Get-Changes

Configuring

Prerequisite

WriteDacl

Configuring

Nothing need to be configured to abuse this since we set the ACL's of the object during the attack in the "WriteDacl" section.

Attacking

How it works

With the privileges DS-Replication-Get-Changes and DS-Replication-Get-Changes-All rights it is possible to execute the DCSync attack. Which will sync all(or a specifichash) of the users.

Tools

• MimiKatz

Executing the attack

1. Login to DATA01 with the username bank\secure_admin and the password rFKbUJrDu$sz*36ffKr6.

2. In the page DACL-Abuses I showed you how to check for ACL's using BloodHound. In this attack we will abuse the ACL secure_admin has on the domain object:

3. Open PowerShell as an Administrator and download an amsi and MimiKatz into memory.

4. Execute the DCSync attack with MimiKatz and retrieve the Administrator hash with the following command:

Invoke-Mimikatz -Command '"lsadump::dcsync /domain:secure.local /user:Administrator"'

Cleanup

1. Login to DC03 as Administrator with the password Welcome01!.

2. Open "Active Directory Users and Computers" and open the "Computers" section and open the "Properties" for the domainobject secure.local. Make sure the "Advanced Features" are enabled.

3. Open the "Security" tab and select the secure_admin user. Then click "Remove"

4. Then click "Apply" and "OK".

Defending

Recommendations

Detection

References

https://bloodhound.readthedocs.io/en/latest/data-analysis/edges.html#id34bloodhound.readthedocs.io