SigmaHQ/rules/cloud/aws_ec2_download_userdata.yml

title: AWS EC2 Download Userdata
id: 26ff4080-194e-47e7-9889-ef7602efed0c
status: experimental
author: faloker
date: 2020/02/11
description: Detects bulk downloading of User Data associated with AWS EC2 instances. Instance User Data may include installation scripts and hard-coded secrets for deployment.
references:
    - https://github.com/RhinoSecurityLabs/pacu/blob/master/modules/ec2__download_userdata/main.py#L24
logsource:
    service: cloudtrail
detection:
    selection_source:
        - eventSource: ec2.amazonaws.com
    selection_requesttype:
        - requestParameters.attribute: userData
    selection_eventname:
        - eventName: DescribeInstanceAttribute
    timeframe: 30m
    condition: all of them | count() > 10
level: medium
falsepositives:
    - Assets management software like device42
tags:
    - attack.t1020
Update rules titles 2020-02-12 21:09:16 +00:00			`title: AWS EC2 Download Userdata`
Add a rule for ec2 userdata exfil 2020-02-11 21:25:54 +00:00			`id: 26ff4080-194e-47e7-9889-ef7602efed0c`
			`status: experimental`
			`author: faloker`
			`date: 2020/02/11`
			`description: Detects bulk downloading of User Data associated with AWS EC2 instances. Instance User Data may include installation scripts and hard-coded secrets for deployment.`
			`references:`
Correct the indentation 2020-02-12 20:48:46 +00:00			`- https://github.com/RhinoSecurityLabs/pacu/blob/master/modules/ec2__download_userdata/main.py#L24`
Add a rule for ec2 userdata exfil 2020-02-11 21:25:54 +00:00			`logsource:`
Correct the indentation 2020-02-12 20:48:46 +00:00			`service: cloudtrail`
Add a rule for ec2 userdata exfil 2020-02-11 21:25:54 +00:00			`detection:`
Correct the indentation 2020-02-12 20:48:46 +00:00			`selection_source:`
			`- eventSource: ec2.amazonaws.com`
			`selection_requesttype:`
			`- requestParameters.attribute: userData`
			`selection_eventname:`
			`- eventName: DescribeInstanceAttribute`
			`timeframe: 30m`
			`condition: all of them \| count() > 10`
Add a rule for ec2 userdata exfil 2020-02-11 21:25:54 +00:00			`level: medium`
			`falsepositives:`
			`- Assets management software like device42`
			`tags:`
Correct the indentation 2020-02-12 20:48:46 +00:00			`- attack.t1020`