AWS VPC Flow Logs

Severity: medium
Compliance: CIS 2.9
Tags: AWS, Security Control, Defense Evasion:Impair Defenses
Reference: https://docs.aws.amazon.com/vpc/latest/userguide/flow-logs.html
Source: github.com/panther-labs/panther-analysis

This policy validates that AWS VPCs (Virtual Private Clouds) have network flow logging enabled.

MITRE ATT&CK coverage

Tactic	Techniques
Stealth	`T1562` Impair Defenses

Rule body yaml

AnalysisType: policy
Filename: aws_vpc_flow_logs.py
PolicyID: "AWS.VPC.FlowLogs"
DisplayName: "AWS VPC Flow Logs"
Enabled: true
ResourceTypes:
  - AWS.EC2.VPC
Tags:
  - AWS
  - Security Control
  - Defense Evasion:Impair Defenses
Reports:
  CIS:
    - 2.9
  MITRE ATT&CK:
    - TA0005:T1562
Severity: Medium
Description: >
  This policy validates that AWS VPCs (Virtual Private Clouds) have network flow logging enabled.
Runbook: >
  https://docs.runpanther.io/alert-runbooks/built-in-policies/aws-vpc-flow-logging-enabled
Reference: https://docs.aws.amazon.com/vpc/latest/userguide/flow-logs.html
Tests:
  - Name: Flow Logging Not Enabled
    ExpectedResult: false
    Resource:
      {
        "CidrBlock": "172.31.0.0/16",
        "CidrBlockAssociationSet":
          [
            {
              "AssociationId": "vpc-cidr-assoc-112233",
              "CidrBlock": "172.0.0.0/16",
              "CidrBlockState":
                { "State": "associated", "StatusMessage": null },
            },
          ],
        "DhcpOptionsId": "dopt-1122e3344",
        "FlowLogs": null,
        "InstanceTenancy": "default",
        "Ipv6CidrBlockAssociationSet": null,
        "IsDefault": true,
        "NetworkAcls":
          [
            {
              "Associations":
                [
                  {
                    "NetworkAclAssociationId": "aclassoc-1122abc444",
                    "NetworkAclId": "acl-123abc",
                    "SubnetId": "subnet-123abc",
                  },
                  {
                    "NetworkAclAssociationId": "aclassoc-123abc",
                    "NetworkAclId": "acl-1122abc",
                    "SubnetId": "subnet-112233aabb",
                  },
                ],
              "Entries":
                [
                  {
                    "CidrBlock": "0.0.0.0/0",
                    "Egress": false,
                    "IcmpTypeCode": null,
                    "Ipv6CidrBlock": null,
                    "PortRange": null,
                    "Protocol": "-1",
                    "RuleAction": "deny",
                    "RuleNumber": 12345,
                  },
                ],
              "IsDefault": true,
              "NetworkAclId": "acl-123aabb",
              "OwnerId": "112233445566",
              "Tags": null,
              "VpcId": "vpc-1234321",
            },
          ],
        "OwnerId": "112233445566",
        "RouteTables":
          [
            {
              "Associations":
                [
                  {
                    "Main": true,
                    "RouteTableAssociationId": "rtbassoc-1122aa33",
                    "RouteTableId": "rtb-1122abc33",
                    "SubnetId": null,
                  },
                ],
              "OwnerId": "112233445566",
              "PropagatingVgws": null,
              "RouteTableId": "rtb-11223344",
              "Routes":
                [
                  {
                    "DestinationCidrBlock": "0.0.0.0/0",
                    "DestinationIpv6CidrBlock": null,
                    "DestinationPrefixListId": null,
                    "EgressOnlyInternetGatewayId": null,
                    "GatewayId": "igw-abc123",
                    "InstanceId": null,
                    "InstanceOwnerId": null,
                    "NatGatewayId": null,
                    "NetworkInterfaceId": null,
                    "Origin": "CreateRoute",
                    "State": "active",
                    "TransitGatewayId": null,
                    "VpcPeeringConnectionId": null,
                  },
                ],
              "Tags": null,
              "VpcId": "vpc-11223344",
            },
          ],
        "SecurityGroups":
          [
            {
              "Description": "default VPC security group",
              "GroupId": "sg-abc123",
              "GroupName": "default",
              "IpPermissions":
                [
                  {
                    "FromPort": null,
                    "IpProtocol": "-1",
                    "IpRanges": null,
                    "Ipv6Ranges": null,
                    "PrefixListIds": null,
                    "ToPort": null,
                    "UserIdGroupPairs":
                      [
                        {
                          "Description": null,
