TROJ_AGENT.BF


 ALIASES:

Adware:Win32/Windupdates (Microsoft); [00027754.EXE]:Adware-WinAd., [0001b954.EXE\0001b954.EXE]:Adware-WinAd., [000124b8.EXE\000124b8.EXE] (McAfee); Packed.Win32.CryptExe.gen (Kaspersky); WindUpdates.MediaAccess, WinAD Client, Backdoor.Poebot (fs) (Sunbelt); MemScan:Adware.Generic.32318 (FSecure)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


This Trojan 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:

279,639 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

20 Sep 2012

Arrival Details

This Trojan 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 Trojan creates the following folders:

  • %Program Files%\Media Access

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.)

Autostart Technique

This Trojan adds the following registry entries to enable its automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
Media Access = "%Program Files%\Media Access\MediaAccK.exe"

Other System Modifications

This Trojan adds the following registry keys:

HKEY_LOCAL_MACHINE\Software\Media Access

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
AppID\{735C5A0C-F79F-47A1-8CA1-2A2E482662A8}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
AppID\LoaderX.EXE

HKEY_CLASSES_ROOT\MediaAccess.Installer

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
MediaAccess.Installer\CLSID

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
MediaAccess.Installer\CurVer

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{1E5F0D38-214B-4085-AD2A-D2290E6A2D2C}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{1E5F0D38-214B-4085-AD2A-D2290E6A2D2C}\ProgID

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{1E5F0D38-214B-4085-AD2A-D2290E6A2D2C}\VersionIndependentProgID

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{1E5F0D38-214B-4085-AD2A-D2290E6A2D2C}\Programmable

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{1E5F0D38-214B-4085-AD2A-D2290E6A2D2C}\LocalServer32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{1E5F0D38-214B-4085-AD2A-D2290E6A2D2C}\TypeLib

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{1E5F0D38-214B-4085-AD2A-D2290E6A2D2C}\Implemented Categories

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{1E5F0D38-214B-4085-AD2A-D2290E6A2D2C}\Implemented Categories\
{7DD95801-9882-11CF-9FA9-00AA006C42C4}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{1E5F0D38-214B-4085-AD2A-D2290E6A2D2C}\Implemented Categories\
{7DD95802-9882-11CF-9FA9-00AA006C42C4}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{15696AE2-6EA4-47F4-BEA6-A3D32693EFC7}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{15696AE2-6EA4-47F4-BEA6-A3D32693EFC7}\1.0

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{15696AE2-6EA4-47F4-BEA6-A3D32693EFC7}\1.0\
FLAGS

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{15696AE2-6EA4-47F4-BEA6-A3D32693EFC7}\1.0\
0

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{15696AE2-6EA4-47F4-BEA6-A3D32693EFC7}\1.0\
0\win32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{15696AE2-6EA4-47F4-BEA6-A3D32693EFC7}\1.0\
HELPDIR

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{00ADA225-EA6C-4FB3-82E8-68189201CCB9}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{00ADA225-EA6C-4FB3-82E8-68189201CCB9}\ProxyStubClsid

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{00ADA225-EA6C-4FB3-82E8-68189201CCB9}\ProxyStubClsid32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{00ADA225-EA6C-4FB3-82E8-68189201CCB9}\TypeLib

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Media Access

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Media Access
track = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
AppID\LoaderX.EXE
AppID = "{735C5A0C-F79F-47A1-8CA1-2A2E482662A8}"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{1E5F0D38-214B-4085-AD2A-D2290E6A2D2C}
AppID = "{735C5A0C-F79F-47A1-8CA1-2A2E482662A8}"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{00ADA225-EA6C-4FB3-82E8-68189201CCB9}\TypeLib
Version = "1.0"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Media Access
UninstallString = "%Program Files%\Media Access\MediaAccess.exe /Remove"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Media Access
DisplayName = "Media Access"

Dropping Routine

This Trojan drops the following files:

