Name:ASL AWS IAM Successful Group Deletion id:1bbe54f1-93d7-4764-8a01-ddaa12ece7ac version:5 date:2024-10-22 author:Patrick Bareiss, Splunk status:production type:Hunting Description:The following analytic detects the successful deletion of a group within AWS IAM, leveraging CloudTrail IAM events. This action, while not inherently malicious, can serve as a precursor to more sinister activities, such as unauthorized access or privilege escalation attempts. By monitoring for such deletions, the analytic aids in identifying potential preparatory steps towards an attack, allowing for early detection and mitigation. The identification of this behavior is crucial for a SOC to prevent the potential impact of an attack, which could include unauthorized access to sensitive resources or disruption of AWS environment operations. Data_source:
-ASL AWS CloudTrail
search:`amazon_security_lake` api.operation=DeleteGroup status=Success | 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 | 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_iam_successful_group_deletion_filter`
how_to_implement:You must install the Data Lake Federated Analytics App and ingest the logs into Splunk. known_false_positives:This detection will require tuning to provide high fidelity detection capabilties. Tune based on src addresses (corporate offices, VPN terminations) or by groups of users. Not every user with AWS access should have permission to delete groups (least privilege). References: -https://awscli.amazonaws.com/v2/documentation/api/latest/reference/iam/delete-group.html -https://docs.aws.amazon.com/IAM/latest/APIReference/API_DeleteGroup.html drilldown_searches:
: tags: analytic_story: - 'AWS IAM Privilege Escalation' asset_type:AWS Account confidence:50 impact:10 message:User $user$ has sucessfully deleted a user group from $src_ip$ mitre_attack_id: - 'T1069.003' - 'T1098' - 'T1069' 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:5 security_domain:access
