Sigma rule: Suspicious PowerShell Download - PoshModule

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-11cff846baab, updated 2023-01-20T00:00:00.000Z.

Rule

Title
Suspicious PowerShell Download - PoshModule
Status
test
Level
medium
Author
Florian Roth (Nextron Systems)
Date
2017-03-05
Modified
2023-01-20
File
rules/windows/powershell/powershell_module/posh_pm_susp_download.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects suspicious PowerShell download command

Log source

product
windows
category
ps_module
definition
0ad03ef1-f21b-4a79-8ce8-e6900c54b65b

Detection

selection_webclient_:
    ContextInfo|contains: 'System.Net.WebClient'
selection_function:
    ContextInfo|contains:
        - '.DownloadFile('
        - '.DownloadString('
condition: all of selection_*

False positives (as the rule lists them)

  • PowerShell scripts that download content from the Internet

Tags

  • attack.execution
  • attack.t1059.001

MITRE ATT&CK ids this rule names

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/powershell/powershell_module/posh_pm_susp_download.yml

Sources and licences

  • SigmaHQ

    "Suspicious PowerShell Download - PoshModule" by Florian Roth (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/powershell/powershell_module/posh_pm_susp_download.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: Suspicious PowerShell Download - PoshModule",
entity page, dataset version ref-11cff846baab, updated 2023-01-20T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/de41232e-12e8-49fa-86bc-c05c7e722df9 (accessed 2026-11-03).
Underlying source: SigmaHQ rule de41232e-12e8-49fa-86bc-c05c7e722df9, 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.