Sigma rule: Potentially Suspicious File Download From File Sharing Domain Via PowerShell.EXE

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-c4b2a4d73a75, updated 2026-03-29T00:00:00.000Z.

Rule

Title: Potentially Suspicious File Download From File Sharing Domain Via PowerShell.EXE
Status: test
Level: high
Author: Nasreddine Bencherchali (Nextron Systems)
Date: 2024-02-23
Modified: 2026-03-29
File: rules/windows/process_creation/proc_creation_win_powershell_download_susp_file_sharing_domains.yml
Commit: ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects potentially suspicious file downloads from file sharing domains using PowerShell.exe

Log source

product: windows
category: process_creation

Detection

selection_img:
    - Image|endswith:
          - '\powershell.exe'
          - '\pwsh.exe'
    - OriginalFileName:
          - 'PowerShell.EXE'
          - 'pwsh.dll'
selection_websites:
    CommandLine|contains:
        # Note: You might want to baseline the github domain before including it
        # - '.githubusercontent.com'       # Includes both gists and github repositories / Michael Haag (idea).
        - '0x0.st'
        - 'anonfiles.com'
        - 'bashupload.com'
        - 'cdn.discordapp.com'
        - 'chunk.io'
        - 'ddns.net'
        - 'dl.dropboxusercontent.com'
        - 'ghostbin.co'
        # - 'github.com'  See note above
        - 'glitch.me'
        - 'gofile.io'
        - 'hastebin.com'
        - 'mediafire.com'
        - 'mega.nz'
        - 'onrender.com'
        - 'pages.dev'
        - 'paste.ee'
        - 'pastebin.com'
        - 'pastebin.pl'
        - 'pastetext.net'
        - 'pixeldrain.com'
        - 'privatlab.com'
        - 'privatlab.net'
        - 'send.exploit.in'
        - 'sendspace.com'
        - 'storage.googleapis.com'
        - 'storjshare.io'
        - 'supabase.co'
        - 'temp.sh'
        - 'transfer.sh'
        - 'trycloudflare.com'
        - 'ufile.io'
        - 'w3spaces.com'
        - 'workers.dev'
        - 'x0.at'
selection_download:
    CommandLine|contains:
        - '.DownloadString('
        - '.DownloadFile('
        - 'Invoke-WebRequest '
        - 'iwr '
        - 'wget '
condition: all of selection_*

False positives (as the rule lists them)

Unknown

Related rules

References

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/process_creation/proc_creation_win_powershell_download_susp_file_sharing_domains.yml

Sources and licences

SigmaHQ
"Potentially Suspicious File Download From File Sharing Domain Via PowerShell.EXE" by Nasreddine Bencherchali (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/process_creation/proc_creation_win_powershell_download_susp_file_sharing_domains.yml.
Licensed under the Detection Rule License (DRL) 1.1: https://github.com/SigmaHQ/Detection-Rule-License
Detection Rule License (DRL) 1.1

Cite this page

Dragons Eye Ransomware Tracker, "Sigma rule: Potentially Suspicious File Download From File Sharing Domain Via PowerShell.EXE",
entity page, dataset version ref-c4b2a4d73a75, updated 2026-03-29T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/b6e04788-29e1-4557-bb14-77f761848ab8 (accessed 2026-11-03).
Underlying source: SigmaHQ rule b6e04788-29e1-4557-bb14-77f761848ab8, commit ccbb0369507f796db0b0ae6854c8a2be471b9d84.

Pages change. The dataset version identifies the data, but no archive of old versions is kept, so this citation cannot be replayed later.