                          "GroupId": "sg-abc123",
                          "GroupName": null,
                          "PeeringStatus": null,
                          "UserId": "1122334455",
                          "VpcId": null,
                          "VpcPeeringConnectionId": null,
                        },
                      ],
                  },
                ],
              "IpPermissionsEgress":
                [
                  {
                    "FromPort": null,
                    "IpProtocol": "-1",
                    "IpRanges":
                      [{ "CidrIp": "0.0.0.0/0", "Description": null }],
                    "Ipv6Ranges": null,
                    "PrefixListIds": null,
                    "ToPort": null,
                    "UserIdGroupPairs": null,
                  },
                ],
              "OwnerId": "112233445566",
              "Tags": null,
              "VpcId": "vpc-123454321",
            },
          ],
        "State": "available",
        "Tags": null,
        "VpcId": "vpc-1234321",
      }
  - Name: Flow Logs Enabled For Type ACCEPT
    ExpectedResult: false
    Resource:
      {
        "CidrBlock": "172.31.0.0/16",
        "CidrBlockAssociationSet":
          [
            {
              "AssociationId": "vpc-cidr-assoc-112233",
              "CidrBlock": "172.0.0.0/16",
              "CidrBlockState":
                { "State": "associated", "StatusMessage": null },
            },
          ],
        "DhcpOptionsId": "dopt-1122e3344",
        "FlowLogs":
          [
            {
              "CreationTime": "2019-07-09T17:42:04.677Z",
              "DeliverLogsErrorMessage": null,
              "DeliverLogsPermissionArn": null,
              "DeliverLogsStatus": "SUCCESS",
              "FlowLogId": "fl-09798935a87d0dbc6",
              "FlowLogStatus": "ACTIVE",
              "LogDestination": "arn:aws:s3:::panther-test-vpc-flow-logs",
              "LogDestinationType": "s3",
              "LogGroupName": null,
              "ResourceId": "vpc-094cd5323fa3206f6",
              "TrafficType": "ACCEPT",
            },
          ],
        "InstanceTenancy": "default",
        "Ipv6CidrBlockAssociationSet": null,
        "IsDefault": true,
        "NetworkAcls":
          [
            {
              "Associations":
                [
                  {
                    "NetworkAclAssociationId": "aclassoc-1122abc444",
                    "NetworkAclId": "acl-123abc",
                    "SubnetId": "subnet-123abc",
                  },
                  {
                    "NetworkAclAssociationId": "aclassoc-123abc",
                    "NetworkAclId": "acl-1122abc",
                    "SubnetId": "subnet-112233aabb",
                  },
                ],
              "Entries":
                [
                  {
                    "CidrBlock": "0.0.0.0/0",
                    "Egress": false,
                    "IcmpTypeCode": null,
                    "Ipv6CidrBlock": null,
                    "PortRange": null,
                    "Protocol": "-1",
                    "RuleAction": "deny",
                    "RuleNumber": 12345,
                  },
                ],
              "IsDefault": true,
              "NetworkAclId": "acl-123aabb",
              "OwnerId": "112233445566",
              "Tags": null,
              "VpcId": "vpc-1234321",
            },
          ],
        "OwnerId": "112233445566",
        "RouteTables":
          [
            {
              "Associations":
                [
                  {
                    "Main": true,
                    "RouteTableAssociationId": "rtbassoc-1122aa33",
                    "RouteTableId": "rtb-1122abc33",
                    "SubnetId": null,
                  },
                ],
              "OwnerId": "112233445566",
              "PropagatingVgws": null,
              "RouteTableId": "rtb-11223344",
              "Routes":
                [
                  {
                    "DestinationCidrBlock": "0.0.0.0/0",
                    "DestinationIpv6CidrBlock": null,
                    "DestinationPrefixListId": null,
                    "EgressOnlyInternetGatewayId": null,
                    "GatewayId": "igw-abc123",
                    "InstanceId": null,
                    "InstanceOwnerId": null,
                    "NatGatewayId": null,
                    "NetworkInterfaceId": null,
                    "Origin": "CreateRoute",
                    "State": "active",
                    "TransitGatewayId": null,
                    "VpcPeeringConnectionId": null,
                  },
                ],
              "Tags": null,
              "VpcId": "vpc-11223344",
            },
          ],
