ADW_EXTENBRO
Windows
Threat Type: Adware
Destructiveness: No
Encrypted:
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
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.
Installation
This adware drops the following copies of itself into the affected system:
- %User Temp%\uninstlr26966\uninst.exe
(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)
It creates the following folders:
- %User Temp%\uninstlr26966
- %System Root%\ProgramData
(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.. %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)
Other System Modifications
This adware adds the following registry keys:
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\LowRegistry\CommandBar
It deletes the following registry keys:
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Recovery\AdminActive
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Recovery\Active
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{6E727987-C8EA-44DA-8749-310C0FBE3C3E}
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Browser Helper Objects\{6E727987-C8EA-44DA-8749-310C0FBE3C3E}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{03AE1B7B-A9E7-4D5A-9D34-89999C31B659}
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Internet Explorer\Extensions\{03AE1B7B-A9E7-4D5A-9D34-89999C31B659}
HKEY_LOCAL_MACHINE\Software\Mozilla\
Firefox\Extensions\{6E727987-C8EA-44DA-8749-310C0FBE3C3E}
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Torrent Search
Dropping Routine
This adware drops the following files:
- %User Temp%\uninstlr26966\VsuhDd9.dll
- %User Temp%\uninstlr26966\Chromium.dll
- %User Temp%\uninstlr26966\nspr4.dll
- %User Temp%\uninstlr26966\nss3.dll
- %User Temp%\uninstlr26966\nssutil3.dll
- %User Temp%\uninstlr26966\plc4.dll
- %User Temp%\uninstlr26966\plds4.dll
- %User Temp%\uninstlr26966\softokn3.dll
- %User Temp%\uninstlr26966\freebl3.dll
- %User Temp%\uninstlr26966\sqlite3.dll
(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)
Other Details
This adware connects to the following possibly malicious URL:
- http://api.{BLOCKED}i.info/{random path}
This report is generated via an automated analysis system.
SOLUTION
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
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_CURRENT_USER\Software\Microsoft\Internet Explorer\LowRegistry
- CommandBar
Step 3
Search and delete these components
- %User Temp%\uninstlr26966\VsuhDd9.dll
- %User Temp%\uninstlr26966\Chromium.dll
- %User Temp%\uninstlr26966\nspr4.dll
- %User Temp%\uninstlr26966\nss3.dll
- %User Temp%\uninstlr26966\nssutil3.dll
- %User Temp%\uninstlr26966\plc4.dll
- %User Temp%\uninstlr26966\plds4.dll
- %User Temp%\uninstlr26966\softokn3.dll
- %User Temp%\uninstlr26966\freebl3.dll
- %User Temp%\uninstlr26966\sqlite3.dll
Step 4
Search and delete these folders
- %User Temp%\uninstlr26966
- %System Root%\ProgramData
Step 5
Scan your computer with your Trend Micro product to delete files detected as ADW_EXTENBRO. 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.
Step 6
Restore these deleted registry keys/values from backup
*Note: Only Microsoft-related keys/values will be restored. If the malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Recovery
- AdminActive
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Recovery
- Active
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID
- {6E727987-C8EA-44DA-8749-310C0FBE3C3E}
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects
- {6E727987-C8EA-44DA-8749-310C0FBE3C3E}
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID
- {03AE1B7B-A9E7-4D5A-9D34-89999C31B659}
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Extensions
- {03AE1B7B-A9E7-4D5A-9D34-89999C31B659}
- In HKEY_LOCAL_MACHINE\Software\Mozilla\Firefox\Extensions
- {6E727987-C8EA-44DA-8749-310C0FBE3C3E}
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall
- Torrent Search
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