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TROJ_BHO.YR

October 08, 2012
 Analysis by: Sabrina Lei Sioting
 PLATFORM:

Windows 98, ME, NT, 2000, XP, Server 2003

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


This Trojan may arrive bundled with malware packages as a malware component. It may be downloaded unknowingly by a user when visiting malicious website(s).

  TECHNICAL DETAILS

File Size:

303,117 bytes

File Type:

DLL

Memory Resident:

Yes

Arrival Details

This Trojan may arrive bundled with malware packages as a malware component.

It may be downloaded unknowingly by a user when visiting the following malicious website(s):

Autostart Technique

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Browser Helper Objects\{AFD4AD01-58C1-47DB-A404-FBE00A6C5486}
NoExplorer = 1

  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

Restart in Safe Mode

[ Learn More ]

Step 3

Close all opened browser windows

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\Classes\CLSID\
    • {AFD4AD01-58C1-47DB-A404-FBE00A6C5486}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\main.BHO.1\CLSID
    • @={AFD4AD01-58C1-47DB-A404-FBE00A6C5486}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\main.BHO\CLSID
    • @={AFD4AD01-58C1-47DB-A404-FBE00A6C5486}
  • In HKEY_CLASSES_ROOT\CLSID\
    • {AFD4AD01-58C1-47DB-A404-FBE00A6C5486}
  • In HKEY_CLASSES_ROOT\main.BHO.1\CLSID
    • @={AFD4AD01-58C1-47DB-A404-FBE00A6C5486}
  • In HKEY_CLASSES_ROOT\main.BHO\CLSID
    • @={AFD4AD01-58C1-47DB-A404-FBE00A6C5486}

Step 5

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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects\{AFD4AD01-58C1-47DB-A404-FBE00A6C5486}
    • NoExplorer=1

Step 6

Scan your computer with your Trend Micro product to delete files detected as TROJ_BHO.YR. 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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