ALIASES:

HEUR:AdWare.Win32.EverFresh.gen (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt)

 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: 550,016 bytes
File Type: DLL
Memory Resident: Yes
Initial Samples Received Date: 31 Jan 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.

Installation

This Potentially Unwanted Application creates the following folders:

  • %AppDataLocal%Low\{malware file name}

(Note: %AppDataLocal% is the Local Application Data folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

Autostart Technique

This Potentially Unwanted Application 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\{480B86B9-0923-4886-A944-00E9F00AEDED}

Other System Modifications

This Potentially Unwanted Application adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Wow6432Node\CLSID\{480B86B9-0923-4886-A944-00E9F00AEDED}
(Default) = "-----Menu bar name--------------------------------"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Wow6432Node\CLSID\{480B86B9-0923-4886-A944-00E9F00AEDED}\
InprocServer32
(Default) = "%User Temp%\{malware file name}.dll"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Wow6432Node\CLSID\{480B86B9-0923-4886-A944-00E9F00AEDED}\
InprocServer32
ThreadingModel = "Apartment"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Wow6432Node\CLSID\{480B86B9-0923-4886-A944-00E9F00AEDED}\
ToolboxBitmap32
(Default) = "%User Temp%\{malware file name}.dll, 102"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Wow6432Node\CLSID\{480B86B9-0923-4886-A944-00E9F00AEDED}\
MiscStatus
(Default) = "0"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Wow6432Node\CLSID\{480B86B9-0923-4886-A944-00E9F00AEDED}\
MiscStatus\1
(Default) = "131473"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Wow6432Node\CLSID\{480B86B9-0923-4886-A944-00E9F00AEDED}\
Version
(Default) = "1.0"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Wow6432Node\Interface\{ADF90832-DC6F-4279-BBBF-ECED4AE49CCB}
(Default) = "IDTBandObj"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Wow6432Node\Interface\{ADF90832-DC6F-4279-BBBF-ECED4AE49CCB}\
ProxyStubClsid32
(Default) = "{00020424-0000-0000-C000-000000000046}"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Wow6432Node\Interface\{ADF90832-DC6F-4279-BBBF-ECED4AE49CCB}\
TypeLib
(Default) = "{589D05E8-C059-4057-9627-469021A8B825}"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Wow6432Node\Interface\{ADF90832-DC6F-4279-BBBF-ECED4AE49CCB}\
TypeLib
Version = "1.0"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Wow6432Node\Interface\{7F061AD0-A505-4289-9F31-40F93E010204}
(Default) = "IUIDTBandObj"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Wow6432Node\Interface\{7F061AD0-A505-4289-9F31-40F93E010204}\
ProxyStubClsid32
(Default) = "{00020424-0000-0000-C000-000000000046}"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Wow6432Node\Interface\{7F061AD0-A505-4289-9F31-40F93E010204}\
TypeLib
(Default) = "{589D05E8-C059-4057-9627-469021A8B825}"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Wow6432Node\Interface\{7F061AD0-A505-4289-9F31-40F93E010204}\
TypeLib
Version = "1.0"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Wow6432Node\Interface\{999E3BA5-66A0-4D28-BEA2-85C2D512577D}
(Default) = "_IDTFrameworkEvents"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Wow6432Node\Interface\{999E3BA5-66A0-4D28-BEA2-85C2D512577D}\
ProxyStubClsid32
(Default) = "{00020420-0000-0000-C000-000000000046}"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Wow6432Node\Interface\{999E3BA5-66A0-4D28-BEA2-85C2D512577D}\
TypeLib
(Default) = "{589D05E8-C059-4057-9627-469021A8B825}"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Wow6432Node\Interface\{999E3BA5-66A0-4D28-BEA2-85C2D512577D}\
TypeLib
Version = "1.0"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Internet Explorer\Toolbar
{480B86B9-0923-4886-A944-00E9F00AEDED} = ""

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Ext\PreApproved\{480B86B9-0923-4886-A944-00E9F00AEDED}
(Default) = ""

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

Close all opened browser windows

Step 3

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\{480B86B9-0923-4886-A944-00E9F00AEDED}
    • (Default) = "-----Menu bar name--------------------------------"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{480B86B9-0923-4886-A944-00E9F00AEDED}\InprocServer32
    • (Default) = "%User Temp%\{malware file name}.dll"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{480B86B9-0923-4886-A944-00E9F00AEDED}\InprocServer32
    • ThreadingModel = "Apartment"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{480B86B9-0923-4886-A944-00E9F00AEDED}\ToolboxBitmap32
    • (Default) = "%User Temp%\{malware file name}.dll, 102"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{480B86B9-0923-4886-A944-00E9F00AEDED}\MiscStatus
    • (Default) = "0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{480B86B9-0923-4886-A944-00E9F00AEDED}\MiscStatus\1
    • (Default) = "131473"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{480B86B9-0923-4886-A944-00E9F00AEDED}\Version
    • (Default) = "1.0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Wow6432Node\Interface\{ADF90832-DC6F-4279-BBBF-ECED4AE49CCB}
    • (Default) = "IDTBandObj"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Wow6432Node\Interface\{ADF90832-DC6F-4279-BBBF-ECED4AE49CCB}\ProxyStubClsid32
    • (Default) = "{00020424-0000-0000-C000-000000000046}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Wow6432Node\Interface\{ADF90832-DC6F-4279-BBBF-ECED4AE49CCB}\TypeLib
    • (Default) = "{589D05E8-C059-4057-9627-469021A8B825}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Wow6432Node\Interface\{ADF90832-DC6F-4279-BBBF-ECED4AE49CCB}\TypeLib
    • Version = "1.0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Wow6432Node\Interface\{7F061AD0-A505-4289-9F31-40F93E010204}
    • (Default) = "IUIDTBandObj"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Wow6432Node\Interface\{7F061AD0-A505-4289-9F31-40F93E010204}\ProxyStubClsid32
    • (Default) = "{00020424-0000-0000-C000-000000000046}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Wow6432Node\Interface\{7F061AD0-A505-4289-9F31-40F93E010204}\TypeLib
    • (Default) = "{589D05E8-C059-4057-9627-469021A8B825}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Wow6432Node\Interface\{7F061AD0-A505-4289-9F31-40F93E010204}\TypeLib
    • Version = "1.0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Wow6432Node\Interface\{999E3BA5-66A0-4D28-BEA2-85C2D512577D}
    • (Default) = "_IDTFrameworkEvents"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Wow6432Node\Interface\{999E3BA5-66A0-4D28-BEA2-85C2D512577D}\ProxyStubClsid32
    • (Default) = "{00020420-0000-0000-C000-000000000046}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Wow6432Node\Interface\{999E3BA5-66A0-4D28-BEA2-85C2D512577D}\TypeLib
    • (Default) = "{589D05E8-C059-4057-9627-469021A8B825}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Wow6432Node\Interface\{999E3BA5-66A0-4D28-BEA2-85C2D512577D}\TypeLib
    • Version = "1.0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Internet Explorer\Toolbar
    • {480B86B9-0923-4886-A944-00E9F00AEDED} = ""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Ext\PreApproved\{480B86B9-0923-4886-A944-00E9F00AEDED}
    • (Default) = ""

Step 4

Search and delete this folder

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %AppDataLocal%Low\{malware file name}

Step 5

Scan your computer with your Trend Micro product to delete files detected as PUA.Win32.BTToolbar.AA. 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:


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