Name:ASL AWS Credential Access GetPasswordData id:a79b607a-50cc-4704-bb9d-eff280cb78c2 version:1 date:2024-12-12 author:Patrick Bareiss, Splunk status:production type:Anomaly Description:The following analytic identifiesGetPasswordData API calls in your AWS account. It leverages CloudTrail logs from Amazon Security Lake 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:
-ASL AWS CloudTrail
search:`amazon_security_lake` api.operation=GetPasswordData | spath input=api.request.data | fillnull | stats count min(_time) as firstTime max(_time) as lastTime by api.operation actor.user.uid actor.user.account.uid http_request.user_agent src_endpoint.ip cloud.region instanceId | rename actor.user.uid as user, src_endpoint.ip as src_ip, cloud.region as region, http_request.user_agent as user_agent | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` |`asl_aws_credential_access_getpassworddata_filter`
how_to_implement:The detection is based on Amazon Security Lake events from Amazon Web Services (AWS), which is a centralized data lake that provides security-related data from AWS services. To use this detection, you must ingest CloudTrail logs from Amazon Security Lake into Splunk. To run this search, ensure that you ingest events using the latest version of Splunk Add-on for Amazon Web Services (https://splunkbase.splunk.com/app/1876) or the Federated Analytics App. 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 - "$user$"' search:'%original_detection_search% | search user_arn = "$user$"' earliest_offset:'$info_min_time$' latest_offset:'$info_max_time$' name:'View risk events for the last 7 days for - "$user$"' search:'| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$user$") 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 $user$ is seen to make `GetPasswordData` API calls mitre_attack_id: - 'T1586' - 'T1586.003' - 'T1110' - 'T1110.001' observable: name:'src_ip' type:'IP Address' - role: - 'Attacker' name:'user' type:'User' - role: - 'Victim' product: - 'Splunk Enterprise' - 'Splunk Enterprise Security' - 'Splunk Cloud' required_fields: - 'api.operation' - 'actor.user.uid' - 'actor.user.account.uid' - 'http_request.user_agent' - 'src_endpoint.ip' - 'src_endpoint.domain' - 'cloud.region' risk_score:49 security_domain:threat
