Category:Penetration-testing/Active-Directory

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Enumeration

Using the credentials we obtained in a previous machine; sandra:Password1234!, we can attempt to enumerate Active Directory. We can achieve this using BloodHound. There is a python bloodhound injester, which can be found here. It can also be installed using pip: pip install bloodhound.

[email protected]:/data/tmp$ python3 -m pip install --user bloodhound
[email protected]:/data/tmp$ bloodhound-python \
    -d megacorp.local \
    -u sandra -p "Password1234!" \
    -gc pathfinder.megacorp.local \
    -c all -ns 10.10.10.30
INFO: Found AD domain: megacorp.local
INFO: Connecting to LDAP server: Pathfinder.MEGACORP.LOCAL
INFO: Found 1 domains
INFO: Found 1 domains in the forest
INFO: Found 1 computers
INFO: Connecting to LDAP server: Pathfinder.MEGACORP.LOCAL
INFO: Found 5 users
INFO: Connecting to GC LDAP server: pathfinder.megacorp.local
INFO: Found 51 groups
INFO: Found 0 trusts
INFO: Starting computer enumeration with 10 workers
INFO: Querying computer: Pathfinder.MEGACORP.LOCAL
INFO: Done in 00M 07S

The json files should now be in the working directory, ready to be imported into BloodHound.

[email protected]:/data/tmp$ ls -l *.json
-rw-r--r-- 1 unknown unknown  3222 Jun 13 18:27 computers.json
-rw-r--r-- 1 unknown unknown  3243 Jun 13 18:27 domains.json
-rw-r--r-- 1 unknown unknown 85362 Jun 13 18:27 groups.json
-rw-r--r-- 1 unknown unknown 12521 Jun 13 18:27 users.json

Installing and Starting BloodHound

For more details about BloodHound, refer to this tutorial.

First, we need to install neo4j and BloodHound.

[email protected]:/data/tmp$ sudo apt install neo4j bloodhound

Next, we need to configure the neo4j service. We can accomplish this by running the following command

[email protected]:/data/tmp$ sudo neo4j console

You will be then prompted to change your password. Next, we start BloodHound

[email protected]:/data/tmp$ bloodhound --no-sandbox

Ensure you have a connection to the database; indicated by a ✔️ symbol at the top of the three input fields. The default username is neo4j with the password previously set.

Opening BloodHound, we can drag and drop the .json files, and BloodHound will begin to analyze the data.

A better option is to zip all *.json files and drag the resulting zip to BloodHound to import all files in one shot.

[email protected]:/data/tmp$ zip megacorp.zip *.json
  adding: computers.json (deflated 74%)
  adding: domains.json (deflated 85%)
  adding: groups.json (deflated 95%)
  adding: users.json (deflated 91%)

We can select various queries, of which some very useful ones are Shortest Paths to High value Targets and Find Principles with DCSync Rights.

Shortest Paths from Domain Users to High Value Targets

HackTheBox-StartingPoint-PathFinder-bloodhound1.png

Find Principles with DCSync Rights

HackTheBox-StartingPoint-PathFinder-bloodhound2.png

While the latter query returns this:

We can see that the svc_bes has GetChangesAll privileges to the domain. This means that the account has the ability to request replication data from the domain controller, and gain sensitive information such as user hashes.