That would be my guess as well - an application of so-called "Fourth-generation warfare". In the same way that ISIS seeks to encourage self-radicalization, since it is virtually untraceable, Russia (or really, anyone opposed to US interests) would aim to create a climate where NSA/CIA employees "self-radicalize" in the sense that they become convinced that those organizations are engaging in illegal or immoral activities.
So, create organizations like Wikileaks, people like Ed Snowden, plant news stories, etc. At a high level the idea is that you create a broad-spectrum propaganda campaign that is designed to encourage insiders to leak secrets for the benefit of their own conscience. If you reach the right people you can gain access to tons of secrets in a way that is 100% deniable. No payments, no meetings or communications with Russian agents that can be tracked, etc.