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What is Gramblr?

The Malwarebytes research team has determined that Gramblr is an adware bundler. These bundlers typically install potentially unwanted programs (PUPs) or adware on top of the desired software.

How do I know if my computer is affected by Gramblr?

You may see these warnings during install:

warning1.png

warning2.png

warning3.png

and this entry in your list of installed Programs and Features:

warning4.png

How did Gramblr get on my computer?

Bundlers use different methods for distributing themselves. This particular one was offered as an Instagram uploader.

How do I remove Gramblr?

Our program Malwarebytes can detect and remove this bundler. For a more complete removal of Gramblr use the uninstall from Programs and Features, then follow the instructions below to remove any (potentially) unwanted bundleware.

  • Please download Malwarebytes to your desktop.
  • Double-click mb3-setup-consumer-{version}.exe and follow the prompts to install the program.
  • Then click Finish.
  • Once the program has fully updated, select Scan Now on the Dashboard. Or select the Threat Scan from the Scan menu.
  • If another update of the definitions is available, it will be implemented before the rest of the scanning procedure.
  • When the scan is complete, make sure that all Threats are selected, and click Remove Selected.
  • Restart your computer when prompted to do so.

Is there anything else I need to do to get rid of Gramblr?

  • No, Malwarebytes disables Gramblr completely.

How would the full version of Malwarebytes help protect me?

We hope our application and this guide have helped you eradicate this bundler.

As you can see below the full version of Malwarebytes would have protected you against the Gramblr bundler. It would have blocked the installer before it became too late.

 

protection1.png


Technical details for experts

Possible signs in FRST logs:
 

(Gramblr -> ) [File not signed] C:\Program Files\Gramblr\gramblr.exe
R2 gramblrclient; C:\Program Files\Gramblr\gramblr.exe [10014800 2019-10-22] (Gramblr -> ) [File not signed]
C:\ProgramData\Gramblr
C:\Program Files\Gramblr
C:\ProgramData\Microsoft\Windows\Start Menu\Programs\Gramblr.lnk
(Offerbox ) C:\Users\{username}\Desktop\Gramblr_Setup.exe

Gramblr (HKLM-x32\...\Gramblr) (Version: 2.9.131 - Gramblr Team)

Significant changes made by the installer:

File system details [View: All details] (Selection)
---------------------------------------------------
    Adds the folder C:\Program Files\Gramblr
       Adds the file gramblr.exe"="10/22/2019 10:53 AM, 10014800 bytes, A
    Adds the folder C:\ProgramData\Gramblr
       Adds the file chrome.vbs"="10/22/2019 10:53 AM, 295 bytes, A
       Adds the file convert.exe"="10/22/2019 10:53 AM, 12395520 bytes, A
       Adds the file gramblr.db"="10/22/2019 10:53 AM, 14336 bytes, A
       Adds the file restart.vbs"="10/22/2019 10:53 AM, 285 bytes, A
       Adds the file runtime.log"="10/22/2019 10:53 AM, 0 bytes, A
       Adds the file sessions.db"="10/22/2019 10:53 AM, 7168 bytes, A
       Adds the file updater.ini"="10/22/2019 10:53 AM, 0 bytes, A
       Adds the file vcomp100.dll"="10/22/2019 10:53 AM, 51024 bytes, A
    Adds the folder C:\ProgramData\Gramblr\backup
       Adds the file gramblr.exe"="4/24/2018 10:34 AM, 8370768 bytes, A
    In the existing folder C:\ProgramData\Microsoft\Windows\Start Menu\Programs
       Adds the file Gramblr.lnk"="10/22/2019 10:52 AM, 798 bytes, A
    Adds the folder C:\Users\{username}\AppData\Local\VirtualStore\ProgramData\Gramblr
       Adds the file gramblr.db"="10/22/2019 10:53 AM, 14336 bytes, A
    Adds the folder C:\Users\{username}\Desktop\Gramblr
       Adds the file Gramblr.exe"="4/24/2018 10:34 AM, 8370768 bytes, A

Registry details [View: All details] (Selection)
------------------------------------------------
    [HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\Gramblr]
       "DisplayIcon"="REG_SZ", "C:\Program Files\Gramblr\gramblr.exe"
       "DisplayName"="REG_SZ", "Gramblr"
       "DisplayVersion"="REG_SZ", "2.9.131"
       "EstimatedSize"="REG_DWORD", 6800
       "InstallLocation"="REG_SZ", "C:\Program Files\Gramblr"
       "Language"="REG_DWORD", 0
       "NoModify"="REG_DWORD", 1
       "NoRepair"="REG_DWORD", 1
       "Publisher"="REG_SZ", "Gramblr Team"
       "UninstallString"="REG_SZ", ""C:\Program Files\Gramblr\gramblr.exe" --uninstall"
       "UrlInfoAbout"="REG_SZ", "http://gramblr.com"
       "VersionMajor"="REG_DWORD", 2
       "VersionMinor"="REG_DWORD", 0
    [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\gramblrclient]
       "Description"="REG_SZ", "Provides event-based networking capabilities to the core engine and gives client applications to ability to communicate with Gramblr"
       "DisplayName"="REG_SZ", "Windows Connectivity Manager for Gramblr"
       "ErrorControl"="REG_DWORD", 1
       "FailureActions"="REG_BINARY, ..............
       "FailureActionsOnNonCrashFailures"="REG_DWORD", 1
       "ImagePath"="REG_EXPAND_SZ, "C:\Program Files\Gramblr\gramblr.exe"
       "ObjectName"="REG_SZ", "LocalSystem"
       "Start"="REG_DWORD", 2
       "Type"="REG_DWORD", 16
       "WOW64"="REG_DWORD", 1

Malwarebytes log:

Malwarebytes
www.malwarebytes.com

-Log Details-
Scan Date: 10/22/19
Scan Time: 11:02 AM
Log File: ad916cf6-f4aa-11e9-98be-00ffdcc6fdfc.json

-Software Information-
Version: 3.8.3.2965
Components Version: 1.0.613
Update Package Version: 1.0.13005
License: Premium

-System Information-
OS: Windows 7 Service Pack 1
CPU: x64
File System: NTFS
User: {computername}\{username}

-Scan Summary-
Scan Type: Threat Scan
Scan Initiated By: Manual
Result: Completed
Objects Scanned: 234315
Threats Detected: 2
Threats Quarantined: 2
Time Elapsed: 12 min, 38 sec

-Scan Options-
Memory: Enabled
Startup: Enabled
Filesystem: Enabled
Archives: Enabled
Rootkits: Enabled
Heuristics: Enabled
PUP: Detect
PUM: Detect

-Scan Details-
Process: 0
(No malicious items detected)

Module: 0
(No malicious items detected)

Registry Key: 0
(No malicious items detected)

Registry Value: 0
(No malicious items detected)

Registry Data: 0
(No malicious items detected)

Data Stream: 0
(No malicious items detected)

Folder: 0
(No malicious items detected)

File: 1
PUP.Optional.Appset, C:\USERS\{username}\DESKTOP\GRAMBLR_SETUP.EXE, Quarantined, [509], [591202],1.0.13005

Physical Sector: 0
(No malicious items detected)

WMI: 0
(No malicious items detected)


(end)

As mentioned before the full version of Malwarebytes could have protected your computer against this threat.
We use different ways of protecting your computer(s):

  • Dynamically Blocks Malware Sites & Servers
  • Malware Execution Prevention

Save yourself the hassle and get protected.

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