        "SecurityGroups":
          [
            {
              "Description": "default VPC security group",
              "GroupId": "sg-abc123",
              "GroupName": "default",
              "IpPermissions":
                [
                  {
                    "FromPort": null,
                    "IpProtocol": "-1",
                    "IpRanges": null,
                    "Ipv6Ranges": null,
                    "PrefixListIds": null,
                    "ToPort": null,
                    "UserIdGroupPairs":
                      [
                        {
                          "Description": null,
                          "GroupId": "sg-abc123",
                          "GroupName": null,
                          "PeeringStatus": null,
                          "UserId": "1122334455",
                          "VpcId": null,
                          "VpcPeeringConnectionId": null,
                        },
                      ],
                  },
                ],
              "IpPermissionsEgress":
                [
                  {
                    "FromPort": null,
                    "IpProtocol": "-1",
                    "IpRanges":
                      [{ "CidrIp": "0.0.0.0/0", "Description": null }],
                    "Ipv6Ranges": null,
                    "PrefixListIds": null,
                    "ToPort": null,
                    "UserIdGroupPairs": null,
                  },
                ],
              "OwnerId": "112233445566",
              "Tags": null,
              "VpcId": "vpc-123454321",
            },
          ],
        "State": "available",
        "Tags": null,
        "VpcId": "vpc-1234321",
      }
  - Name: Flow Logs Enabled For Type ALL
    ExpectedResult: true
    Resource:
      {
        "CidrBlock": "172.31.0.0/16",
        "CidrBlockAssociationSet":
          [
            {
              "AssociationId": "vpc-cidr-assoc-112233",
              "CidrBlock": "172.0.0.0/16",
              "CidrBlockState":
                { "State": "associated", "StatusMessage": null },
            },
          ],
        "DhcpOptionsId": "dopt-1122e3344",
        "FlowLogs":
          [
            {
              "CreationTime": "2019-07-09T17:42:04.677Z",
              "DeliverLogsErrorMessage": null,
              "DeliverLogsPermissionArn": null,
              "DeliverLogsStatus": "SUCCESS",
              "FlowLogId": "fl-09798935a87d0dbc6",
              "FlowLogStatus": "ACTIVE",
              "LogDestination": "arn:aws:s3:::panther-test-vpc-flow-logs",
              "LogDestinationType": "s3",
              "LogGroupName": null,
              "ResourceId": "vpc-094cd5323fa3206f6",
              "TrafficType": "ALL",
            },
          ],
        "InstanceTenancy": "default",
        "Ipv6CidrBlockAssociationSet": null,
        "IsDefault": true,
        "NetworkAcls":
          [
            {
              "Associations":
                [
                  {
                    "NetworkAclAssociationId": "aclassoc-1122abc444",
                    "NetworkAclId": "acl-123abc",
                    "SubnetId": "subnet-123abc",
                  },
                  {
                    "NetworkAclAssociationId": "aclassoc-123abc",
                    "NetworkAclId": "acl-1122abc",
                    "SubnetId": "subnet-112233aabb",
                  },
                ],
              "Entries":
                [
                  {
                    "CidrBlock": "0.0.0.0/0",
                    "Egress": false,
                    "IcmpTypeCode": null,
                    "Ipv6CidrBlock": null,
                    "PortRange": null,
                    "Protocol": "-1",
                    "RuleAction": "deny",
                    "RuleNumber": 12345,
                  },
                ],
              "IsDefault": true,
              "NetworkAclId": "acl-123aabb",
              "OwnerId": "112233445566",
              "Tags": null,
              "VpcId": "vpc-1234321",
            },
          ],
        "OwnerId": "112233445566",
        "RouteTables":
          [
            {
              "Associations":
                [
                  {
                    "Main": true,
                    "RouteTableAssociationId": "rtbassoc-1122aa33",
                    "RouteTableId": "rtb-1122abc33",
                    "SubnetId": null,
                  },
                ],
              "OwnerId": "112233445566",
              "PropagatingVgws": null,
              "RouteTableId": "rtb-11223344",
              "Routes":
                [
                  {
                    "DestinationCidrBlock": "0.0.0.0/0",
                    "DestinationIpv6CidrBlock": null,
                    "DestinationPrefixListId": null,
