rules/cloud/aws/aws_ec2_startup_script_change.yml

title: AWS EC2 Startup Shell Script Change
id: 1ab3c5ed-5baf-417b-bb6b-78ca33f6c3df
status: experimental
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.
author: faloker
date: 2020/02/12
modified: 2021/08/09
references:
    - https://github.com/RhinoSecurityLabs/pacu/blob/master/modules/ec2__startup_shell_script/main.py#L9
logsource:
    product: aws
    service: cloudtrail
detection:
    selection_source:
        eventSource: ec2.amazonaws.com
        requestParameters.userData: '*'
        eventName: ModifyInstanceAttribute
    condition: selection_source
falsepositives:
    - Valid changes to the startup script
level: high
tags:
    - attack.execution
    - attack.t1059.001
    - attack.t1059.003
    - attack.t1059.004
Update rules titles 2020-02-12 23:09:16 +02:00			`title: AWS EC2 Startup Shell Script Change`
Add the rule to detect changes to startup scripts 2020-02-12 22:23:18 +02:00			`id: 1ab3c5ed-5baf-417b-bb6b-78ca33f6c3df`
			`status: experimental`
fixed various spelling errors all over rules and source code 2021-02-24 14:43:13 +00:00			`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.`
Add the rule to detect changes to startup scripts 2020-02-12 22:23:18 +02:00			`author: faloker`
			`date: 2020/02/12`
$frack113$ split PR 1802 fix rules 2021-08-09 15:41:40 +02:00			`modified: 2021/08/09`
Add the rule to detect changes to startup scripts 2020-02-12 22:23:18 +02:00			`references:`
Correct the indentation 2020-02-12 22:48:46 +02:00			`- https://github.com/RhinoSecurityLabs/pacu/blob/master/modules/ec2__startup_shell_script/main.py#L9`
Add the rule to detect changes to startup scripts 2020-02-12 22:23:18 +02:00			`logsource:`
$frack113$ Add product aws 2021-11-14 09:56:59 +01:00			`product: aws`
Correct the indentation 2020-02-12 22:48:46 +02:00			`service: cloudtrail`
Add the rule to detect changes to startup scripts 2020-02-12 22:23:18 +02:00			`detection:`
Correct the indentation 2020-02-12 22:48:46 +02:00			`selection_source:`
$frack113$ split PR 1802 fix rules 2021-08-09 15:41:40 +02:00			`eventSource: ec2.amazonaws.com`
$frack113$ Change double quote to quote 2022-01-06 14:02:35 +01:00			`requestParameters.userData: '*'`
$frack113$ split PR 1802 fix rules 2021-08-09 15:41:40 +02:00			`eventName: ModifyInstanceAttribute`
			`condition: selection_source`
Add the rule to detect changes to startup scripts 2020-02-12 22:23:18 +02:00			`falsepositives:`
			`- Valid changes to the startup script`
Fixed my git issue 2020-09-13 22:03:04 -06:00			`level: high`
Add the rule to detect changes to startup scripts 2020-02-12 22:23:18 +02:00			`tags:`
att&ck tags review: application, apt, cloud, generic, proxy 2020-09-03 14:16:47 +00:00			`- attack.execution`
			`- attack.t1059.001`
			`- attack.t1059.003`
			`- attack.t1059.004`