Sigma rule: Suspicious Invoke-WebRequest Execution With DirectIP

Rule

Title

Suspicious Invoke-WebRequest Execution With DirectIP

Status

test

Level

medium

Author

Nasreddine Bencherchali (Nextron Systems)

Date

2023-04-21

File

rules/windows/process_creation/proc_creation_win_powershell_invoke_webrequest_direct_ip.yml

Commit

ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects calls to PowerShell with Invoke-WebRequest cmdlet using direct IP access

Log source

product

windows

category

process_creation

Detection

selection_img:
    - Image|endswith:
          - '\powershell_ise.exe'
          - '\powershell.exe'
          - '\pwsh.exe'
    - OriginalFileName:
          - 'powershell_ise.EXE'
          - 'PowerShell.EXE'
          - 'pwsh.dll'
selection_commands:
    CommandLine|contains:
        # These are all aliases of Invoke-WebRequest
        - 'curl '
        - 'Invoke-RestMethod'
        - 'Invoke-WebRequest'
        - ' irm ' # Space before and after to avoid false positives with 'irm' as a substring
        - 'iwr '
        - 'wget '
selection_ip:
    # In case of FP with local IPs add additional filters
    CommandLine|contains:
        - '://1'
        - '://2'
        - '://3'
        - '://4'
        - '://5'
        - '://6'
        - '://7'
        - '://8'
        - '://9'
condition: all of selection_*

False positives (as the rule lists them)

• Unknown

Tags

• attack.command-and-control
• attack.t1105

MITRE ATT&CK ids this rule names

• T1105

References

• https://www.huntress.com/blog/critical-vulnerabilities-in-papercut-print-management-software

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_invoke_webrequest_direct_ip.yml