https://www.cnet.com/news/hbo-social-media-accounts-hacked-by-ourmine/

"Hi, OurMine here, we are just testing your security, HBO team please contact us to upgrade the security," several messages posted read.

OurMine, which offers security assessments on social media, email and iCloud accounts (for a fee), has performed several high-profile attacks in the past, including Facebook founder Mark Zuckerberg, Google CEO Sundar Pichai, Netflix and the NFL.