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Adware.Win32.NaviHelper.A

April 18, 2024
 Analysis by: Raymart Christian Yambot
 PLATFORM:

Windows

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

  • Threat Type: Adware

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware

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

File Size:

377,928 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

18 Apr 2024

Payload:

Drops files, Modifies system registry

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 files:

  • %User Temp%\mmsetup{Random number}.exe
  • %User Temp%\DLMUpdateCtrl.xml
  • %User Temp%\install.ini
  • %User Temp%\MMJBUpdateCtrl.xml
  • %User Temp%\MMUpdateMgr.dat
  • %User Temp%\MMUpdateMgr.exe
  • %User Temp%\MMUpdateMgrSetup.exe
  • %User Temp%\mrbupd.dll
  • %User Temp%\properties.txt
  • %User Temp%\unpublished.ini
  • %User Temp%\VersionInfo.xml
  • %Program Files%\Musicmatch\Musicmatch Update\MMUpdate.log
  • %Program Files%\Musicmatch\Musicmatch Update\DLM\.castanet\properties.txt
  • %Program Files%\Musicmatch\Musicmatch Update\DLM\.castanet\index.mrb
  • %Program Files%\Musicmatch\Musicmatch Update\MMJB\.castanet\properties.txt
  • %Program Files%\Musicmatch\Musicmatch Update\MMJB\.castanet\index.mrb
  • %System Root%\Users\Public\Desktop\download Jukebox.lnk
  • %Program Files%\Musicmatch\Musicmatch Update\MMUpdateMgr.dat
  • %Program Files%\Musicmatch\Musicmatch Update\mrbupd.dll
  • %Program Files%\Musicmatch\Musicmatch Update\MMUpdateMgr.exe
  • %Program Files%\Musicmatch\Musicmatch Update\DLM\mrbupd.dll
  • %Program Files%\Musicmatch\Musicmatch Update\DLM\MMUpdateMgr.exe
  • %Program Files%\Musicmatch\Musicmatch Update\DLM\install.ini
  • %Program Files%\Musicmatch\Musicmatch Update\DLM\MMUpdateMgrSetup.exe
  • %Program Files%\Musicmatch\Musicmatch Update\DLM\VersionInfo.xml
  • %Program Files%\Musicmatch\Musicmatch Update\DLM\properties.txt
  • %Program Files%\Musicmatch\Musicmatch Update\DLMUpdateCtrl.xml
  • %Program Files%\Musicmatch\Musicmatch Update\MMJBUpdateCtrl.xml

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000(32-bit), Server 2003(32-bit), XP, Vista(64-bit), 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit) , or C:\Program Files (x86) in Windows XP(64-bit), Vista(64-bit), 7(64-bit), 8(64-bit), 8.1(64-bit), 2008(64-bit), 2012(64-bit) and 10(64-bit).. %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)

It adds the following processes:

  • %User Temp%\mmsetup{Random number}.exe
  • %User Temp%\MMUPDA~2.EXE -manualupdate DLM MMJB
  • %Program Files%\Musicmatch\Musicmatch Update\MMUpdateMgr.exe -manualupdate DLM MMJB

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000(32-bit), Server 2003(32-bit), XP, Vista(64-bit), 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit) , or C:\Program Files (x86) in Windows XP(64-bit), Vista(64-bit), 7(64-bit), 8(64-bit), 8.1(64-bit), 2008(64-bit), 2012(64-bit) and 10(64-bit).)

Other System Modifications

This Adware adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\MusicMatch
download = %User Temp%\{Malware file name}

HKEY_LOCAL_MACHINE\SOFTWARE\MusicMatch\
Musicmatch Update
Path = %Program Files%\Musicmatch\Musicmatch Update

HKEY_LOCAL_MACHINE\SOFTWARE\MusicMatch\
Musicmatch Update
OEM = MMD

HKEY_LOCAL_MACHINE\SOFTWARE\MusicMatch\
Musicmatch Update
Lang = DEU

HKEY_LOCAL_MACHINE\SOFTWARE\MusicMatch\
Musicmatch Update
mmuid = {GUID}

HKEY_LOCAL_MACHINE\SOFTWARE\MusicMatch\
Musicmatch Update\Subscriptions\DLM
UpdateStatus = 0

HKEY_LOCAL_MACHINE\SOFTWARE\MusicMatch\
Musicmatch Update\Subscriptions\DLM
ChannelDir = %Program Files%\Musicmatch\Musicmatch Update\DLM

HKEY_LOCAL_MACHINE\SOFTWARE\MusicMatch\
Musicmatch Update\Subscriptions\MMJB
UpdateStatus = 0

HKEY_LOCAL_MACHINE\SOFTWARE\MusicMatch\
Musicmatch Update\Subscriptions\MMJB
ChannelDir = %Program Files%\Musicmatch\Musicmatch Update\MMJB

HKEY_LOCAL_MACHINE\SOFTWARE\MusicMatch\
Musicmatch Update\Subscriptions\DLM
UpdateStatus = 2

HKEY_LOCAL_MACHINE\SOFTWARE\MusicMatch\
Musicmatch Update\Subscriptions\MMJB
UpdateStatus = 2

It adds the following registry keys as part of its installation routine:

