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//Detects when a user with a privileged Azure AD role has had their on premises Active Directory password changed by someone other than themselves.

//Data connector required for this query - Windows Security Events via AMA or Security Events via Legacy Agent
//Data connector required for this query - Microsoft Sentinel UEBA

let timeframe=7d;
//First find any users that hold privileged Azure AD roles
IdentityInfo
| where TimeGenerated > ago(21d)
| where isnotempty(AssignedRoles)
| where AssignedRoles != "[]"
| summarize arg_max(TimeGenerated, *) by AccountUPN
| project AccountUPN, AccountName, AccountSID
//Join those users based on AccountSID to on premises Active Directory password reset events
| join kind=inner (
    SecurityEvent
    | where TimeGenerated > ago(timeframe)
    | where EventID == "4724"
    | project
        TimeGenerated,
        Activity,
        SubjectAccount,
        TargetAccount,
        TargetSid,
        SubjectUserSid
    )
    on $left.AccountSID == $right.TargetSid
| where SubjectUserSid != TargetSid
//Summarize event data to make it easy to read
| project ['Time of Password Reset']=TimeGenerated, Activity, Actor=SubjectAccount, ['Target UserPrincipalName']=AccountUPN,['Target AccountName']=TargetAccount