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Detection rules › Sigma

Nginx Core Dump

Status
test
Severity
high
Log source
service nginx
Author
Florian Roth (Nextron Systems)
Source
github.com/SigmaHQ/sigma

Detects a core dump of a crashing Nginx worker process, which could be a signal of a serious problem or exploitation attempts.

Known false positives

  • Serious issues with a configuration or plugin

MITRE ATT&CK coverage

TacticTechniques
Impact

Rule body

title: Nginx Core Dump
id: 59ec40bb-322e-40ab-808d-84fa690d7e56
status: test
description: Detects a core dump of a crashing Nginx worker process, which could be a signal of a serious problem or exploitation attempts.
references:
    - https://docs.nginx.com/nginx/admin-guide/monitoring/debugging/#enabling-core-dumps
    - https://www.x41-dsec.de/lab/advisories/x41-2021-002-nginx-resolver-copy/
author: Florian Roth (Nextron Systems)
date: 2021-05-31
modified: 2023-05-08
tags:
    - attack.impact
    - attack.t1499.004
logsource:
    service: nginx
detection:
    keywords:
        - 'exited on signal 6 (core dumped)'
    condition: keywords
falsepositives:
    - Serious issues with a configuration or plugin
level: high

Stages and Predicates

Stage 0: condition

keywords

Stage 1: keywords

keywords:
    - 'exited on signal 6 (core dumped)'