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How to avoid false positives withj alarm for CVE 2019-0708?

Hi,

 

3 weeks ago i posted a question about the alarm in subject. Now that i set all the correlation rules and alarms, seems work fine. Now i encountering another problem. I get a lot of false positive alarms. I am trying to tune the correlation rules but i cant find a way. I was thinking to increase the number of the events needed for the alarm to trigger, but it can be a no-function workaround. I want that the context is both R2L and L2L. Any suggestion?

The rule is: 7 events from the same source with the same destination towards the RDP port within 10 minutes.

I already set a filter for events subtype is "pass", but still get a lot of false positives.

 

Can anyone help me?

 

Thank you in advance

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