PLATFORM:

Windows

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

  • Threat Type: Potentially Unwanted Application

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Potentially Unwanted Application 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: 285,432 bytes
File Type: DLL
Memory Resident: Yes
Initial Samples Received Date: 27 Feb 2020

Arrival Details

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

Other System Modifications

This Potentially Unwanted Application modifies the following file(s):

  • %Windows%\win.ini

(Note: %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Wow6432Node\CLSID\{5A4E3A41-FA55-4BDA-AED7-CEBE6E7BCB52}
(Default) = "Manager Class"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Wow6432Node\CLSID\{5A4E3A41-FA55-4BDA-AED7-CEBE6E7BCB52}\
InprocServer32
(Default) = "%User Temp%\{malware file name}.dll"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Wow6432Node\CLSID\{5A4E3A41-FA55-4BDA-AED7-CEBE6E7BCB52}\
InprocServer32
ThreadingModel = "Apartment"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Wow6432Node\CLSID\{5A4E3A41-FA55-4BDA-AED7-CEBE6E7BCB52}\
TypeLib
(Default) = "{A2D733A7-73B0-4C6B-B0C7-06A432950B66}"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Wow6432Node\CLSID\{5A4E3A41-FA55-4BDA-AED7-CEBE6E7BCB52}\
Version
(Default) = "1.0"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Wow6432Node\Interface\{FC073BDA-C115-4A1D-9DF9-9B5C461482E5}
(Default) = "IMdt"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Wow6432Node\Interface\{FC073BDA-C115-4A1D-9DF9-9B5C461482E5}\
ProxyStubClsid32
(Default) = "{00020424-0000-0000-C000-000000000046}"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Wow6432Node\Interface\{FC073BDA-C115-4A1D-9DF9-9B5C461482E5}\
TypeLib
(Default) = "{A2D733A7-73B0-4C6B-B0C7-06A432950B66}"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Wow6432Node\Interface\{FC073BDA-C115-4A1D-9DF9-9B5C461482E5}\
TypeLib
Version = "1.0"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Wow6432Node\Interface\{4E6354DE-9115-4AEE-BD21-C46C3E8A49DB}
(Default) = "IManager"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Wow6432Node\Interface\{4E6354DE-9115-4AEE-BD21-C46C3E8A49DB}\
ProxyStubClsid32
(Default) = "{00020424-0000-0000-C000-000000000046}"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Wow6432Node\Interface\{4E6354DE-9115-4AEE-BD21-C46C3E8A49DB}\
TypeLib
(Default) = "{A2D733A7-73B0-4C6B-B0C7-06A432950B66}"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Wow6432Node\Interface\{4E6354DE-9115-4AEE-BD21-C46C3E8A49DB}\
TypeLib
Version = "1.0"

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine: 9.850

Step 1

Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 users must disable System Restore to allow full scanning of their computers.

Step 2

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\Classes\Wow6432Node\CLSID\{5A4E3A41-FA55-4BDA-AED7-CEBE6E7BCB52}
    • (Default) = "Manager Class"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{5A4E3A41-FA55-4BDA-AED7-CEBE6E7BCB52}\InprocServer32
    • (Default) = "%User Temp%\{malware file name}.dll"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{5A4E3A41-FA55-4BDA-AED7-CEBE6E7BCB52}\InprocServer32
    • ThreadingModel = "Apartment"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{5A4E3A41-FA55-4BDA-AED7-CEBE6E7BCB52}\TypeLib
    • (Default) = "{A2D733A7-73B0-4C6B-B0C7-06A432950B66}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{5A4E3A41-FA55-4BDA-AED7-CEBE6E7BCB52}\Version
    • (Default) = "1.0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Wow6432Node\Interface\{FC073BDA-C115-4A1D-9DF9-9B5C461482E5}
    • (Default) = "IMdt"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Wow6432Node\Interface\{FC073BDA-C115-4A1D-9DF9-9B5C461482E5}\ProxyStubClsid32
    • (Default) = "{00020424-0000-0000-C000-000000000046}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Wow6432Node\Interface\{FC073BDA-C115-4A1D-9DF9-9B5C461482E5}\TypeLib
    • (Default) = "{A2D733A7-73B0-4C6B-B0C7-06A432950B66}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Wow6432Node\Interface\{FC073BDA-C115-4A1D-9DF9-9B5C461482E5}\TypeLib
    • Version = "1.0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Wow6432Node\Interface\{4E6354DE-9115-4AEE-BD21-C46C3E8A49DB}
    • (Default) = "IManager"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Wow6432Node\Interface\{4E6354DE-9115-4AEE-BD21-C46C3E8A49DB}\ProxyStubClsid32
    • (Default) = "{00020424-0000-0000-C000-000000000046}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Wow6432Node\Interface\{4E6354DE-9115-4AEE-BD21-C46C3E8A49DB}\TypeLib
    • (Default) = "{A2D733A7-73B0-4C6B-B0C7-06A432950B66}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Wow6432Node\Interface\{4E6354DE-9115-4AEE-BD21-C46C3E8A49DB}\TypeLib
    • Version = "1.0"

Step 3

Scan your computer with your Trend Micro product to delete files detected as PUA_BROWSEFOX.SMB. 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 the following Trend Micro Support pages for more information:

Step 4

Restore deleted/modified files and/or registry entries from backup

*Note: Only Microsoft-related files/keys/values will be restored. If this malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.

    • %Windows%\win.ini


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