title: Enumeration via the Global Catalog 
description: Detects enumeration of the global catalog (that can be performed using BloodHound or others AD reconnaissance tools). Adjust Threshold according to domain width.
status: experimental
author: Chakib Gzenayi (@Chak092), Hosni Mribah
id: 619b020f-0fd7-4f23-87db-3f51ef837a34
date: 2020/05/11
modified: 2021/06/01
references:
    - https://docs.microsoft.com/en-us/windows/security/threat-protection/auditing/event-5156
tags:
    - attack.discovery
    - attack.t1087.002
logsource:
    product: windows
    service: security
    definition: 'The advanced audit policy setting "Windows Filtering Platform > Filtering Platform Connection" must be configured for Success'
detection:
    selection:
        EventID: 5156
        DestinationPort:
        - 3268
        - 3269
    timeframe: 1h
    condition: selection | count() by SourceAddress > 2000
falsepositives:
    - Exclude known DCs.
level: medium
