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.

0 comments
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

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

Was this answer helpful?

10+ people found this answer helpful.
0 comments

186 additional answers

Sort by: Most helpful
Most helpful Newest Oldest
  1. Anonymous
    2025-06-15T10:29:48+00:00

    Fixlog is here

    StartFragment Fixlog.txtEndFragment

    Which freeware or opensource software would you recommend for use as a firewall , anti-virus, anti-malware?

    Was this answer helpful?

    0 comments
  2. Anonymous
    2025-06-15T10:10:07+00:00

    Here StartFragment FIRST and Addition log files.zipEndFragment

    Was this answer helpful?

    0 comments
  3. Anonymous
    2025-06-15T09:57:03+00:00

    Microsoft Windows [Version 10.0.26100.4351]

    (c) Microsoft Corporation. All rights reserved.

    C:\Windows\System32>netsh.exe winhttp reset proxy

    Current WinHTTP proxy settings: 

    Direct access (no proxy server).

    C:\Windows\System32>

    C:\Windows\System32>netsh.exe winhttp reset proxy

    Current WinHTTP proxy settings: 

    Direct access (no proxy server).

    C:\Windows\System32>bitsadmin /util /setieproxy localsystem NO_PROXY RESET

    BITSADMIN version 3.0

    BITS administration utility.

    (C) Copyright Microsoft Corp.

    Internet proxy settings for account localsystem set to NO_PROXY.

    (connection = default)

    C:\Windows\System32>rd /s /q C:\Windows\system32\DomainAuthHost

    C:\Windows\system32\DomainAuthHost\0.amda399f118.node - Access is denied.

    C:\Windows\system32\DomainAuthHost\0.ey7cz27ekj.node - Access is denied.

    C:\Windows\system32\DomainAuthHost\0.h23of2pnh4v.node - Access is denied.

    C:\Windows\system32\DomainAuthHost\0.wa0ptnybkms.node - Access is denied.

    C:\Windows\system32\DomainAuthHost\0.y68lrgd7lb8.node - Access is denied.

    C:\Windows\system32\DomainAuthHost\db\000016.ldb - The process cannot access the file because it is being used by another process.

    C:\Windows\system32\DomainAuthHost\db\000018.ldb - The process cannot access the file because it is being used by another process.

    C:\Windows\system32\DomainAuthHost\db\000019.log - The process cannot access the file because it is being used by another process.

    C:\Windows\system32\DomainAuthHost\db\LOCK - The process cannot access the file because it is being used by another process.

    C:\Windows\system32\DomainAuthHost\db\LOG - The process cannot access the file because it is being used by another process.

    C:\Windows\system32\DomainAuthHost\db\MANIFEST-000017 - The process cannot access the file because it is being used by another process.

    C:\Windows\system32\DomainAuthHost\node.exe - Access is denied.

    The process cannot access the file because it is being used by another process.

    C:\Windows\System32>

    Was this answer helpful?

    0 comments
  4. Anonymous
    2025-06-15T09:03:12+00:00

    Hi,

    I have the same problem and I am providing the requested files. Thanks in advance

    https://filego.io/hevhzptj

    @NerminXS:

    From adminCommand Prompt run these commands:

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

    Post the output here.

    Rename the Farbar Scanner executable to FRST64English.exe and post fresh logs.

    Was this answer helpful?

    0 comments