kqlHunting

List the top 10 accounts that have the most impersonators

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*.

Detection Query

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

Data Sources

CloudAppEvents

Platforms

azure-sentinelmicrosoft-defender

Tags

defender-for-cloud-apps

Raw Content

# 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
```KQL
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
```KQL
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
```