SharpHound host enumeration over Kerberos

title: SharpHound host enumeration over Kerberos
name: sharphound_enumeration_kerberos
description: Detect if a source host is requesting multiple Kerberos Service tickets (TGS) for different assets in a short period of time.
references:
  - https://docs.microsoft.com/en-us/windows/security/threat-protection/auditing/event-4769
  - https://github.com/mdecrevoisier/EVTX-to-MITRE-Attack/tree/master/TA0007-Discovery/T1087-Account%20discovery
  - https://www.splunk.com/en_us/blog/security/sharing-is-not-caring-hunting-for-file-share-discovery.html
tags:
  - attack.discovery
  - attack.t1069.002
  - attack.t1087.002
author: mdecrevoisier
status: experimental
logsource:
  product: windows
  service: security
detection:
  selection:
    EventID: 4769
    ServiceName|endswith: "$"
    Status: 0x0
  filter:
    - IpAddress:
        - "::1"
        - "%domain_controllers_ip%"
    - TargetUserName|contains: "$@" # excludes computer accounts
  condition: selection and not filter
falsepositives:
  - Administrator activity, backup software
level: medium

---
title: SharpHound host enumeration over Kerberos Count
status: experimental
correlation:
  type: value_count
  rules:
    - sharphound_enumeration_kerberos
  group-by:
    - ServiceName
  timespan: 5m
  condition:
    gte: 20
    field: IpAddress
level: high