HKEY_LOCAL_MACHINE\SOFTWARE\MusicMatch

HKEY_LOCAL_MACHINE\SOFTWARE\MusicMatch\
download

HKEY_LOCAL_MACHINE\software\Musicmatch\
Musicmatch Update

HKEY_LOCAL_MACHINE\SOFTWARE\MusicMatch\
Musicmatch Update\Path

HKEY_LOCAL_MACHINE\SOFTWARE\MusicMatch\
Musicmatch Update\OEM

HKEY_LOCAL_MACHINE\SOFTWARE\MusicMatch\
Musicmatch Update\Lang

HKEY_LOCAL_MACHINE\SOFTWARE\MusicMatch\
Musicmatch Update\mmuid

HKEY_LOCAL_MACHINE\software\Musicmatch\
Musicmatch Update\Subscriptions

HKEY_LOCAL_MACHINE\software\Musicmatch\
Musicmatch Update\Subscriptions\DLM

HKEY_LOCAL_MACHINE\SOFTWARE\MusicMatch\
Musicmatch Update\Subscriptions\DLM\
UpdateStatus

HKEY_LOCAL_MACHINE\SOFTWARE\MusicMatch\
Musicmatch Update\Subscriptions\DLM\
ChannelDir

HKEY_LOCAL_MACHINE\software\Musicmatch\
Musicmatch Update\Subscriptions\MMJB

HKEY_LOCAL_MACHINE\SOFTWARE\MusicMatch\
Musicmatch Update\Subscriptions\MMJB\
UpdateStatus

HKEY_LOCAL_MACHINE\SOFTWARE\MusicMatch\
Musicmatch Update\Subscriptions\MMJB\
ChannelDir

  SOLUTION

Minimum Scan Engine:

9.800

SSAPI PATTERN File:

2.721.00

SSAPI PATTERN Date:

18 Apr 2024

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

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

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\
    • MusicMatch
  • In HKEY_LOCAL_MACHINE\SOFTWARE\MusicMatch\
    • download
  • In HKEY_LOCAL_MACHINE\software\Musicmatch\
    • Musicmatch Update
  • In HKEY_LOCAL_MACHINE\SOFTWARE\MusicMatch\Musicmatch Update\
    • Path
  • In HKEY_LOCAL_MACHINE\SOFTWARE\MusicMatch\Musicmatch Update\
    • OEM
  • In HKEY_LOCAL_MACHINE\SOFTWARE\MusicMatch\Musicmatch Update\
    • Lang
  • In HKEY_LOCAL_MACHINE\SOFTWARE\MusicMatch\Musicmatch Update\
    • mmuid
  • In HKEY_LOCAL_MACHINE\software\Musicmatch\Musicmatch Update\
    • Subscriptions
  • In HKEY_LOCAL_MACHINE\software\Musicmatch\Musicmatch Update\Subscriptions\
    • DLM
  • In HKEY_LOCAL_MACHINE\SOFTWARE\MusicMatch\Musicmatch Update\Subscriptions\DLM\
    • UpdateStatus
  • In HKEY_LOCAL_MACHINE\SOFTWARE\MusicMatch\Musicmatch Update\Subscriptions\DLM\
    • ChannelDir
  • In HKEY_LOCAL_MACHINE\software\Musicmatch\Musicmatch Update\Subscriptions\
    • MMJB
  • In HKEY_LOCAL_MACHINE\SOFTWARE\MusicMatch\Musicmatch Update\Subscriptions\MMJB\
    • UpdateStatus
  • In HKEY_LOCAL_MACHINE\SOFTWARE\MusicMatch\Musicmatch Update\Subscriptions\MMJB\
    • ChannelDir

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\MusicMatch
    • download = %User Temp%\{Malware file name}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\MusicMatch\Musicmatch Update
    • Path = %Program Files%\Musicmatch\Musicmatch Update
  • In HKEY_LOCAL_MACHINE\SOFTWARE\MusicMatch\Musicmatch Update
    • OEM = MMD
  • In HKEY_LOCAL_MACHINE\SOFTWARE\MusicMatch\Musicmatch Update
    • Lang = DEU
  • In HKEY_LOCAL_MACHINE\SOFTWARE\MusicMatch\Musicmatch Update
    • mmuid  = {GUID}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\MusicMatch\Musicmatch Update\Subscriptions\DLM
    • UpdateStatus = 0
  • In HKEY_LOCAL_MACHINE\SOFTWARE\MusicMatch\Musicmatch Update\Subscriptions\DLM
    • ChannelDir = %Program Files%\Musicmatch\Musicmatch Update\DLM
  • In HKEY_LOCAL_MACHINE\SOFTWARE\MusicMatch\Musicmatch Update\Subscriptions\MMJB
    • UpdateStatus = 0
  • In HKEY_LOCAL_MACHINE\SOFTWARE\MusicMatch\Musicmatch Update\Subscriptions\MMJB
    • ChannelDir = %Program Files%\Musicmatch\Musicmatch Update\MMJB
  • In HKEY_LOCAL_MACHINE\SOFTWARE\MusicMatch\Musicmatch Update\Subscriptions\DLM
    • UpdateStatus = 2
  • In HKEY_LOCAL_MACHINE\SOFTWARE\MusicMatch\Musicmatch Update\Subscriptions\MMJB
    • UpdateStatus = 2

Step 5

Search and delete these files

[ Learn More ]
There may be some 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. DATA_GENERIC
  • Once located, select the file then press SHIFT+DELETE to delete it.
  • Repeat the said steps for all files listed.
    *Note: Read the following Microsoft page if these steps do not work on Windows 7 and Server 2008 (R2).

    • Step 6

    Scan your computer with your Trend Micro product to delete files detected as Adware.Win32.NaviHelper.A. 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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