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Add filter_common exclusions for ParentCommandLine 'openclaw-gateway' and CommandLine 'ip neigh show', update the rule condition to exclude these benign matches, and bump the modified date to 2025-02-13. This reduces false positives for common legitimate network discovery activity.
nasbench
reviewed
Feb 16, 2026
| filter_common: | ||
| - ParentCommandLine: 'openclaw-gateway' | ||
| - CommandLine: 'ip neigh show' | ||
| condition: 1 of selection_* and not filter_common |
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The rule is of level informational which we usually do not add filter to, since its meant for enrichment mainly.
The rule you want to update is Detects suspicious sub processes of web server processes
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Add filter_common exclusions for ParentCommandLine 'openclaw-gateway' and CommandLine 'ip neigh show', update the rule condition to exclude these benign matches, and bump the modified date to 2025-02-13. This reduces false positives for common legitimate network discovery activity.
Summary of the Pull Request
Fixes false positives in OpenClaw deployments. OpenClaw and similar agents run the "ip neigh show" command with a parent that is "node". It's not web shell activity. The level "high" of this rule caused me to add a filter for this false positive.
Changelog
fix: fix false positives in OpenClaw environments
Example Log Event
{ "CommandLine": "ip neigh show", "CurrentDirectory": "/home/neo/clawd", "Image": "/usr/bin/ip", "LogonId": "1000", "ParentCommandLine": "openclaw-gateway", "ParentImage": "/usr/bin/node", "ParentProcessId": "439637", "ProcessId": "730567", "User": "neo", "level": "error", "message": "Sigma match", "rule_author": "Florian Roth (Nextron Systems), Nasreddine Bencherchali (Nextron Systems)", "rule_date": "2021-10-15", "rule_description": "Detects suspicious sub processes of web server processes", "rule_falsepositives": [ "Web applications that invoke Linux command line tools" ], "rule_id": "818f7b24-0fba-4c49-a073-8b755573b9c7", "rule_level": "high", "rule_modified": "2022-12-28", "rule_path": "/opt/aurora-linux/sigma-rules/linux/process_creation/proc_creation_lnx_webshell_detection.yml", "rule_references": [ "https://www.acunetix.com/blog/articles/web-shells-101-using-php-introduction-web-shells-part-2/", "https://media.defense.gov/2020/Jun/09/2002313081/-1/-1/0/CSI-DETECT-AND-PREVENT-WEB-SHELL-MALWARE-20200422.PDF" ], "rule_status": "test", "rule_tags": [ "attack.persistence", "attack.t1505.003" ], "rule_title": "Linux Webshell Indicators", "sigma_match_details": { "Image": [ "/ip" ], "ParentImage": [ "/node" ] }, "sigma_match_fields": [ "Image", "ParentImage" ], "sigma_match_strings": [ "'/ip' in Image", "'/node' in ParentImage" ], "sigma_rule": "818f7b24-0fba-4c49-a073-8b755573b9c7", "sigma_tags": [ "attack.persistence", "attack.t1505.003" ], "sigma_title": "Linux Webshell Indicators", "timestamp": "2026-02-13T15:09:35.20610728+01:00" }Fixed Issues
Fixes false positives in OpenClaw deployments.
SigmaHQ Rule Creation Conventions