diff --git a/rules/cloud/aws/cloudtrail/aws_cloudtrail_guardduty_detector_deleted_or_updated.yml b/rules/cloud/aws/cloudtrail/aws_cloudtrail_guardduty_detector_deleted_or_updated.yml
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+title: AWS GuardDuty Detector Deleted Or Updated
+id: d2656e78-c069-4571-8220-9e0ab5913f19
+status: experimental
+description: |
+    Detects successful deletion or disabling of an AWS GuardDuty detector, possibly by an attacker trying to avoid detection of its malicious activities.
+    Upon deletion, GuardDuty stops monitoring the environment and all existing findings are lost.
+    Verify with the user identity that this activity is legitimate.
+references:
+    - https://docs.aws.amazon.com/guardduty/latest/APIReference/API_DeleteDetector.html
+    - https://docs.aws.amazon.com/guardduty/latest/APIReference/API_UpdateDetector.html
+    - https://docs.aws.amazon.com/guardduty/latest/ug/guardduty_suspend-disable.html
+    - https://docs.datadoghq.com/security/default_rules/719-39f-9cd/
+    - https://docs.prismacloud.io/en/enterprise-edition/policy-reference/aws-policies/aws-general-policies/ensure-aws-guardduty-detector-is-enabled
+    - https://docs.stellarcyber.ai/5.2.x/Using/ML/Alert-Rule-Based-Potentially_Malicious_AWS_Activity.html
+    - https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Amazon%20Web%20Services/Analytic%20Rules/AWS_GuardDutyDisabled.yaml
+    - https://github.com/elastic/detection-rules/blob/main/rules/integrations/aws/defense_evasion_guardduty_detector_deletion.toml
+    - https://help.fortinet.com/fsiem/Public_Resource_Access/7_4_0/rules/PH_RULE_AWS_GuardDuty_Detector_Deletion.htm
+    - https://research.splunk.com/sources/5d8bd475-c8bc-4447-b27f-efa508728b90/
+    - https://suktech24.com/2025/07/17/aws-threat-detection-rule-guardduty-detector-disabled-or-suspended/
+    - https://www.atomicredteam.io/atomic-red-team/atomics/T156001#atomic-test-46---aws---guardduty-suspension-or-deletion
+author: suktech24
+date: 2025-11-27
+tags:
+    - attack.defense-evasion
+    - attack.t1562.001
+    - attack.t1562.008
+logsource:
+    product: aws
+    service: cloudtrail
+detection:
+    selection_event_source:
+        eventSource: 'guardduty.amazonaws.com'
+    selection_action_delete:
+        eventName: 'DeleteDetector'
+    selection_action_update:
+        eventName: 'UpdateDetector'
+        requestParameters.enable: 'false'
+    selection_status_success:
+        errorCode: 'Success'
+    selection_status_null:
+        errorCode: null
+    condition: selection_event_source and 1 of selection_action_* and 1 of selection_status_*
+falsepositives:
+    - Legitimate detector deletion by an admin (e.g., during account decommissioning).
+    - Temporary disablement for troubleshooting (verify via change management tickets).
+    - Automated deployment tools (e.g. Terraform) managing GuardDuty state.
+level: high