  • %Program Files%\Media Access\MediaAccC.dll
  • %Program Files%\Media Access\MediaAccK.exe
  • %Program Files%\Media Access\Info.txt
  • %Program Files%\Media Access\MediaAccess.exe
  • %System%\ide21201.vxd

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.. %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.200

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

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
    • Media Access
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\AppID
    • {735C5A0C-F79F-47A1-8CA1-2A2E482662A8}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\AppID
    • LoaderX.EXE
  • In HKEY_CLASSES_ROOT
    • MediaAccess.Installer
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\MediaAccess.Installer
    • CLSID
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\MediaAccess.Installer
    • CurVer
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID
    • {1E5F0D38-214B-4085-AD2A-D2290E6A2D2C}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{1E5F0D38-214B-4085-AD2A-D2290E6A2D2C}
    • ProgID
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{1E5F0D38-214B-4085-AD2A-D2290E6A2D2C}
    • VersionIndependentProgID
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{1E5F0D38-214B-4085-AD2A-D2290E6A2D2C}
    • Programmable
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{1E5F0D38-214B-4085-AD2A-D2290E6A2D2C}
    • LocalServer32
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{1E5F0D38-214B-4085-AD2A-D2290E6A2D2C}
    • TypeLib
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{1E5F0D38-214B-4085-AD2A-D2290E6A2D2C}
    • Implemented Categories
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{1E5F0D38-214B-4085-AD2A-D2290E6A2D2C}\Implemented Categories
    • {7DD95801-9882-11CF-9FA9-00AA006C42C4}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{1E5F0D38-214B-4085-AD2A-D2290E6A2D2C}\Implemented Categories
    • {7DD95802-9882-11CF-9FA9-00AA006C42C4}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib
    • {15696AE2-6EA4-47F4-BEA6-A3D32693EFC7}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{15696AE2-6EA4-47F4-BEA6-A3D32693EFC7}
    • 1.0
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{15696AE2-6EA4-47F4-BEA6-A3D32693EFC7}\1.0
    • FLAGS
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{15696AE2-6EA4-47F4-BEA6-A3D32693EFC7}\1.0
    • 0
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{15696AE2-6EA4-47F4-BEA6-A3D32693EFC7}\1.0\0
    • win32
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{15696AE2-6EA4-47F4-BEA6-A3D32693EFC7}\1.0
    • HELPDIR
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface
    • {00ADA225-EA6C-4FB3-82E8-68189201CCB9}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{00ADA225-EA6C-4FB3-82E8-68189201CCB9}
    • ProxyStubClsid
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{00ADA225-EA6C-4FB3-82E8-68189201CCB9}
    • ProxyStubClsid32
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{00ADA225-EA6C-4FB3-82E8-68189201CCB9}
    • TypeLib
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall
    • Media Access

Step 4

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\Run
    • Media Access = "%Program Files%\Media Access\MediaAccK.exe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Media Access
    • track = "1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\AppID\LoaderX.EXE
    • AppID = "{735C5A0C-F79F-47A1-8CA1-2A2E482662A8}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{1E5F0D38-214B-4085-AD2A-D2290E6A2D2C}
    • AppID = "{735C5A0C-F79F-47A1-8CA1-2A2E482662A8}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{00ADA225-EA6C-4FB3-82E8-68189201CCB9}\TypeLib
    • Version = "1.0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Media Access
    • UninstallString = "%Program Files%\Media Access\MediaAccess.exe /Remove"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Media Access
    • DisplayName = "Media Access"

Step 5

Search and delete these files

[ Learn More ]
There may be some component files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
  • %Program Files%\Media Access\MediaAccC.dll
  • %Program Files%\Media Access\MediaAccK.exe
  • %Program Files%\Media Access\Info.txt
  • %Program Files%\Media Access\MediaAccess.exe
  • %System%\ide21201.vxd

Step 6

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.
  • %Program Files%\Media Access

Step 7

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_AGENT.BF. 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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