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MostImpersonatorsByAccount.md

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List the top 10 accounts that have the most impersonators

Query Information

Description

This query lists the top 10 accounts that have performed the most imporsonated users. The definiation for this field is: Indicates whether the activity was performed by one user for another (impersonated) user.

Defender XDR

CloudAppEvents
| where IsImpersonated == 1
| extend
     MailboxOwnerUPN = tostring(parse_json(RawEventData).MailboxOwnerUPN),
     ActionPerformedBy = tostring(parse_json(RawEventData).UserId)
| where MailboxOwnerUPN != ActionPerformedBy
| summarize Impersonators = make_set(ActionPerformedBy) by MailboxOwnerUPN
| extend TotalImpersonators = array_length(Impersonators)
| top 10 by TotalImpersonators

Sentinel

CloudAppEvents
| where IsImpersonated == 1
| extend
     MailboxOwnerUPN = tostring(parse_json(RawEventData).MailboxOwnerUPN),
     ActionPerformedBy = tostring(parse_json(RawEventData).UserId)
| where MailboxOwnerUPN != ActionPerformedBy
| summarize Impersonators = make_set(ActionPerformedBy) by MailboxOwnerUPN
| extend TotalImpersonators = array_length(Impersonators)
| top 10 by TotalImpersonators