Being successful at compromising one or several workstations and/or servers from a targeted company is an important step for APT attackers. Just after the initial compromise step, there are 2 possible situations:
- The attacker managed to gain high privileges on the system.
- The attacker only managed to compromise machines with regular user privileges.
More often than one would think of, normal user rights can be enough for an APT attacker. This is the case when the attacker has aimed for a particular machine/user which he knows to store the information he wants, or an access to it. The most common situation here is when the attacker has been pushing his reconnaissance phase far enough to know exactly which user is working on a project he wants to steal. He can either aim for the users e-mail box, or decide to go for a compromise of the user's computer.
However, it is more common for APT attackers to want to get a lot more information. Therefore, they aim at compromising the whole information system, and the best way to do that is to elevate their privileges and go for an Active Directory complete dump.
So how does the attacker do, not to be stuck in one workstation with usual user rights ? Well, he does just the same as a penetration tester would do at this step, and this is what this blog post is about.