Template -- Exploit Public-Facing Application (webshell spawn)

SIGMA detection rule by WinstonRedGuard -- sigma plugin canonical templates · MIT

Canonical sigma detection template for MITRE ATT&CK T1190 (Exploit Public-Facing Application (webshell spawn)). Synthetic exemplar from the WinstonRedGuard threat-intel corpus -- no actor binding; review and bind to your environment before deployment.

title: Template -- Exploit Public-Facing Application (webshell spawn)
id: 9cb873bb-dc6c-5c79-9fdc-0bd6e2cd32be
status: experimental
description: Canonical sigma detection template for MITRE ATT&CK T1190 (Exploit Public-Facing Application (webshell spawn)).
  Synthetic exemplar from the WinstonRedGuard threat-intel corpus -- no actor binding; review and bind to your environment
  before deployment.
references:
- https://attack.mitre.org/techniques/T1190/
author: WinstonRedGuard -- sigma plugin canonical templates
date: '2026-05-21'
logsource:
  category: webserver
  product: windows
detection:
  selection_webshell:
    ParentImage|endswith:
    - \w3wp.exe
    - \httpd.exe
    - \nginx.exe
    Image|endswith:
    - \cmd.exe
    - \powershell.exe
    - \bash
    - \sh
  condition: selection_webshell
falsepositives:
- Web applications that legitimately shell out -- report generation, image conversion, PDF rendering
- Deployment hooks that run under the web server account during a release
level: medium
tags:
- attack.t1190
- wrg.template
- wrg.tactic.initial_access

[[ currentRule.title && currentRule.title.length > 60 ? currentRule.title.slice(0, 60) + '…' : currentRule.title ]]

d8581b7b-ad69-4ab5-acb0-cd27ee1c3d2e

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Executable code, not a declarative rule

This submission is arbitrary [[ currentRule.format ? currentRule.format.toUpperCase() : '' ]] code, not a declarative detection rule — review it as you would any script before running it, and note that it cannot be safely aggregated or auto-executed alongside YARA/Sigma/Suricata/CRS rules.

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