Update o365_excessive_os_vendors_authenticating_from_user.yml

Adding drilldowns

detections/cloud/o365_excessive_os_vendors_authenticating_from_user.yml

@@ -24,6 +24,19 @@ references:
 - https://www.blackhillsinfosec.com/exploiting-mfa-inconsistencies-on-microsoft-services/
 - https://sra.io/blog/msspray-wait-how-many-endpoints-dont-have-mfa/
 - https://github.com/dafthack/MFASweep/tree/master
+drilldown_searches:
+- name: View the detection results for - "$user$"
+  search: '%original_detection_search% | search user = "$user$"
+  earliest_offset: $info_min_time$
+  latest_offset: $info_max_time$
+- name: View risk events for the last 7 days for - "$user$"
+  search: '| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$user$") starthoursago=168  | stats count min(_time) as firstTime max(_time) as lastTime values(search_name) as "Search Name" values(risk_message) as "Risk Message" values(analyticstories) as "Analytic Stories" values(annotations._all) as "Annotations" values(annotations.mitre_attack.mitre_tactic) as "ATT&CK Tactics" by normalized_risk_object | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`'
+  earliest_offset: $info_min_time$
+  latest_offset: $info_max_time$
+- name: Investigate logons from $user$ 
+  search: '`o365_management_activity` Operation IN (UserLoginFailed,UserLoggedIn) $user|s$'
+  earliest_offset: $info_min_time$
+  latest_offset: $info_max_time$
 tags:
   analytic_story: 
   - Office 365 Account Takeover
@@ -59,4 +72,4 @@ tests:
   attack_data:
   - data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1110/azure_mfasweep_events/azure_mfasweep_events.log
     source: o365
-	sourcetype: o365:management:activity
+	sourcetype: o365:management:activity