XDR Detections -is EQL-WIN-EXE-PRC-DIAVOL-ARGS-1 broken

Yes that rule is broken.  It is failing to accurately perform the desired classification.

Currently rules with the experimental flag set rimental and are still being adjusted.  During EAP those rules are being shown and will be tuned and promoted prior to GA or will be removed from the console.  

SEE BELOW QUERY TO VIEW RULES THAT HAVE FIRED:

-- Rule execution counts

-- VARIABLE $$Category$$                STRING
-- VARIABLE $$Classification Rule$$     STRING
-- VARIABLE $$Experimental (1 = TRUE)$$ STRING -- SET to 1 to see only experimental rules
-- VARIABLE $$Mitre Tactic$$            STRING
-- VARIABLE $$Worker Process$$          STRING

SELECT
   COUNT(*) Instances,
   ioc_worker_name WorkerProcess,
   ioc_detection_category Category,
   ioc_detection_attack Detection_Type,
   ioc_detection_type Type,
   ioc_severity Risk,
   ioc_detection_id Classificattion_Rule,
   ioc_detection_sigma Sigma_Details,
   ioc_detection_eql EQL_Details,
   ioc_detection_mitre_attack ATTACK_Mapping,
   ioc_detection_experiment_level Experimental 
FROM xdr_ti_data
WHERE LOWER(ioc_detection_id) LIKE LOWER('%$$Classification Rule$$%')
   AND LOWER(ioc_detection_category) LIKE LOWER('%$$Category$$%')
   AND LOWER(ioc_worker_name) LIKE LOWER('%$$Worker Process$$%')
   AND LOWER(ioc_detection_mitre_attack) LIKE LOWER('%$$Mitre Tactic$$%')
   AND LOWER(CAST(ioc_detection_experiment_level AS VARCHAR) ) LIKE LOWER('%$$Experimental (1 = TRUE)$$%')
GROUP BY ioc_worker_name, ioc_detection_category, ioc_severity, ioc_detection_id, ioc_detection_sigma, ioc_detection_eql, 
   ioc_detection_attack, ioc_detection_mitre_attack, ioc_detection_type, ioc_detection_experiment_level
ORDER BY 1 DESC

Thanks for the question and sorry for the broken classification rule.

I also added a community post in the data lake forum that includes a query to show the detection logic used by a classificaiton rule.

https://community.sophos.com/intercept-x-endpoint/edr-data-lake-eap/f/discussions/130785/how-do-i-check-the-logic-for-a-classification-rule-if-i-suspect-it-is-a-false-positive

Thanks for the update, i wasnt aware that rules ending in -1 were experimental until now. Glad that I discounted the 1000+ Diavol ransomware detections previously as a false positive 

That's a great query, especially as I can use it to pivot off the results until this feature is available natively in Detections. Thanks for this.

After chatting with the MTR SOC Team, the -1 does not always indicate a rule is experimental.   You should check the flag in the table as shown in this query to list all Experimental rules that have fired.

-- Rule execution counts

-- VARIABLE $$Category$$                STRING
-- VARIABLE $$Classification Rule$$     STRING
-- VARIABLE $$Mitre Tactic$$            STRING
-- VARIABLE $$Worker Process$$          STRING
-- VARIABLE $$Experimental (1 = TRUE)$$ STRING

SELECT
   COUNT(*) Instances,
   ioc_worker_name WorkerProcess,
   ioc_detection_category Category,
   ioc_detection_attack Detection_Type,
   ioc_detection_type Type,
   ioc_severity Risk,
   ioc_detection_id Classificattion_Rule,
   ioc_detection_sigma Sigma_Details,
   ioc_detection_eql EQL_Details,
   ioc_detection_mitre_attack ATTACK_Mapping,
   ioc_detection_experiment_level Experimental 
FROM xdr_ti_data
WHERE LOWER(ioc_detection_id) LIKE LOWER('%$$Classification Rule$$%')
   AND LOWER(ioc_detection_category) LIKE LOWER('%$$Category$$%')
   AND LOWER(ioc_worker_name) LIKE LOWER('%$$Worker Process$$%')
   AND LOWER(ioc_detection_mitre_attack) LIKE LOWER('%$$Mitre Tactic$$%')
   AND LOWER(CAST(ioc_detection_experiment_level AS VARCHAR) ) LIKE LOWER('%$$Experimental (1 = TRUE)$$%')
GROUP BY ioc_worker_name, ioc_detection_category, ioc_severity, ioc_detection_id, ioc_detection_sigma, ioc_detection_eql, 
   ioc_detection_attack, ioc_detection_mitre_attack, ioc_detection_type, ioc_detection_experiment_level
ORDER BY 1 DESC