GCP VPC Flow Logs Disabled

Description

VPC flow logs were disabled for a subnet.

Query · python

def rule(event):
    return all(
        [
            event.get("protoPayload"),
            event.deep_get("protoPayload", "methodName", default="")
            == "v1.compute.subnetworks.patch",
            event.deep_get("protoPayload", "request", "enableFlowLogs") is False,
        ]
    )


def title(event):
    actor = event.deep_get(
        "protoPayload", "authenticationInfo", "principalEmail", default="<ACTOR_NOT_FOUND>"
    )
    resource = event.deep_get("protoPayload", "resourceName", default="<RESOURCE_NOT_FOUND>")
    return f"GCP: [{actor}] disabled VPC Flow Logs for [{resource}]"
Raw source GCP VPC Flow Logs Disabled · Panther Python
Esc
Published by panther-labs/panther-analysis ↗, licensed under Apache 2.0 ↗. Reproduced here unmodified. 
AnalysisType: rule
Description: VPC flow logs were disabled for a subnet.
DisplayName: "GCP VPC Flow Logs Disabled"
Enabled: true
Filename: gcp_vpc_flow_logs_disabled.py
Reference: https://cloud.google.com/vpc/docs/using-flow-logs
Severity: Medium
Tests:
  - ExpectedResult: true
    Log:
      insertId: "123456"
      logName: projects/gcp-project/logs/cloudaudit.googleapis.com%2Factivity
      operation:
        first: true
        id: operation-abc-123
        last: true
        producer: compute.googleapis.com
      p_any_ip_addresses:
        - 1.2.3.4
      p_event_time: "2023-03-08 18:52:58.322"
      p_log_type: GCP.AuditLog
      p_parse_time: "2023-03-08 18:54:14.597"
      p_source_label: gcplogsource
      protoPayload:
        at_sign_type: type.googleapis.com/google.cloud.audit.AuditLog
        authenticationInfo:
          principalEmail: user1@company.io
        authorizationInfo:
          - granted: true
            permission: compute.subnetworks.update
            resourceAttributes:
              name: projects/gcp-project/regions/us-central1/subnetworks/default
              service: compute
              type: compute.subnetworks
        methodName: v1.compute.subnetworks.patch
        request:
          "@type": type.googleapis.com/compute.subnetworks.patch
          enableFlowLogs: false
          fingerprint: "/�/��\x03��"
        requestMetadata:
          callerIP: 1.2.3.4
          callerSuppliedUserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/110.0.0.0 Safari/537.36,gzip(gfe),gzip(gfe)
          destinationAttributes: {}
          requestAttributes:
            auth: {}
            reason: 8uSywAYQGg5Db2xpc2V1bSBGbG93cw
            time: "2023-03-08T18:52:58.731721Z"
        resourceName: projects/gcp-project/regions/us-central1/subnetworks/default
        response:
          "@type": type.googleapis.com/operation
          endTime: "2023-03-08T10:52:58.700-08:00"
          id: "123456"
          insertTime: "2023-03-08T10:52:58.699-08:00"
          name: operation-1678301578299-5f668096688bc-0635b6ef-4d0122bb
          operationType: compute.subnetworks.patch
          progress: "100"
          region: https://www.googleapis.com/compute/v1/projects/gcp-project/regions/us-central1
          selfLink: https://www.googleapis.com/compute/v1/projects/gcp-project/regions/us-central1/operations/1234
          selfLinkWithId: https://www.googleapis.com/compute/v1/projects/gcp-project/regions/us-central1/operations/1234
          startTime: "2023-03-08T10:52:58.700-08:00"
          status: DONE
          targetId: "123456"
          targetLink: https://www.googleapis.com/compute/v1/projects/gcp-project/regions/us-central1/subnetworks/default
          user: user1@company.io
        serviceName: compute.googleapis.com
      receiveTimestamp: "2023-03-08 18:52:58.991"
      resource:
        labels:
          location: us-central1
          project_id: gcp-project
          subnetwork_id: "123456"
          subnetwork_name: default
        type: gce_subnetwork
      severity: NOTICE
      timestamp: "2023-03-08 18:52:58.322"
