Name:ASL AWS Defense Evasion Impair Security Services id:5029b681-0462-47b7-82e7-f7e3d37f5a2d version:7 date:2025-02-10 author:Patrick Bareiss, Bhavin Patel, Gowthamaraj Rajendran, Splunk status:production type:Hunting Description:The following analytic detects the deletion of critical AWS Security Services configurations, such as CloudWatch alarms, GuardDuty detectors, and Web Application Firewall rules. It leverages Amazon Security Lake logs to identify specific API calls like "DeleteLogStream" and "DeleteDetector." This activity is significant because adversaries often use these actions to disable security monitoring and evade detection. If confirmed malicious, this could allow attackers to operate undetected, leading to potential data breaches, unauthorized access, and prolonged persistence within the AWS environment. Data_source:
-ASL AWS CloudTrail
search:`amazon_security_lake` api.operation IN ("DeleteLogStream","DeleteDetector","DeleteIPSet","DeleteWebACL","DeleteRule","DeleteRuleGroup","DeleteLoggingConfiguration","DeleteAlarms") | fillnull | stats count min(_time) as firstTime max(_time) as lastTime by actor.user.uid api.operation api.service.name http_request.user_agent src_endpoint.ip actor.user.account.uid cloud.provider cloud.region | rename actor.user.uid as user api.operation as action api.service.name as dest http_request.user_agent as user_agent src_endpoint.ip as src actor.user.account.uid as vendor_account cloud.provider as vendor_product cloud.region as vendor_region | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `asl_aws_defense_evasion_impair_security_services_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:While this search has no known false positives, it is possible that it is a legitimate admin activity. Please consider filtering out these noisy events using userAgent, user_arn field names. References: -https://docs.aws.amazon.com/cli/latest/reference/guardduty/index.html -https://docs.aws.amazon.com/cli/latest/reference/waf/index.html -https://www.elastic.co/guide/en/security/current/prebuilt-rules.html drilldown_searches:
: tags: analytic_story: - 'AWS Defense Evasion' asset_type:AWS Account mitre_attack_id: - 'T1562.008' product: - 'Splunk Enterprise' - 'Splunk Enterprise Security' - 'Splunk Cloud' security_domain:threat
