ADCS detections

SecurityEvent
| where TimeGenerated >= ago(14d)
| where EventID == 4768
| project TimeGenerated, Computer, TargetAccount, EventData=parse_xml(EventData)
| mv-apply d=EventData.EventData.Data on 
(
    where d["@Name"]=="CertIssuerName"
    | project CIN=tostring(d["#text"])
)
| where not(isempty(CIN))
//In my prod, I'm seeing a lot of certs starting with a sid and containing live.com. Comment out the next line if you have that as well. 
//| where not(CIN startswith "S-1-")
//If you're seeing significant amount of machine accounts, might be due to 802.1X or SCCM. https://twitter.com/MagnusMOD/status/1407800853088591872?s=20. The following line allows you to filter out all endpoints. This does introduce a blindspot. + you need a custom function which provides data about (on-prem) ad machined. Alternatively, you can use DeviceInfo, if you're ingesting that data from MDE.
//| parse CIN with "CN=" MachineName
//| join kind=leftouter  MyCustomLookupFunction on $left.MachineName == $right.CN
//| where not(OperatingSystem startswith "Windows 10")