sigmaDRL-1.1from SigmaHQ/sigma

AWS VPC Flow Logs Deleted

Detects the deletion of one or more VPC Flow Logs in AWS Elastic Compute Cloud (EC2) through the DeleteFlowLogs API call. Adversaries may delete flow logs to evade detection or remove evidence of network activity, hindering forensic investigations and visibility into malicious operations.

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Rule sourcerules/cloud/aws/cloudtrail/aws_cloudtrail_vpc_flow_logs_deleted.yml

title: AWS VPC Flow Logs Deleted
id: e386b9b5-af12-450e-afff-761730fb8a98
status: experimental
description: |
    Detects the deletion of one or more VPC Flow Logs in AWS Elastic Compute Cloud (EC2) through the DeleteFlowLogs API call.
    Adversaries may delete flow logs to evade detection or remove evidence of network activity, hindering forensic investigations and visibility into malicious operations.
references:
    - https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_DeleteFlowLogs.html
    - https://awscli.amazonaws.com/v2/documentation/api/latest/reference/ec2/delete-flow-logs.html
    - https://www.elastic.co/docs/reference/security/prebuilt-rules/rules/integrations/aws/defense_evasion_ec2_flow_log_deletion
author: Ivan Saakov
date: 2025-10-19
tags:
    - attack.defense-evasion
logsource:
    product: aws
    service: cloudtrail
detection:
    selection_event_name:
        eventName: 'DeleteFlowLogs'
    selection_status_success:
        errorCode: 'Success'
    selection_status_null:
        errorCode: null
    condition: selection_event_name and 1 of selection_status_*
falsepositives:
    - During maintenance operations or testing, authorized administrators may delete VPC Flow Logs as part of routine network management or cleanup activities.
level: high