OurMine took control of Hanke's account and posted a series of tweets, including one that identified Hanke's password as "nopass", TechCrunch reported.
The hackers posted the #OurMine hashtag within tweets on Hanke's account.
In July, the hacking team hit Pokemon Go's login servers with a distributed denial of service (DDoS) attack leaving some players frustrated as they were unable to log in to the game.
The group said it would not stop the attack until representatives from Pokemon Go contacted them.
"No one will be able to play this game till Pokemon Go contact us on our website to teach them how to protect it!" the group wrote in a post on its website.
A DDoS attack works by flooding a server with traffic so that it cannot be accessed by legitimate users.
OurMine has also claimed credit for compromising Twitter chief executive officer (CEO) Jack Dorsey's, Facebook chief Mark Zuckerberg's and Google CEO Sundar Pichai's social media accounts.
The group also hacked the Twitter account of Evan Williams, the microblogging site's co-founder and former CEO.
For the latest tech news and reviews, follow Gadgets 360 on X, Facebook, WhatsApp, Threads and Google News. For the latest videos on gadgets and tech, subscribe to our YouTube channel. If you want to know everything about top influencers, follow our in-house Who'sThat360 on Instagram and YouTube.