                    "EgressOnlyInternetGatewayId": null,
                    "GatewayId": "igw-abc123",
                    "InstanceId": null,
                    "InstanceOwnerId": null,
                    "NatGatewayId": null,
                    "NetworkInterfaceId": null,
                    "Origin": "CreateRoute",
                    "State": "active",
                    "TransitGatewayId": null,
                    "VpcPeeringConnectionId": null,
                  },
                ],
              "Tags": null,
              "VpcId": "vpc-11223344",
            },
          ],
        "SecurityGroups":
          [
            {
              "Description": "default VPC security group",
              "GroupId": "sg-abc123",
              "GroupName": "default",
              "IpPermissions":
                [
                  {
                    "FromPort": null,
                    "IpProtocol": "-1",
                    "IpRanges": null,
                    "Ipv6Ranges": null,
                    "PrefixListIds": null,
                    "ToPort": null,
                    "UserIdGroupPairs":
                      [
                        {
                          "Description": null,
                          "GroupId": "sg-abc123",
                          "GroupName": null,
                          "PeeringStatus": null,
                          "UserId": "1122334455",
                          "VpcId": null,
                          "VpcPeeringConnectionId": null,
                        },
                      ],
                  },
                ],
              "IpPermissionsEgress":
                [
                  {
                    "FromPort": null,
                    "IpProtocol": "-1",
                    "IpRanges":
                      [{ "CidrIp": "0.0.0.0/0", "Description": null }],
                    "Ipv6Ranges": null,
                    "PrefixListIds": null,
                    "ToPort": null,
                    "UserIdGroupPairs": null,
                  },
                ],
              "OwnerId": "112233445566",
              "Tags": null,
              "VpcId": "vpc-123454321",
            },
          ],
        "State": "available",
        "Tags": null,
        "VpcId": "vpc-1234321",
      }
  - Name: Flow Logs Enabled For Type REJECT
    ExpectedResult: true
    Resource:
      {
        "CidrBlock": "172.31.0.0/16",
        "CidrBlockAssociationSet":
          [
            {
              "AssociationId": "vpc-cidr-assoc-112233",
              "CidrBlock": "172.0.0.0/16",
              "CidrBlockState":
                { "State": "associated", "StatusMessage": null },
            },
          ],
        "DhcpOptionsId": "dopt-1122e3344",
        "FlowLogs":
          [
            {
              "CreationTime": "2019-07-09T17:42:04.677Z",
              "DeliverLogsErrorMessage": null,
              "DeliverLogsPermissionArn": null,
              "DeliverLogsStatus": "SUCCESS",
              "FlowLogId": "fl-09798935a87d0dbc6",
              "FlowLogStatus": "ACTIVE",
              "LogDestination": "arn:aws:s3:::panther-test-vpc-flow-logs",
              "LogDestinationType": "s3",
              "LogGroupName": null,
              "ResourceId": "vpc-094cd5323fa3206f6",
              "TrafficType": "REJECT",
            },
          ],
        "InstanceTenancy": "default",
        "Ipv6CidrBlockAssociationSet": null,
        "IsDefault": true,
        "NetworkAcls":
          [
            {
              "Associations":
                [
                  {
                    "NetworkAclAssociationId": "aclassoc-1122abc444",
                    "NetworkAclId": "acl-123abc",
                    "SubnetId": "subnet-123abc",
                  },
                  {
                    "NetworkAclAssociationId": "aclassoc-123abc",
                    "NetworkAclId": "acl-1122abc",
                    "SubnetId": "subnet-112233aabb",
                  },
                ],
              "Entries":
                [
                  {
                    "CidrBlock": "0.0.0.0/0",
                    "Egress": false,
                    "IcmpTypeCode": null,
                    "Ipv6CidrBlock": null,
                    "PortRange": null,
                    "Protocol": "-1",
                    "RuleAction": "deny",
                    "RuleNumber": 12345,
                  },
                ],
              "IsDefault": true,
              "NetworkAclId": "acl-123aabb",
              "OwnerId": "112233445566",
              "Tags": null,
              "VpcId": "vpc-1234321",
            },
          ],
        "OwnerId": "112233445566",
        "RouteTables":
          [
            {
