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.stealth
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

title: Application Using Device Code Authentication Flow
id: 248649b7-d64f-46f0-9fb2-a52774166fb5
status: test
description: |
    Device code flow is an OAuth 2.0 protocol flow specifically for input constrained devices and is not used in all environments.
    If this type of flow is seen in the environment and not being used in an input constrained device scenario, further investigation is warranted.
    This can be a misconfigured application or potentially something malicious.
references:
    - https://learn.microsoft.com/en-us/entra/architecture/security-operations-applications#application-authentication-flows
author: Mark Morowczynski '@markmorow', Bailey Bercik '@baileybercik'
date: 2022-06-01
tags:
    - attack.stealth
    - attack.t1078
    - attack.persistence
    - attack.privilege-escalation
    - attack.initial-access
logsource:
    product: azure
    service: signinlogs
detection:
    selection:
        properties.message: Device Code
    condition: selection
falsepositives:
    - Applications that are input constrained will need to use device code flow and are valid authentications.
level: medium

title: Applications That Are Using ROPC Authentication Flow
id: 55695bc0-c8cf-461f-a379-2535f563c854
status: test
description: |
    Resource owner password credentials (ROPC) should be avoided if at all possible as this requires the user to expose their current password credentials to the application directly.
    The application then uses those credentials to authenticate the user against the identity provider.
references:
    - https://learn.microsoft.com/en-us/entra/architecture/security-operations-applications#application-authentication-flows
author: Mark Morowczynski '@markmorow', Bailey Bercik '@baileybercik'
date: 2022-06-01
tags:
    - attack.stealth
    - attack.t1078
    - attack.persistence
    - attack.privilege-escalation
    - attack.initial-access
logsource:
    product: azure
    service: signinlogs
detection:
    selection:
        properties.message: ROPC
    condition: selection
falsepositives:
    - Applications that are being used as part of automated testing or a legacy application that cannot use any other modern authentication flow
level: medium