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https://github.com/splunk/security_content
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Bhavin Patel
76 lines
2.8 KiB
YAML
76 lines
2.8 KiB
YAML
name: AWS Password Policy Changes
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id: aee4a575-7064-4e60-b511-246f9baf9895
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version: 2
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date: '2024-05-10'
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author: Bhavin Patel, Splunk
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status: production
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type: Hunting
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description: The following analytic detects successful API calls to view, update,
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or delete the password policy in an AWS organization. It leverages AWS CloudTrail
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logs to identify events such as "UpdateAccountPasswordPolicy," "GetAccountPasswordPolicy,"
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and "DeleteAccountPasswordPolicy." This activity is significant because it is uncommon
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for regular users to perform these actions, and such changes can indicate an adversary
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attempting to understand or weaken password defenses. If confirmed malicious, this
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could lead to compromised accounts and increased attack surface, potentially allowing
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unauthorized access and control over AWS resources.
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data_source:
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- AWS CloudTrail UpdateAccountPasswordPolicy
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- AWS CloudTrail GetAccountPasswordPolicy
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- AWS CloudTrail DeleteAccountPasswordPolicy
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search: '`cloudtrail` eventName IN ("UpdateAccountPasswordPolicy","GetAccountPasswordPolicy","DeleteAccountPasswordPolicy")
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errorCode=success | stats count values(eventName) as eventName values(userAgent)
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min(_time) as firstTime max(_time) as lastTime by eventSource aws_account_id errorCode awsRegion
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userIdentity.principalId user_arn src_ip | `security_content_ctime(firstTime)` |
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`security_content_ctime(lastTime)` | `aws_password_policy_changes_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 triggered an AWS audit tool activity which may
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trigger this event.
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references:
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- https://www.trendmicro.com/cloudoneconformity/knowledge-base/aws/IAM/password-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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- Compromised User Account
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asset_type: AWS Account
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confidence: 80
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impact: 90
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message: User $user_arn$ is attempting to $eventName$ the password policy for account
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id $aws_account_id$
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mitre_attack_id:
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- T1201
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observable:
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- name: src_ip
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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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- Attacker
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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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- user_arn
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- aws_account_id
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- src_ip
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risk_score: 72
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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/T1201/aws_password_policy/cloudtrail.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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