Clothing and fitness data company Under Armour said it is investigating claims of a data breach after a cybercriminal posted millions of customer records to a hacker forum.The seller told TechCrunch that the data was taken in a November data breach, which the Everest ransomware gang claimed responsibility for in a post on its dark web leak site at the time.  News of the data theft became more widely known this week after breach notification site Have I Been Pwned obtained a copy of the stolen data, and not ...