TROJ_BHO.YR
Windows 98, ME, NT, 2000, XP, Server 2003
![](/vinfo/imgFiles/legend.jpg)
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
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
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
Step 3
Close all opened browser windows
Step 4
Delete this registry key
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}
- {AFD4AD01-58C1-47DB-A404-FBE00A6C5486}
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\main.BHO.1\CLSID
- @={AFD4AD01-58C1-47DB-A404-FBE00A6C5486}
- @={AFD4AD01-58C1-47DB-A404-FBE00A6C5486}
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\main.BHO\CLSID
- @={AFD4AD01-58C1-47DB-A404-FBE00A6C5486}
- @={AFD4AD01-58C1-47DB-A404-FBE00A6C5486}
- In HKEY_CLASSES_ROOT\CLSID\
- {AFD4AD01-58C1-47DB-A404-FBE00A6C5486}
- {AFD4AD01-58C1-47DB-A404-FBE00A6C5486}
- In HKEY_CLASSES_ROOT\main.BHO.1\CLSID
- @={AFD4AD01-58C1-47DB-A404-FBE00A6C5486}
- @={AFD4AD01-58C1-47DB-A404-FBE00A6C5486}
- In HKEY_CLASSES_ROOT\main.BHO\CLSID
- @={AFD4AD01-58C1-47DB-A404-FBE00A6C5486}
- @={AFD4AD01-58C1-47DB-A404-FBE00A6C5486}
Step 5
Delete this registry value
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
- 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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