Capcom first noticed an issue on the 2nd November. It's not clear what exactly happened, but it's most likely an individual or group calling themselves Ragnar Locker has managed to access Capcom's internal network and has taken files with personal and business information and then encrypted them which is the norm for ransomware. The company has been very open about what has happened, with a press release listing exactly what kind of information got stolen, and how much of it.
So far it looks like Japanese and American customer information has been taken, nothing from any other region. Most alarming is that they managed to obtain information about employees and shareholders and development documents. Some game information has also been leaked as the result of the attack, including information about a Resident Evil Battle Royale game (of course there was gonna be one!) and the release date of Resident Evil Village (April 2021). Around 1TB of data was taken overall.
No card details or anything of that nature was stolen in the attack.
You can read the press release here: http://www.capcom.co.jp/ir/english/news/html/e201116.html
Also, a BBC News Article here: https://www.bbc.co.uk/news/technology-54958782
And.. info on the Ragnar Locker ransomware here: https://resources.infosecinstitute....orks-and-how-to-prevent-it-malware-spotlight/