Name:ASL AWS Defense Evasion Delete CloudWatch Log Group id:0f701b38-a0fb-43fd-a83d-d12265f71f33 version:7 date:2025-02-10 author:Patrick Bareiss, Splunk status:production type:TTP Description:The following analytic detects the deletion of CloudWatch log groups in AWS, identified through `DeleteLogGroup` events in CloudTrail logs. This method leverages Amazon Security Lake logs parsed in the OCSF format. The activity is significant because attackers may delete log groups to evade detection and disrupt logging capabilities, hindering incident response efforts. If confirmed malicious, this action could allow attackers to cover their tracks, making it difficult to trace their activities and potentially leading to undetected data breaches or further malicious actions within the compromised AWS environment. Data_source:
-ASL AWS CloudTrail
search:`amazon_security_lake` api.operation=DeleteLogGroup | 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_delete_cloudwatch_log_group_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 an AWS admin has deleted CloudWatch logging. Please investigate this activity. References: -https://attack.mitre.org/techniques/T1562/008/ drilldown_searches: name:'View the detection results for - "$user$"' search:'%original_detection_search% | search user = "$user$"' 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 Defense Evasion' asset_type:AWS Account mitre_attack_id: - 'T1562.008' product: - 'Splunk Enterprise' - 'Splunk Enterprise Security' - 'Splunk Cloud' security_domain:threat
