Nearly 37 million users of Ashley Madison have been impacted, the company that owns the adultery website is offering a $500,000 reward to arrest the hackers. Ashley Madison workers first discovered the hack on July 12 when they logged into their computers and received a message from hackers. The hackers had access to our VPN. The automation network and Siemens hardware were attacked and shut down. The attack appeared really singular because it forced computers to play AC/DCs Thunderstruck at full volume in the middle of the night.”]
Source: http://securityaffairs.co/wordpress/39567/cyber-crime/ashley-madison-500k-reward.html