LoFP / it's possible that a new user will start to modify ec2 instances when they haven't before for any number of reasons. verify with the user that is modifying instances that this is the intended behavior.

| tstats `security_content_summariesonly` count earliest(_time) as firstTime, latest(_time) as lastTime values(All_Changes.object_id) as object_id values(All_Changes.command) as command from datamodel=Change where All_Changes.action=modified All_Changes.change_type=EC2 All_Changes.status=success by All_Changes.user 
| `drop_dm_object_name("All_Changes")` 
| lookup previously_seen_cloud_instance_modifications_by_user user as user OUTPUTNEW firstTimeSeen, enough_data 
| eventstats max(enough_data) as enough_data 
| where enough_data=1 
| eval firstTimeSeenUser=min(firstTimeSeen) 
| where isnull(firstTimeSeenUser) OR firstTimeSeenUser > relative_time(now(), "-24h@h") 
| table firstTime user command object_id count 
| `security_content_ctime(firstTime)` 
| `cloud_instance_modified_by_previously_unseen_user_filter`

`cloudtrail` `ec2_modification_api_calls` [search `cloudtrail` `ec2_modification_api_calls` errorCode=success 
| stats earliest(_time) as firstTime latest(_time) as lastTime by userIdentity.arn 
| rename userIdentity.arn as arn 
| inputlookup append=t previously_seen_ec2_modifications_by_user 
| stats min(firstTime) as firstTime, max(lastTime) as lastTime by arn 
| outputlookup previously_seen_ec2_modifications_by_user 
| eval newUser=if(firstTime >= relative_time(now(), "-70m@m"), 1, 0) 
| where newUser=1 
| `security_content_ctime(firstTime)` 
| `security_content_ctime(lastTime)` 
| rename arn as userIdentity.arn 
| table userIdentity.arn] 
| spath output=dest responseElements.instancesSet.items{}.instanceId 
| spath output=user userIdentity.arn 
| table _time, user, dest 
| `ec2_instance_modified_with_previously_unseen_user_filter`