    Name: Disable Flow Logs Event
  - ExpectedResult: false
    Log:
      insertId: "12345"
      logName: projects/test-project/logs/cloudaudit.googleapis.com%2Factivity
      operation:
        first: true
        id: operation-abcdefg-1234567
        last: true
        producer: compute.googleapis.com
      p_any_ip_addresses:
        - 1.2.3.4
      p_event_time: "2023-03-08 18:52:52.114"
      p_log_type: GCP.AuditLog
      p_parse_time: "2023-03-08 18:54:14.595"
      p_row_id: 5e7586fcbb73fdeed985ebeb16bd0c
      p_source_id: 4fc88a5a-2d51-4279-9c4a-08fa7cc52566
      p_source_label: gcplogsource
      protoPayload:
        at_sign_type: type.googleapis.com/google.cloud.audit.AuditLog
        authenticationInfo:
          principalEmail: user1@company.io
        authorizationInfo:
          - granted: true
            permission: compute.subnetworks.update
            resourceAttributes:
              name: projects/test-project/regions/us-central1/subnetworks/default
              service: compute
              type: compute.subnetworks
        methodName: v1.compute.subnetworks.patch
        request:
          "@type": type.googleapis.com/compute.subnetworks.patch
          fingerprint: "/�/��\x03��"
          logConfig:
            enable: true
        requestMetadata:
          callerIP: 1.2.3.4
          callerSuppliedUserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/110.0.0.0 Safari/537.36,gzip(gfe),gzip(gfe)
          destinationAttributes: {}
          requestAttributes:
            auth: {}
            reason: 8uSywAYQGg5Db2xpc2V1bSBGbG93cw
            time: "2023-03-08T18:52:52.558899Z"
        resourceName: projects/test-project/regions/us-central1/subnetworks/default
        response:
          "@type": type.googleapis.com/operation
          endTime: "2023-03-08T10:52:52.510-08:00"
          id: "9876543210"
          insertTime: "2023-03-08T10:52:52.509-08:00"
          name: operation-abcdefg-1234567
          operationType: compute.subnetworks.patch
          progress: "100"
          region: https://www.googleapis.com/compute/v1/projects/test-project/regions/us-central1
          selfLink: https://www.googleapis.com/compute/v1/projects/test-project/regions/us-central1/operations/operation-abcdefg-1234567
          selfLinkWithId: https://www.googleapis.com/compute/v1/projects/test-project/regions/us-central1/operations/9876543210
          startTime: "2023-03-08T10:52:52.510-08:00"
          status: DONE
          targetId: "567854321"
          targetLink: https://www.googleapis.com/compute/v1/projects/test-project/regions/us-central1/subnetworks/default
          user: user1@company.io
        serviceName: compute.googleapis.com
      receiveTimestamp: "2023-03-08 18:52:52.72"
      resource:
        labels:
          location: us-central1
          project_id: test-project
          subnetwork_id: "567854321"
          subnetwork_name: default
        type: gce_subnetwork
      severity: NOTICE
      timestamp: "2023-03-08 18:52:52.114"
    Name: Enable Flow Logs Event
DedupPeriodMinutes: 60
LogTypes:
  - GCP.AuditLog
RuleID: "GCP.VPC.Flow.Logs.Disabled"
Threshold: 1


# ------ paired body: gcp_vpc_flow_logs_disabled.py ------

def rule(event):
    return all(
        [
            event.get("protoPayload"),
            event.deep_get("protoPayload", "methodName", default="")
            == "v1.compute.subnetworks.patch",
            event.deep_get("protoPayload", "request", "enableFlowLogs") is False,
        ]
    )


def title(event):
    actor = event.deep_get(
        "protoPayload", "authenticationInfo", "principalEmail", default="<ACTOR_NOT_FOUND>"
    )
    resource = event.deep_get("protoPayload", "resourceName", default="<RESOURCE_NOT_FOUND>")
    return f"GCP: [{actor}] disabled VPC Flow Logs for [{resource}]"

Detection rules belong to the projects that publish them and remain under their own licenses. This site indexes and links to them; it claims no rights in them.