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Elastic Docs ›Elastic Security Solution [7.15] ›Detections and alerts ›Prebuilt rule reference

Webshell Detection: Script Process Child of Common Web Processes

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Webshell Detection: Script Process Child of Common Web Processes

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Identifies suspicious commands executed via a web server, which may suggest a vulnerability and remote shell access.

Rule type: eql

Rule indices:

  • winlogbeat-*
  • logs-endpoint.events.*
  • logs-windows.*

Severity: high

Risk score: 73

Runs every: 5 minutes

Searches indices from: now-9m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

Tags:

  • Elastic
  • Host
  • Windows
  • Threat Detection
  • Persistence

Version: 1

Added (Elastic Stack release): 7.15.0

Rule authors: Elastic

Rule license: Elastic License v2

Potential false positives

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Security audits, maintenance and network administrative scripts may trigger this alert when run under web processes.

Investigation guide

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## Triage and analysis

Detections should be investigated to identify if the activity corresponds to legitimate activity. As this rule detects post-exploitation process activity, investigations into this should be prioritized.

Rule query

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process where event.type == "start" and process.parent.name :
("w3wp.exe", "httpd.exe", "nginx.exe", "php.exe", "php-cgi.exe",
"tomcat.exe") and process.name : ("cmd.exe", "cscript.exe",
"powershell.exe", "pwsh.exe", "wmic.exe", "wscript.exe")

Threat mapping

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Framework: MITRE ATT&CKTM

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