IMPORTANT: No additional bug fixes or documentation updates
will be released for this version. For the latest information, see the
current release documentation.
Webshell Detection: Script Process Child of Common Web Processes
editWebshell Detection: Script Process Child of Common Web Processes
editIdentifies 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: 6 (version history)
Added (Elastic Stack release): 7.15.0
Last modified (Elastic Stack release): 8.4.0
Rule authors: Elastic
Rule license: Elastic License v2
Potential false positives
editSecurity audits, maintenance, and network administrative scripts may trigger this alert when run under web processes.
Investigation guide
edit## 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
editprocess 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", "powershell_ise.exe", "wmic.exe",
"wscript.exe")
Threat mapping
editFramework: MITRE ATT&CKTM
-
Tactic:
- Name: Persistence
- ID: TA0003
- Reference URL: https://attack.mitre.org/tactics/TA0003/
-
Technique:
- Name: Server Software Component
- ID: T1505
- Reference URL: https://attack.mitre.org/techniques/T1505/
-
Tactic:
- Name: Initial Access
- ID: TA0001
- Reference URL: https://attack.mitre.org/tactics/TA0001/
-
Technique:
- Name: Exploit Public-Facing Application
- ID: T1190
- Reference URL: https://attack.mitre.org/techniques/T1190/
Rule version history
edit- Version 6 (8.4.0 release)
-
-
Updated query, changed from:
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", "powershell_ise.exe", "wmic.exe", "wscript.exe")
-
- Version 4 (8.2.0 release)
-
- Formatting only
- Version 3 (7.16.0 release)
-
-
Updated query, changed from:
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")
-