mirror of
https://github.com/splunk/security_content
synced 2026-06-08 17:32:49 +00:00
Eric
72 lines
3.2 KiB
YAML
72 lines
3.2 KiB
YAML
name: AWS SetDefaultPolicyVersion
|
|
id: 2a9b80d3-6340-4345-11ad-212bf3d0dac4
|
|
version: 7
|
|
date: '2025-05-02'
|
|
author: Bhavin Patel, Splunk
|
|
status: production
|
|
type: TTP
|
|
description: The following analytic detects when a user sets a default policy version
|
|
in AWS. It leverages AWS CloudTrail logs to identify the `SetDefaultPolicyVersion`
|
|
event from the IAM service. This activity is significant because attackers may exploit
|
|
this technique for privilege escalation, especially if previous policy versions
|
|
grant more extensive permissions than the current one. If confirmed malicious, this
|
|
could allow an attacker to gain elevated access to AWS resources, potentially leading
|
|
to unauthorized actions and data breaches.
|
|
data_source:
|
|
- AWS CloudTrail SetDefaultPolicyVersion
|
|
search: '`cloudtrail` eventName=SetDefaultPolicyVersion eventSource = iam.amazonaws.com
|
|
| rename user_name as user
|
|
| stats count min(_time) as firstTime max(_time) as lastTime by signature dest user user_agent src vendor_account vendor_region vendor_product
|
|
| `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `aws_setdefaultpolicyversion_filter`'
|
|
how_to_implement: You must install splunk AWS add on and Splunk App for AWS. This
|
|
search works with AWS CloudTrail logs.
|
|
known_false_positives: While this search has no known false positives, it is possible
|
|
that an AWS admin has legitimately set a default policy to allow a user to access
|
|
all resources. That said, AWS strongly advises against granting full control to
|
|
all AWS resources
|
|
references:
|
|
- https://bishopfox.com/blog/privilege-escalation-in-aws
|
|
- https://rhinosecuritylabs.com/aws/aws-privilege-escalation-methods-mitigation-part-2/
|
|
drilldown_searches:
|
|
- name: View the detection results for - "$user$"
|
|
search: '%original_detection_search% | search user = "$user$"'
|
|
earliest_offset: $info_min_time$
|
|
latest_offset: $info_max_time$
|
|
- name: View risk events for the last 7 days for - "$user$"
|
|
search: '| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$user$")
|
|
starthoursago=168 | stats count min(_time) as firstTime max(_time) as lastTime
|
|
values(search_name) as "Search Name" values(risk_message) as "Risk Message" values(analyticstories)
|
|
as "Analytic Stories" values(annotations._all) as "Annotations" values(annotations.mitre_attack.mitre_tactic)
|
|
as "ATT&CK Tactics" by normalized_risk_object | `security_content_ctime(firstTime)`
|
|
| `security_content_ctime(lastTime)`'
|
|
earliest_offset: $info_min_time$
|
|
latest_offset: $info_max_time$
|
|
rba:
|
|
message: From IP address $src$, user $user$ has trigged an action $signature$
|
|
for updating the the default policy version
|
|
risk_objects:
|
|
- field: user
|
|
type: user
|
|
score: 30
|
|
threat_objects:
|
|
- field: src
|
|
type: ip_address
|
|
tags:
|
|
analytic_story:
|
|
- AWS IAM Privilege Escalation
|
|
asset_type: AWS Account
|
|
mitre_attack_id:
|
|
- T1078.004
|
|
product:
|
|
- Splunk Enterprise
|
|
- Splunk Enterprise Security
|
|
- Splunk Cloud
|
|
security_domain: threat
|
|
tests:
|
|
- name: True Positive Test
|
|
attack_data:
|
|
- data:
|
|
https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1078/aws_setdefaultpolicyversion/aws_cloudtrail_events.json
|
|
sourcetype: aws:cloudtrail
|
|
source: aws_cloudtrail
|