Analysis by: Alyssa Christelle Ramos


Backdoor:MSIL/Bladabindi.SBR!MSR (Microsoft), MSIL:Bladabindi-JK [Trj](AVAST)




  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes


Infection Channel: Copies itself in archived files

Cybercriminals used this malware bundled with legitimate installation copies of the VPN software known as Windscribe. Note that these copies are hosted from fraudulent sources.

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

It executes commands from a remote malicious user, effectively compromising the affected system.

It gathers certain information on the affected computer. It logs a user's keystrokes to steal information.


File Size: 32,768 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 01 Sep 2020
Payload: Connects to URLs/IPs, Steals information, Logs keystrokes, Downloads files, Executes files

Arrival Details

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


This Backdoor adds the following mutexes to ensure that only one of its copies runs at any one time:

  • 61d7bbb639f843c98f77625f64a72439

Other System Modifications

This Backdoor adds the following registry entries:

di = !

di = !

[kl] = {Stolen Information}

Backdoor Routine

This Backdoor executes the following commands from a remote malicious user:

  • Download a file
  • Execute a file
  • Update files
  • Take a screenshot of user's screen
  • Install and execute plugin
  • Uninstall - remove files and registries associated with the malware
  • Get value/s of HKEY_CURRENT_USER\Software\61d7bbb639f843c98f77625f64a72439
  • Set value/s of HKEY_CURRENT_USER\Software\61d7bbb639f843c98f77625f64a72439
  • Delete value/s of HKEY_CURRENT_USER\Software\61d7bbb639f843c98f77625f64a72439
  • Terminate malware process

It connects to the following URL(s) to send and receive commands from a remote malicious user:

  • gamezer1hack.{BLOCKED}

Information Theft

This Backdoor gathers the following information on the affected computer:

  • AV Products
  • System Drive Volume Serial Number
  • Capture Device Information
  • Machine Name
  • User Name
  • Date of Infection
  • Operating System
  • Operating System Service Pack
  • System Type (32-bit/64-bit)
  • AV Products
  • Values of HKEY_CURRENT_USER\Software\61d7bbb639f843c98f77625f64a72439
  • Active Window
  • Malware version

It logs a user's keystrokes to steal information.


Minimum Scan Engine: 9.850
VSAPI OPR PATTERN File: 16.201.00
VSAPI OPR PATTERN Date: 02 Sep 2020

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

Identify and terminate files detected as Backdoor.MSIL.BLADABINDI.THA

[ Learn More ]
  1. Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
  2. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  3. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

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_USERS\{User's ID}
    • di = !
    • di = !
  • In HKEY_CURRENT_USER\Software\61d7bbb639f843c98f77625f64a72439
    • [kl] = {Stolen Information}

Step 5

Scan your computer with your Trend Micro product to delete files detected as Backdoor.MSIL.BLADABINDI.THA. 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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