Name:AWS Password Policy Changes id:aee4a575-7064-4e60-b511-246f9baf9895 version:3 date:2024-10-17 author:Bhavin Patel, Splunk status:production type:Hunting Description:The following analytic detects successful API calls to view, update, or delete the password policy in an AWS organization. It leverages AWS CloudTrail logs to identify events such as "UpdateAccountPasswordPolicy," "GetAccountPasswordPolicy," and "DeleteAccountPasswordPolicy." This activity is significant because it is uncommon for regular users to perform these actions, and such changes can indicate an adversary attempting to understand or weaken password defenses. If confirmed malicious, this could lead to compromised accounts and increased attack surface, potentially allowing unauthorized access and control over AWS resources. Data_source:
-AWS CloudTrail UpdateAccountPasswordPolicy
-AWS CloudTrail GetAccountPasswordPolicy
-AWS CloudTrail DeleteAccountPasswordPolicy
search:`cloudtrail` eventName IN ("UpdateAccountPasswordPolicy","GetAccountPasswordPolicy","DeleteAccountPasswordPolicy") errorCode=success | stats count values(eventName) as eventName values(userAgent) min(_time) as firstTime max(_time) as lastTime by eventSource aws_account_id errorCode awsRegion userIdentity.principalId user_arn src_ip | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `aws_password_policy_changes_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 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 $user_arn$ is attempting to $eventName$ the password policy for account id $aws_account_id$ mitre_attack_id: - 'T1201' observable: name:'src_ip' type:'IP Address' - role: - 'Attacker' name:'user_arn' type:'User' - role: - 'Attacker' product: - 'Splunk Enterprise' - 'Splunk Enterprise Security' - 'Splunk Cloud' required_fields: - '_time' - 'eventName' - 'userAgent' - 'errorCode' - 'requestParameters.userName' - 'eventSource' - 'user_arn' - 'aws_account_id' - 'src_ip' risk_score:72 security_domain:threat
