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Detection rules › Sigma

Shellshock Expression

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

Detects shellshock expressions in log files

MITRE ATT&CK coverage

TacticTechniques
PersistenceT1505.003 Server Software Component: Web Shell

Rule body yaml

title: Shellshock Expression
id: c67e0c98-4d39-46ee-8f6b-437ebf6b950e
status: test
description: Detects shellshock expressions in log files
references:
    - https://owasp.org/www-pdf-archive/Shellshock_-_Tudor_Enache.pdf
author: Florian Roth (Nextron Systems)
date: 2017-03-14
modified: 2022-10-09
tags:
    - attack.persistence
    - attack.t1505.003
logsource:
    product: linux
detection:
    keywords:
        - '(){:;};'
        - '() {:;};'
        - '() { :;};'
        - '() { :; };'
    condition: keywords
falsepositives:
    - Unknown
level: high

Stages and Predicates

Stage 0: condition

keywords

Stage 1: keywords

keywords:
    - '(){:;};'
    - '() {:;};'
    - '() { :;};'
    - '() { :; };'