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Convert indexed Sigma rules into analyst-ready detections.
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Indexed Rules
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17
Live from sigconverter.io
CLI Versions
10
Newest: 2.0.2
Translation Workspace
Shape the rule before it leaves Phoenix
Tune Translation
Active Rule
AWS EC2 Startup Shell Script Change
Target Profile
Splunk
Splunk SPL & tstats data model queries
Format Mode
Default
Plain SPL queries
Conversion Output
AWS EC2 Startup Shell Script Change
Using Splunk · Default · sigma-cli 2.0.2
Translation controls
Adjust the rule on the left, then regenerate when you want a fresh backend-native query.
BackendSplunkFormatDefaultVersion2.0.2
title: AWS EC2 Startup Shell Script Change
id: 1ab3c5ed-5baf-417b-bb6b-78ca33f6c3df
status: test
description: Detects changes to the EC2 instance startup script. The shell script will be executed as root/SYSTEM every time the specific instances are booted up.
references:
- https://github.com/RhinoSecurityLabs/pacu/blob/866376cd711666c775bbfcde0524c817f2c5b181/pacu/modules/ec2__startup_shell_script/main.py#L9
author: faloker
date: 2020-02-12
modified: 2022-06-07
tags:
- attack.execution
- attack.t1059.001
- attack.t1059.003
- attack.t1059.004
logsource:
product: aws
service: cloudtrail
detection:
selection_source:
eventSource: ec2.amazonaws.com
requestParameters.attribute: 'userData'
eventName: ModifyInstanceAttribute
condition: selection_source
falsepositives:
- Valid changes to the startup script
level: high
CLI command
Copy the exact command to reproduce this translation locally.
sigma convert --without-pipeline -t splunk -f default rules/cloud/aws/cloudtrail/aws_ec2_startup_script_change.yml