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You should select just Security Hub as the source. If you run an EventBridge for Security Hub and GuardDuty, you'll get duplicate findings for GuardDuty, because SecurityHub will be forwarding them, as well.
answered 2 years ago
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Thanks. however when I look at event in Security hub that came via GuardDuty it does not seem to carry a reference to security hub see the snippet below for a port scan alert in Security hub also when I select the source at SecurityHub in eventbridge the filter has options like Compliance status etc which is also not part of the message
{ "SchemaVersion": "2018-10-08", "Id": "arn:aws:guardduty:ap-southeast-2:1xxxxx303257:detector/a0c1245b45b6c971a0b4eece2539e70b/finding/c0c1580e6e98d8644b571751b6b96330", "ProductArn": "arn:aws:securityhub:ap-southeast-2::product/aws/guardduty", "ProductName": "GuardDuty", "CompanyName": "Amazon", "Region": "ap-southeast-s", "GeneratorId": "arn:aws:guardduty:ap-southeast-2:1xxxxxxxxx:detector/a0c1245b45b6c971a0b4eece2539e70b", "AwsAccountId": "1xxxxxx", "Types": [ "TTPs/Discovery/Recon:EC2-Portscan" ],
EDIT: I have updated the Event Pattern to following in EventBridge and it works to filter out only notices from GuardDuty
{ "source": ["aws.securityhub"], "detail-type": ["Security Hub Findings - Imported"], "detail": { "findings": { "ProductName": ["GuardDuty"] } } }