Add A Policy To A Group (aws)

Platform	Author	Last Update
aws	Nick Jones	2024-12-02

An adversary may attempt to add a policy to a group, in order to alter the permissions assigned to a user they have compromised.

MITRE IDs

• T1098

Required Permissions

• iam:AttachGroupPolicy

Required Parameters

Name	Type	Description	Example Value
group	str	Group to add policy to	NONE
policyarn	str	Policy to add to group	arn:aws:iam::aws:policy/ReadOnlyAccess

Attacker Action

aws iam attach-group-policy --group-name  --policy-arn

Detection Case

ELK query

When logs are ingested into ELK, the following Lucene query can be used to identify relevant events.

eventName:AttachGroupPolicy AND eventSource:iam.amazonaws.com

Sigma Definition

---
title: Add a policy to a group
id: 299b8380-8447-4f24-8520-c7a3c0008ef8
status: experimental
author: Nick Jones
date: 2024-12-02
description: An adversary may attempt to add a policy to a group, in order to alter the permissions assigned to a user they have compromised.
logsource:
  service: cloudtrail
detection:
  selection_source:
    - eventSource: "iam.amazonaws.com"
  events:
    - eventName: "AttachGroupPolicy"
  condition: selection_source and events
level: low
tags:
  - attack.T1098


falsepositives:
  - Developers making legitimate changes to the environment. Verify whether the user identity, user agent, and/or hostname should be making changes in your environment.