Sigma rule: Potential DLL File Download Via PowerShell Invoke-WebRequest

Rule

Title

Potential DLL File Download Via PowerShell Invoke-WebRequest

Status

test

Level

medium

Author

Florian Roth (Nextron Systems), Hieu Tran

Date

2023-03-13

Modified

2025-07-18

File

rules/windows/process_creation/proc_creation_win_powershell_download_dll.yml

Commit

ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects potential DLL files being downloaded using the PowerShell Invoke-WebRequest or Invoke-RestMethod cmdlets.

Log source

product

windows

category

process_creation

Detection

selection:
    CommandLine|contains:
        - 'Invoke-RestMethod '
        - 'Invoke-WebRequest '
        - 'IRM '
        - 'IWR '
    CommandLine|contains|all:
        - 'http'
        - 'OutFile'
        - '.dll'
condition: selection

False positives (as the rule lists them)

• Unknown

Tags

• attack.command-and-control
• attack.execution
• attack.t1059.001
• attack.t1105

MITRE ATT&CK ids this rule names

• T1059.001
• T1105

References

• https://www.zscaler.com/blogs/security-research/onenote-growing-threat-malware-distribution

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_dll.yml