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69 lines
2.6 KiB
YAML
69 lines
2.6 KiB
YAML
name: AWS IAM Delete Policy
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id: ec3a9362-92fe-11eb-99d0-acde48001122
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version: 1
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date: '2021-04-01'
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author: Michael Haag, Splunk
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type: batch
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datamodel: []
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description: The following detection identifes when a policy is deleted on AWS. This
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does not identify whether successful or failed, but the error messages tell a story
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of suspicious attempts. There is a specific process to follow when deleting a policy.
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First, detach the policy from all users, groups, and roles that the policy is attached
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to, using DetachUserPolicy , DetachGroupPolicy , or DetachRolePolicy.
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search: '`cloudtrail` eventName=DeletePolicy (userAgent!=*.amazonaws.com) | stats
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count min(_time) as firstTime max(_time) as lastTime values(requestParameters.policyArn)
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as policyArn by src eventName eventSource aws_account_id errorCode errorMessage
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userAgent eventID awsRegion userIdentity.principalId userIdentity.arn | `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)` | `aws_iam_delete_policy_filter`'
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how_to_implement: The Splunk AWS Add-on and Splunk App for AWS is required to utilize
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this data. The search requires AWS Cloudtrail logs.
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known_false_positives: This detection will require tuning to provide high fidelity
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detection capabilties. Tune based on src addresses (corporate offices, VPN terminations)
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or by groups of users. Not every user with AWS access should have permission to
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delete policies (least privilege). In addition, this may be saved seperately and
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tuned for failed or success attempts only.
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references:
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- https://docs.aws.amazon.com/IAM/latest/APIReference/API_DeletePolicy.html
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- https://docs.aws.amazon.com/cli/latest/reference/iam/delete-policy.html
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tags:
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analytic_story:
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- AWS IAM Privilege Escalation
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automated_detection_testing: passed
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confidence: 50
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context:
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- Source:Cloud Data
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- Scope:External
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- Stage:Execution
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- Other:Policy Violation
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dataset:
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- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1098/aws_iam_delete_policy/aws_iam_delete_policy.json
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impact: 20
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kill_chain_phases:
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- Actions on Objectives
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message: User $user_arn$ has deleted AWS Policies from IP address $src$ by executing
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the following command $eventName$
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mitre_attack_id:
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- T1098
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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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- Splunk Security Analytics for AWS
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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.policyArn
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risk_score: 10
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security_domain: access
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