mirror of
https://github.com/splunk/security_content
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Bhavin Patel
72 lines
2.7 KiB
YAML
72 lines
2.7 KiB
YAML
name: AWS SetDefaultPolicyVersion
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id: 2a9b80d3-6340-4345-11ad-212bf3d0dac4
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version: 2
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date: '2024-05-16'
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author: Bhavin Patel, Splunk
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status: production
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type: TTP
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description: The following analytic detects when a user sets a default policy version
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in AWS. It leverages AWS CloudTrail logs to identify the `SetDefaultPolicyVersion`
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event from the IAM service. This activity is significant because attackers may exploit
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this technique for privilege escalation, especially if previous policy versions
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grant more extensive permissions than the current one. If confirmed malicious, this
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could allow an attacker to gain elevated access to AWS resources, potentially leading
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to unauthorized actions and data breaches.
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data_source:
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- AWS CloudTrail SetDefaultPolicyVersion
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search: '`cloudtrail` eventName=SetDefaultPolicyVersion eventSource = iam.amazonaws.com
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| stats count min(_time) as firstTime max(_time) as lastTime values(requestParameters.policyArn)
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as policy_arn by src requestParameters.versionId eventName eventSource aws_account_id
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errorCode userAgent eventID awsRegion userIdentity.principalId user_arn | `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)` | `aws_setdefaultpolicyversion_filter`'
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how_to_implement: You must install splunk AWS add on and Splunk App for AWS. This
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search works with AWS CloudTrail logs.
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known_false_positives: While this search has no known false positives, it is possible
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that an AWS admin has legitimately set a default policy to allow a user to access
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all resources. That said, AWS strongly advises against granting full control to
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all AWS resources
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references:
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- https://bishopfox.com/blog/privilege-escalation-in-aws
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- https://rhinosecuritylabs.com/aws/aws-privilege-escalation-methods-mitigation-part-2/
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tags:
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analytic_story:
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- AWS IAM Privilege Escalation
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asset_type: AWS Account
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confidence: 60
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impact: 50
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message: From IP address $src$, user $user_arn$ has trigged an event $eventName$
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for updating the the default policy version
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mitre_attack_id:
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- T1078.004
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- T1078
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observable:
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- name: src
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type: IP Address
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role:
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- Attacker
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- name: user_arn
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type: User
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role:
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- Victim
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product:
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- Splunk Enterprise
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- Splunk Enterprise Security
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- Splunk Cloud
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required_fields:
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- _time
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- eventName
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- userAgent
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- errorCode
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- requestParameters.userName
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- eventSource
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risk_score: 30
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security_domain: threat
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tests:
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- name: True Positive Test
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attack_data:
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- data:
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https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1078/aws_setdefaultpolicyversion/aws_cloudtrail_events.json
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sourcetype: aws:cloudtrail
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source: aws_cloudtrail
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update_timestamp: true
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