Name:ASL AWS Password Policy Changes id:5ade5937-11a2-4363-ba6b-39a3ee8d5b1a version:2 date:2024-10-17 author:Patrick Bareiss, Splunk status:deprecated type:Hunting Description:This search looks for AWS CloudTrail events from Amazon Security Lake where a user is making successful API calls to view/update/delete the existing password policy in an AWS organization. It is unlikely for a regular user to conduct this operation. These events may potentially be malicious, adversaries often use this information to gain more understanding of the password defenses in place and exploit them to increase their attack surface when a user account is compromised. Data_source:
search:`amazon_security_lake` "api.service.name"="iam.amazonaws.com" "api.operation" IN ("UpdateAccountPasswordPolicy","GetAccountPasswordPolicy","DeleteAccountPasswordPolicy") "api.response.error"=null | stats count min(_time) as firstTime max(_time) as lastTime by identity.user.account_uid identity.user.credential_uid identity.user.name identity.user.type identity.user.uid identity.user.uuid http_request.user_agent src_endpoint.ip cloud.region | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `asl_aws_password_policy_changes_filter`
how_to_implement:You must install Splunk Add-On for AWS Version v7.0.0 (https://splunkbase.splunk.com/app/1876) that includes includes a merge of all the capabilities of the Splunk Add-on for Amazon Security Lake. This search works with Amazon Security Lake logs which are parsed in the Open Cybersecurity Schema Framework (OCSF)format. known_false_positives:While this search has no known false positives, it is possible that an AWS admin has legitimately triggered an AWS audit tool activity which may trigger this event. References: -https://www.trendmicro.com/cloudoneconformity/knowledge-base/aws/IAM/password-policy.html drilldown_searches:
: tags: analytic_story: - 'AWS IAM Privilege Escalation' - 'Compromised User Account' asset_type:AWS Account confidence:80 impact:90 message:User $identity.user.name$ is attempting to $api.operation$ the password policy for accounts mitre_attack_id: - 'T1201' observable: name:'src_endpoint.ip' type:'IP Address' - role: - 'Attacker' name:'identity.user.name' type:'User' - role: - 'Attacker' product: - 'Splunk Enterprise' - 'Splunk Enterprise Security' - 'Splunk Cloud' required_fields: - 'api.service.name' - 'api.operation' - 'identity.user.account_uid' - 'identity.user.credential_uid' - 'identity.user.name' - 'identity.user.type' - 'identity.user.uid' - 'identity.user.uuid' - 'http_request.user_agent' - 'src_endpoint.ip' risk_score:72 security_domain:threat
