[Query Issue]: Potential GPO 'Apply' misconfiguration (filtering out Admins does not work

[ig-masch]

Query GUID

f5f2455e-afdc-4708-9a34-98f539ce52d8

Query content

MATCH p=(n:Base)-[:GenericAll|GenericWrite]->(g:GPO)

// Exclude Enterprise Admins and Domain Admins
WHERE NOT n.objectid =~ "-(519|512)$"

// Exclude unresolved SIDs
AND NOT (n.distinguishedname IS NULL)

// Asset description may reveal if it's a delegation group (false-positive) or a filter group (true-positive)
//AND n.description is not null
//AND n.description =~ "(?i)apply"

RETURN p
LIMIT 1000

Issue description

Issue

The query does not correctly exclude admins. When I run

MATCH p=(n:Base)-[:GenericAll|GenericWrite]->(g:GPO)
WHERE NOT n.objectid =~ "-(519|512)$"
AND NOT (n.distinguishedname IS NULL)
RETURN n.objectid

I get (sorry for bad formatting, but you get the point
╒═══════════════════════════════════════════════╕
│n.objectid │
╞═══════════════════════════════════════════════╡
│"S-1-5-21-1936219977-138304643-1546849883-519" │
├───────────────────────────────────────────────┤
│"S-1-5-21-1936219977-138304643-1546849883-512" │
├───────────────────────────────────────────────┤
│"S-1-5-21-1936219977-138304643-1546849883-512" │
├───────────────────────────────────────────────┤
│"S-1-5-21-1936219977-138304643-1546849883-519" │
├───────────────────────────────────────────────┤
[....]

Remediation

Changing the query to

MATCH p = (n:Base)-[:GenericAll|GenericWrite]->(g:GPO)
WHERE 
    NOT n.objectid =~ ".*-(519|512)$"
    AND n.distinguishedname IS NOT NULL
RETURN n.objectid

(note the change in the NOT n.objectid =~ ".*-(519|512)$") fixed the issue for me.

Important notice

Thanks for your work! The community strives because of the hard work of amazing ppl like you do, we highly appreciate that!

BloodHound version

BloodHound v8.4.1

BloodHound DB

Neo4j