Name:AWS Credential Access GetPasswordData id:4d347c4a-306e-41db-8d10-b46baf71b3e2 version:3 date:2024-09-30 author:Bhavin Patel, Splunk status:production type:Anomaly Description:The following analytic identifies more than 10 GetPasswordData API calls within a 5-minute window in your AWS account. It leverages AWS CloudTrail logs to detect this activity by counting the distinct instance IDs accessed. This behavior is significant as it may indicate an attempt to retrieve encrypted administrator passwords for running Windows instances, which is a critical security concern. If confirmed malicious, attackers could gain unauthorized access to administrative credentials, potentially leading to full control over the affected instances and further compromise of the AWS environment. Data_source:
-AWS CloudTrail GetPasswordData
search:`cloudtrail` eventName=GetPasswordData eventSource = ec2.amazonaws.com | bin _time span=5m | stats count values(errorCode) as errorCode dc(requestParameters.instanceId) as distinct_instance_ids values(requestParameters.instanceId) as instance_ids by aws_account_id src_ip user_arn userAgent eventName _time | where distinct_instance_ids > 10 | `aws_credential_access_getpassworddata_filter`
how_to_implement:You must install splunk AWS add on and Splunk App for AWS. This search works with AWS CloudTrail logs. We encourage the users to adjust the values of `distinct_instance_ids` and tweak the `span` value according to their environment. known_false_positives:Administrator tooling or automated scripts may make these calls but it is highly unlikely to make several calls in a short period of time. References: -https://attack.mitre.org/techniques/T1552/ -https://stratus-red-team.cloud/attack-techniques/AWS/aws.credential-access.ec2-get-password-data/ drilldown_searches: name:'View the detection results for - "$user_arn$"' search:'%original_detection_search% | search user_arn = "$user_arn$"' earliest_offset:'$info_min_time$' latest_offset:'$info_max_time$' name:'View risk events for the last 7 days for - "$user_arn$"' search:'| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$user_arn$") starthoursago=168 | stats count min(_time) as firstTime max(_time) as lastTime values(search_name) as "Search Name" values(risk_message) as "Risk Message" values(analyticstories) as "Analytic Stories" values(annotations._all) as "Annotations" values(annotations.mitre_attack.mitre_tactic) as "ATT&CK Tactics" by normalized_risk_object | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`' earliest_offset:'$info_min_time$' latest_offset:'$info_max_time$' tags: analytic_story: - 'AWS Identity and Access Management Account Takeover' asset_type:AWS Account confidence:70 impact:70 message:User $user_arn$ is seen to make mulitple `GetPasswordData` API calls to instance ids $instance_ids$ from IP $src_ip$ mitre_attack_id: - 'T1586' - 'T1586.003' - 'T1110' - 'T1110.001' observable: name:'src_ip' type:'IP Address' - role: - 'Attacker' name:'user_arn' type:'User' - role: - 'Victim' product: - 'Splunk Enterprise' - 'Splunk Enterprise Security' - 'Splunk Cloud' required_fields: - '_time' - 'eventName' - 'eventSource' - 'userIdentity.userName' - 'userAgent' - 'userIdentity.accountId' - 'sourceIPAddress' - 'awsRegion' risk_score:49 security_domain:threat