              "Associations":
                [
                  {
                    "Main": true,
                    "RouteTableAssociationId": "rtbassoc-1122aa33",
                    "RouteTableId": "rtb-1122abc33",
                    "SubnetId": null,
                  },
                ],
              "OwnerId": "112233445566",
              "PropagatingVgws": null,
              "RouteTableId": "rtb-11223344",
              "Routes":
                [
                  {
                    "DestinationCidrBlock": "0.0.0.0/0",
                    "DestinationIpv6CidrBlock": null,
                    "DestinationPrefixListId": null,
                    "EgressOnlyInternetGatewayId": null,
                    "GatewayId": "igw-abc123",
                    "InstanceId": null,
                    "InstanceOwnerId": null,
                    "NatGatewayId": null,
                    "NetworkInterfaceId": null,
                    "Origin": "CreateRoute",
                    "State": "active",
                    "TransitGatewayId": null,
                    "VpcPeeringConnectionId": null,
                  },
                ],
              "Tags": null,
              "VpcId": "vpc-11223344",
            },
          ],
        "SecurityGroups":
          [
            {
              "Description": "default VPC security group",
              "GroupId": "sg-abc123",
              "GroupName": "default",
              "IpPermissions":
                [
                  {
                    "FromPort": null,
                    "IpProtocol": "-1",
                    "IpRanges": null,
                    "Ipv6Ranges": null,
                    "PrefixListIds": null,
                    "ToPort": null,
                    "UserIdGroupPairs":
                      [
                        {
                          "Description": null,
                          "GroupId": "sg-abc123",
                          "GroupName": null,
                          "PeeringStatus": null,
                          "UserId": "1122334455",
                          "VpcId": null,
                          "VpcPeeringConnectionId": null,
                        },
                      ],
                  },
                ],
              "IpPermissionsEgress":
                [
                  {
                    "FromPort": null,
                    "IpProtocol": "-1",
                    "IpRanges":
                      [{ "CidrIp": "0.0.0.0/0", "Description": null }],
                    "Ipv6Ranges": null,
                    "PrefixListIds": null,
                    "ToPort": null,
                    "UserIdGroupPairs": null,
                  },
                ],
              "OwnerId": "112233445566",
              "Tags": null,
              "VpcId": "vpc-123454321",
            },
          ],
        "State": "available",
        "Tags": null,
        "VpcId": "vpc-1234321",
      }
  - Name: Flow Logs Enabled For Types ACCEPT, ALL
    ExpectedResult: true
    Resource:
      {
        "CidrBlock": "172.31.0.0/16",
        "CidrBlockAssociationSet":
          [
            {
              "AssociationId": "vpc-cidr-assoc-112233",
              "CidrBlock": "172.0.0.0/16",
              "CidrBlockState":
                { "State": "associated", "StatusMessage": null },
            },
          ],
        "DhcpOptionsId": "dopt-1122e3344",
        "FlowLogs":
          [
            {
              "CreationTime": "2019-07-09T17:42:04.677Z",
              "DeliverLogsErrorMessage": null,
              "DeliverLogsPermissionArn": null,
              "DeliverLogsStatus": "SUCCESS",
              "FlowLogId": "fl-09798935a87d0dbc6",
              "FlowLogStatus": "ACTIVE",
              "LogDestination": "arn:aws:s3:::panther-test-vpc-flow-logs",
              "LogDestinationType": "s3",
              "LogGroupName": null,
              "ResourceId": "vpc-094cd5323fa3206f6",
              "TrafficType": "ACCEPT",
            },
            {
              "CreationTime": "2019-07-09T17:42:04.677Z",
              "DeliverLogsErrorMessage": null,
              "DeliverLogsPermissionArn": null,
              "DeliverLogsStatus": "SUCCESS",
              "FlowLogId": "fl-09798935a87d0dbc6",
              "FlowLogStatus": "ACTIVE",
              "LogDestination": "arn:aws:s3:::panther-test-vpc-flow-logs",
              "LogDestinationType": "s3",
              "LogGroupName": null,
              "ResourceId": "vpc-094cd5323fa3206f6",
              "TrafficType": "ALL",
            },
          ],
        "InstanceTenancy": "default",
        "Ipv6CidrBlockAssociationSet": null,
        "IsDefault": true,
        "NetworkAcls":
          [
            {
              "Associations":
