I honestly have no idea. There is no way to know 100%. Speculation would be just that, speculation. I believe it was through lucky7coin wallet, but I have no way to actually know that, that's just what was stated. If I had to make a bet though, I'd honestly bet it was someone outside of the company. That's just my opinion though.
Thank you for your views but it would be hard to believe that one wallet screwed everything up for everyone when cold storage was used... but thank you for your insight
The keyword is cold storage. Cold storage as in the server where the majority of the bitcoins were store WASN'T connected to the Internet, yet Mr. Genius Hacker had no problem whatsoever accessing the offline server, stealing the coins, and putting the server back offline.
After the hack was uncovered, Paul Vernon was contacted, whereupon he didn't even take time to change the underwear he wore the day before and headed down to the office, immediately contacting Mallick to see if he had any insight of the hack. It wasn't Mallick, so the next course of action was ...
Paul: Mallick, don't tell anybody about what happened.
Mallick: How are gonna cover the loses?
Paul: Business is good, so we'll simply take it out of future profits.
Mullick: DUDE, when the smoke clears, you'll gonna be looked upon as a God.
Paul: Buddha, but close enough.
Mullick: May the path to liberation be with us.
Paul: Heard that! Hold the fort down while I return home to change my underwear. Remember, mums the word.
Mullick: Got it! Hey, BitJohn, you ain't gonna believe what happened. Don't tell anybody unless it's Horus or Logan. A few hours ago ...