Potential Active Directory Reconnaissance/Enumeration Via LDAP

title: Potential Active Directory Reconnaissance/Enumeration Via LDAP
id: 31d68132-4038-47c7-8f8e-635a39a7c174
status: test
description: Detects potential Active Directory enumeration via LDAP
references:
    - https://techcommunity.microsoft.com/t5/microsoft-defender-for-endpoint/hunting-for-reconnaissance-activities-using-ldap-search-filters/ba-p/824726
    - https://github.com/PowerShellMafia/PowerSploit/blob/d943001a7defb5e0d1657085a77a0e78609be58f/Recon/PowerView.ps1
    - https://github.com/BloodHoundAD/SharpHound3/blob/7d96b991b1887ff50349ce59c80980bc0d95c86a/SharpHound3/LdapBuilder.cs
    - https://medium.com/falconforce/falconfriday-detecting-active-directory-data-collection-0xff21-c22d1a57494c
    - https://github.com/fox-it/BloodHound.py/blob/d65eb614831cd30f26028ccb072f5e77ca287e0b/bloodhound/ad/domain.py#L427
    - https://ipurple.team/2024/07/15/sharphound-detection/
author: Adeem Mawani
date: 2021-06-22
modified: 2025-07-04
tags:
    - attack.discovery
    - attack.t1069.002
    - attack.t1087.002
    - attack.t1482
logsource:
    product: windows
    service: ldap
    definition: 'Requirements: Microsoft-Windows-LDAP-Client/Debug ETW logging'
detection:
    generic_search:
        EventID: 30
        SearchFilter|contains:
            - '(groupType:1.2.840.113556.1.4.803:=2147483648)'
            - '(groupType:1.2.840.113556.1.4.803:=2147483656)'
            - '(groupType:1.2.840.113556.1.4.803:=2147483652)'
            - '(groupType:1.2.840.113556.1.4.803:=2147483650)'
            - '(sAMAccountType=805306369)'
            - '(sAMAccountType=805306368)'
            - '(sAMAccountType=536870913)'
            - '(sAMAccountType=536870912)'
            - '(sAMAccountType=268435457)'
            - '(sAMAccountType=268435456)'
            - '(objectCategory=groupPolicyContainer)'
            - '(objectCategory=organizationalUnit)'
            # - '(objectCategory=Computer)' Prone to false positives
            - '(objectCategory=nTDSDSA)'
            - '(objectCategory=server)'
            - '(objectCategory=domain)'
            - '(objectCategory=person)'
            - '(objectCategory=group)'
            - '(objectCategory=user)'
            - '(objectClass=trustedDomain)'
            - '(objectClass=computer)'
            - '(objectClass=server)'
            - '(objectClass=group)'
            - '(objectClass=user)'
            - '(primaryGroupID=521)'
            - '(primaryGroupID=516)'
            - '(primaryGroupID=515)'
            - '(primaryGroupID=512)'
            - 'Domain Admins'
            - 'objectGUID=\*'
            - '(schemaIDGUID=\*)'
            - 'admincount=1'
    distinguished_name_enumeration:
        EventID: 30
        SearchFilter: '(objectclass=\*)'
        DistinguishedName|contains:
            - 'CN=Domain Admins'
            - 'CN=Enterprise Admins'
            - 'CN=Group Policy Creator Owners'
    suspicious_flag:
        EventID: 30
        SearchFilter|contains:
            - '(userAccountControl:1.2.840.113556.1.4.803:=4194304)'
            - '(userAccountControl:1.2.840.113556.1.4.803:=2097152)'
            - '!(userAccountControl:1.2.840.113556.1.4.803:=1048574)'
            - '(userAccountControl:1.2.840.113556.1.4.803:=524288)'
            - '(userAccountControl:1.2.840.113556.1.4.803:=65536)'
            - '(userAccountControl:1.2.840.113556.1.4.803:=8192)'
            - '(userAccountControl:1.2.840.113556.1.4.803:=544)'
            - '!(UserAccountControl:1.2.840.113556.1.4.803:=2)'
            - 'msDS-AllowedToActOnBehalfOfOtherIdentity'
            - 'msDS-AllowedToDelegateTo'
            - 'msDS-GroupManagedServiceAccount'
            - '(accountExpires=9223372036854775807)'
            - '(accountExpires=0)'
            - '(adminCount=1)'
            - 'ms-MCS-AdmPwd'
    narrow_down_filter:
        EventID: 30
        SearchFilter|contains:
            - '(domainSid=*)'
            - '(objectSid=*)'
    condition: (generic_search and not narrow_down_filter) or suspicious_flag or distinguished_name_enumeration
level: medium