                [
                  {
                    "NetworkAclAssociationId": "aclassoc-1122abc444",
                    "NetworkAclId": "acl-123abc",
                    "SubnetId": "subnet-123abc",
                  },
                  {
                    "NetworkAclAssociationId": "aclassoc-123abc",
                    "NetworkAclId": "acl-1122abc",
                    "SubnetId": "subnet-112233aabb",
                  },
                ],
              "Entries":
                [
                  {
                    "CidrBlock": "0.0.0.0/0",
                    "Egress": false,
                    "IcmpTypeCode": null,
                    "Ipv6CidrBlock": null,
                    "PortRange": null,
                    "Protocol": "-1",
                    "RuleAction": "deny",
                    "RuleNumber": 12345,
                  },
                ],
              "IsDefault": true,
              "NetworkAclId": "acl-123aabb",
              "OwnerId": "112233445566",
              "Tags": null,
              "VpcId": "vpc-1234321",
            },
          ],
        "OwnerId": "112233445566",
        "RouteTables":
          [
            {
              "Associations":
                [
                  {
                    "Main": true,
                    "RouteTableAssociationId": "rtbassoc-1122aa33",
                    "RouteTableId": "rtb-1122abc33",
                    "SubnetId": null,
                  },
                ],
              "OwnerId": "112233445566",
              "PropagatingVgws": null,
              "RouteTableId": "rtb-11223344",
              "Routes":
                [
                  {
                    "DestinationCidrBlock": "0.0.0.0/0",
                    "DestinationIpv6CidrBlock": null,
                    "DestinationPrefixListId": null,
                    "EgressOnlyInternetGatewayId": null,
                    "GatewayId": "igw-abc123",
                    "InstanceId": null,
                    "InstanceOwnerId": null,
                    "NatGatewayId": null,
                    "NetworkInterfaceId": null,
                    "Origin": "CreateRoute",
                    "State": "active",
                    "TransitGatewayId": null,
                    "VpcPeeringConnectionId": null,
                  },
                ],
              "Tags": null,
              "VpcId": "vpc-11223344",
            },
          ],
        "SecurityGroups":
          [
            {
              "Description": "default VPC security group",
              "GroupId": "sg-abc123",
              "GroupName": "default",
              "IpPermissions":
                [
                  {
                    "FromPort": null,
                    "IpProtocol": "-1",
                    "IpRanges": null,
                    "Ipv6Ranges": null,
                    "PrefixListIds": null,
                    "ToPort": null,
                    "UserIdGroupPairs":
                      [
                        {
                          "Description": null,
                          "GroupId": "sg-abc123",
                          "GroupName": null,
                          "PeeringStatus": null,
                          "UserId": "1122334455",
                          "VpcId": null,
                          "VpcPeeringConnectionId": null,
                        },
                      ],
                  },
                ],
              "IpPermissionsEgress":
                [
                  {
                    "FromPort": null,
                    "IpProtocol": "-1",
                    "IpRanges":
                      [{ "CidrIp": "0.0.0.0/0", "Description": null }],
                    "Ipv6Ranges": null,
                    "PrefixListIds": null,
                    "ToPort": null,
                    "UserIdGroupPairs": null,
                  },
                ],
              "OwnerId": "112233445566",
              "Tags": null,
              "VpcId": "vpc-123454321",
            },
          ],
        "State": "available",
        "Tags": null,
        "VpcId": "vpc-1234321",
      }
  - Name: Flow Logs Inactive For Type ALL
    ExpectedResult: false
    Resource:
      {
        "CidrBlock": "172.31.0.0/16",
        "CidrBlockAssociationSet":
          [
            {
              "AssociationId": "vpc-cidr-assoc-112233",
              "CidrBlock": "172.0.0.0/16",
              "CidrBlockState":
                { "State": "associated", "StatusMessage": null },
            },
          ],
        "DhcpOptionsId": "dopt-1122e3344",
        "FlowLogs":
          [
            {
              "CreationTime": "2019-07-09T17:42:04.677Z",
              "DeliverLogsErrorMessage": null,
