bodx (Kaspersky); W32/BHO.BODX!tr (Fortinet); Trojan.Win32.BHO (Ikarus)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 OVERALL RISK RATING:
 REPORTED INFECTION:
 SYSTEM IMPACT RATING:
 INFORMATION EXPOSURE:

  • Threat Type: Adware

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW


This adware arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

  TECHNICAL DETAILS

File Size:

68,096 bytes

File Type:

DLL

Memory Resident:

Yes

Initial Samples Received Date:

29 Aug 2011

Arrival Details

This adware arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Autostart Technique

This adware adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CLASSES_ROOT\CLSID\{C881E764-E445-4EAC-9480-898E25DAEE3B}\
InprocServer32
(default) = "{malware path and file name}"

It registers itself as a BHO to ensure its automatic execution every time Internet Explorer is used by adding the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Browser Helper Objects\{C881E764-E445-4EAC-9480-898E25DAEE3B}

Other System Modifications

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

HKEY_CLASSES_ROOT\MediaMonitor.MediaPlay

HKEY_CLASSES_ROOT\MediaMonitor.MediaPlay.1

HKEY_CLASSES_ROOT\CLSID\{C881E764-E445-4EAC-9480-898E25DAEE3B}

HKEY_CLASSES_ROOT\Interface\{0DACF5D7-F1C0-4A37-B2A9-E03A9FBEB426}

HKEY_CLASSES_ROOT\TypeLib\{0E05704B-07AB-41EB-8A17-F007AFBB5AA5}

Other Details

This adware connects to the following possibly malicious URL:

  • http://www.{BLOCKED}abys.com

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

1.210.19

FIRST VSAPI PATTERN DATE:

29 Aug 2011

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Scan your computer with your Trend Micro product and note files detected as ADW_BHO

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. 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_CLASSES_ROOT
    • MediaMonitor.MediaPlay
  • In HKEY_CLASSES_ROOT
    • MediaMonitor.MediaPlay.1
  • In HKEY_CLASSES_ROOT\CLSID
    • {C881E764-E445-4EAC-9480-898E25DAEE3B}
  • In HKEY_CLASSES_ROOT\Interface
    • {0DACF5D7-F1C0-4A37-B2A9-E03A9FBEB426}
  • In HKEY_CLASSES_ROOT\TypeLib
    • {0E05704B-07AB-41EB-8A17-F007AFBB5AA5}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects
    • {C881E764-E445-4EAC-9480-898E25DAEE3B}

Step 5

Search and delete the files detected as ADW_BHO

*Note: Some component files may be 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.

To stop the malware/grayware from running when certain files are opened:

For Windows 2000, Windows XP, and Windows Server 2003:

  1. Right-click Start then click Search....
  2. In the Named input box, type the name of the file that was detected earlier.
  3. In the Look In drop-down list, select My Computer then press Enter.
  4. Once located, select the file then press SHIFT+DELETE to delete it.

For Windows Vista and Windows 7:

  1. Click Start>Computer.
  2. In the Search Computer input box, type the name of the file detected earlier, and press Enter.
  3. Once located, select the file then press SHIFT+DELETE to delete it.
    *Note: Read the following Microsoft page if these steps do not work on Windows 7.

Step 6

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