AWS IAM Backdoor Users Keys

calendar Oct 12, 2023 · attack.persistence attack.t1098  ·
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Detects AWS API key creation for a user by another user. Backdoored users can be used to obtain persistence in the AWS environment. Also with this alert, you can detect a flow of AWS keys in your org.

Sigma rule (View on GitHub)

 1title: AWS IAM Backdoor Users Keys
 2id: 0a5177f4-6ca9-44c2-aacf-d3f3d8b6e4d2
 3status: test
 4description: |
 5  Detects AWS API key creation for a user by another user.
 6  Backdoored users can be used to obtain persistence in the AWS environment.
 7  Also with this alert, you can detect a flow of AWS keys in your org.  
 8references:
 9    - https://github.com/RhinoSecurityLabs/pacu/blob/866376cd711666c775bbfcde0524c817f2c5b181/pacu/modules/iam__backdoor_users_keys/main.py
10author: faloker
11date: 2020/02/12
12modified: 2022/10/09
13tags:
14    - attack.persistence
15    - attack.t1098
16logsource:
17    product: aws
18    service: cloudtrail
19detection:
20    selection_source:
21        eventSource: iam.amazonaws.com
22        eventName: CreateAccessKey
23    filter:
24        userIdentity.arn|contains: responseElements.accessKey.userName
25    condition: selection_source and not filter
26fields:
27    - userIdentity.arn
28    - responseElements.accessKey.userName
29    - errorCode
30    - errorMessage
31falsepositives:
32    - Adding user keys to their own accounts (the filter cannot cover all possible variants of user naming)
33    - AWS API keys legitimate exchange workflows
34level: medium

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