              "DeliverLogsPermissionArn": null,
              "DeliverLogsStatus": "SUCCESS",
              "FlowLogId": "fl-09798935a87d0dbc6",
              "FlowLogStatus": "INACTIVE",
              "LogDestination": "arn:aws:s3:::panther-test-vpc-flow-logs",
              "LogDestinationType": "s3",
              "LogGroupName": null,
              "ResourceId": "vpc-094cd5323fa3206f6",
              "TrafficType": "ACCEPT",
            },
          ],
        "InstanceTenancy": "default",
        "Ipv6CidrBlockAssociationSet": null,
        "IsDefault": true,
        "NetworkAcls":
          [
            {
              "Associations":
                [
                  {
                    "NetworkAclAssociationId": "aclassoc-1122abc444",
                    "NetworkAclId": "acl-123abc",
                    "SubnetId": "subnet-123abc",
                  },
                  {
                    "NetworkAclAssociationId": "aclassoc-123abc",
                    "NetworkAclId": "acl-1122abc",
                    "SubnetId": "subnet-112233aabb",
                  },
                ],
              "Entries":
                [
                  {
                    "CidrBlock": "0.0.0.0/0",
                    "Egress": false,
                    "IcmpTypeCode": null,
                    "Ipv6CidrBlock": null,
                    "PortRange": null,
                    "Protocol": "-1",
                    "RuleAction": "deny",
                    "RuleNumber": 12345,
                  },
                ],
              "IsDefault": true,
              "NetworkAclId": "acl-123aabb",
              "OwnerId": "112233445566",
              "Tags": null,
              "VpcId": "vpc-1234321",
            },
          ],
        "OwnerId": "112233445566",
        "RouteTables":
          [
            {
              "Associations":
                [
                  {
                    "Main": true,
                    "RouteTableAssociationId": "rtbassoc-1122aa33",
                    "RouteTableId": "rtb-1122abc33",
                    "SubnetId": null,
                  },
                ],
              "OwnerId": "112233445566",
              "PropagatingVgws": null,
              "RouteTableId": "rtb-11223344",
              "Routes":
                [
                  {
                    "DestinationCidrBlock": "0.0.0.0/0",
                    "DestinationIpv6CidrBlock": null,
                    "DestinationPrefixListId": null,
                    "EgressOnlyInternetGatewayId": null,
                    "GatewayId": "igw-abc123",
                    "InstanceId": null,
                    "InstanceOwnerId": null,
                    "NatGatewayId": null,
                    "NetworkInterfaceId": null,
                    "Origin": "CreateRoute",
                    "State": "active",
                    "TransitGatewayId": null,
                    "VpcPeeringConnectionId": null,
                  },
                ],
              "Tags": null,
              "VpcId": "vpc-11223344",
            },
          ],
        "SecurityGroups":
          [
            {
              "Description": "default VPC security group",
              "GroupId": "sg-abc123",
              "GroupName": "default",
              "IpPermissions":
                [
                  {
                    "FromPort": null,
                    "IpProtocol": "-1",
                    "IpRanges": null,
                    "Ipv6Ranges": null,
                    "PrefixListIds": null,
                    "ToPort": null,
                    "UserIdGroupPairs":
                      [
                        {
                          "Description": null,
                          "GroupId": "sg-abc123",
                          "GroupName": null,
                          "PeeringStatus": null,
                          "UserId": "1122334455",
                          "VpcId": null,
                          "VpcPeeringConnectionId": null,
                        },
                      ],
                  },
                ],
              "IpPermissionsEgress":
                [
                  {
                    "FromPort": null,
                    "IpProtocol": "-1",
                    "IpRanges":
                      [{ "CidrIp": "0.0.0.0/0", "Description": null }],
                    "Ipv6Ranges": null,
                    "PrefixListIds": null,
                    "ToPort": null,
                    "UserIdGroupPairs": null,
                  },
                ],
              "OwnerId": "112233445566",
              "Tags": null,
              "VpcId": "vpc-123454321",
            },
          ],
        "State": "available",
        "Tags": null,
        "VpcId": "vpc-1234321",
      }

