Query: Sigma rule for Detects successful deletion or disabling of an AWS GuardDuty detector, possibly by an attacker trying to avoid detection
Matching passage: Sigma rule: Detects successful deletion or disabling of an AWS GuardDuty detector, possibly by an attacker trying to avoid detection. Logsource: aws / cloudtrail. Rule: 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-impairment - attack.t1685 - attack.t1685.002 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
Near-miss passage: Sigma rule: Detects successful logon from public IP address via SMB. This can indicate a publicly-exposed SMB port.. Logsource: windows / security. Rule: title: External Remote SMB Logon from Public IP id: 78d5cab4-557e-454f-9fb9-a222bd0d5edc related: - id: 259a9cdf-c4dd-4fa2-b243-2269e5ab18a2 type: derived status: test description: Detects successful logon from public IP address via SMB. This can indicate a publicly-exposed SMB port. references: - https://www.inversecos.com/2020/04/successful-4624-anonymous-logons-to.html - https://twitter.com/Purp1eW0lf/status/1616144561965002752 author: Micah Babinski (@micahbabinski), Zach Mathis (@yamatosecurity) date: 2023-01-19 modified: 2024-03-11 tags: - attack.privilege-escalation - attack.persistence - attack.initial-access - attack.credential-access - attack.stealth - attack.t1133 - attack.t1078 - attack.t1110 logsource: product: windows service: security detection: selection: EventID: 4624 LogonType: 3 filter_main_local_ranges: IpAddress|cidr: - ::1/128 - 10.0.0.0/8 - 127.0.0.0/8 - 172.16.0.0/12 - 192.168.0.0/16 - 169.254.0.0/16 - fc00::/7 - fe80::/10 filter_main_empty: IpAddress: '-' condition: selection and not 1 of filter_main_* falsepositives: - Legitimate or intentional inbound connections from public IP addresses on the SMB port. level: high