Detection logic

Condition

not (FlowLogs is_not_null and FlowLogs array_any)

Exclusions

Top-level NOT(...) conjuncts: predicates this rule actively suppresses.

Field	Kind	Excluded values
`FlowLogs`	array_any	(no value, null check)
`FlowLogs`	is_not_null	(no value, null check)

`j` / `k`	Scroll down / up
`d` / `u`	Half-page down / up
`gg` / `G`	Top / bottom
`h` / `l`	History back / forward
`f`	Follow link (`Shift` = new tab)
`/`	Focus search
`?`	Toggle this help
`↑` / `↓`	Navigate search results
`Enter`	Open highlighted result
`Esc`	Close results / dialog

`type:`	`events` / `rules` / `providers`
`vendor:`	`sigma` / `elastic` / `splunk` / `kusto` / `chronicle` (vendor name alone also works: `sigma:`, `kql:`, `secops:`…)
`tactic:`	TA-id, slug, or name: `credential_access`, `TA0006`
`technique:`	technique or sub-technique ID: `T1003`, `T1003.001` (alias `tech:`)
`severity:`	`critical` / `high` / `medium` / `low` / `informational` (alias `sev:`)
`risk_score`	Numeric comparison on the Elastic risk score (0 to 100): `risk_score>50`, `risk_score<=20`, `risk_score=99` (alias `risk`; Elastic rules only)
`stages:`	Rules with exactly N pipeline stages
`correlation:`	`single_event` / `sequence` / `alternatives` / `alternatives_cross_log` / `all_required` / `correlated`
`with:`	Co-occurrence event-id; stacks (`with:4624 with:4769`) to require all, while a comma list in one occurrence (`with:4624,4769`) is an either-or group. Implies multi-event
`like:`	Structural neighbors of a rule slug (equivalents + subsumption stricter / broader): `like:comsvcs_lsass_memory_dump-splunk-sysmon`
`groupby:`	Entity-grouping substring match against `group_by_keys`: `groupby:user`, `groupby:host`
`uses:`	Rules whose predicate tree touches the field (any kind, any value): `uses:CommandLine`
`excludes:`	Rules with top-level `not()` clauses on the field (FP whitelists): `excludes:ParentImage`
`field:` / `value:`	Predicate search; narrows rule cards to those with a matching leaf and drives the indicator tier. Unquoted = substring, wildcards allowed (`value:mimikatz`)
`indicator:`	Shorthand for `field:F value:V`: `indicator:Image=*\powershell.exe`
`kind:`	Filter by predicate kind. Narrows rule cards to those carrying a matching predicate leaf (`vendor:elastic kind:cidr_match`) and drives the indicator tier: `contains` / `starts_with` / `ends_with` / `regex` / `cidr` / `eq` / `in` … (operator aliases `op:`/`match:`)
`has:` / `no:`	`sample`, `field`, `notes`, `refs`, `trace`, `thirdparty`, `rule`, `pattern`, `timewindow`, `threshold`, `newterms`, `sigma`/`elastic`/`splunk`/`kusto`/`chronicle`
`-op:val`	Exclude matches; works on most operators but not `type:`/`like:`/`has:`/`no:` (use `no:<flag>` to exclude a rule flag): `tactic:execution -vendor:splunk`. Standalone `-kind:`/`-field:`/`-value:` drop every rule carrying a matching predicate leaf (`type:rules -kind:is_null`)
`field:"…"` / `value:"…"`	Quoted value = anchored exact match (also allows spaces): `value:"net user"`
`a,b`	Comma = OR inside one operator (`vendor:sigma,elastic`, `severity:high,critical`); repeating a facet merges the same way. `field:`/`value:` never split (literal commas)
`vendors:` / `stage:`	Singular and plural spellings fold to the canonical operator and value: `tactics:` = `tactic:`, `type:event` = `type:events`, `correlation:sequences` = `correlation:sequence`, `has:thresholds` = `has:threshold`
`"quoted phrase"`	Exact-match a multi-word phrase (free text)

AWS VPC Flow Logs

MITRE ATT&CK coverage

Rule body yaml

Detection logic

Condition

Exclusions

Keyboard shortcuts

Search operators