Hello.What were the biggest hacks of exchanges and how much money was stolen? I remember a big case with MT.GOX, but has something equally big happened since then?
I will list here some such hacking attacks
The founder of Poloniex, Tristan D'Agosta, did not have much business experience before he started. He was an independent writer and musician. The exchange had - as it turned out - some gaps in the code and payment system. As a result, it lost 65 thousand USD in cryptovalots.
Cryptsy lost USD 9.5 million. The attack took place in 2014, but more details appeared only two years later, when the exchange revealed that it was insolvent.
Cryptsy was finally closed in 2016. At that time, its former clients filed a class action suit. In July 2017, County Judge Kenneth Marra issued a verdict ordering the return of funds to users.
This time we are talking about a loss of USD 1.65 million.
The Chinese exchange BTERA has lost more than one million dollars in altcoin NXT. BTER was thinking for a while about recovering the stolen funds by reversing the NXT transaction, but exchange eventually decided not to pursue this idea.
This time we are talking about a "small" loss, only $690,000.
The Chinese stock exchange KipCoin claimed to have been attacked by hackers. Sceptics suggested that from the beginning it was a platform that operated as a financial pyramid. Unfortunately, the case was not clarified. The exchange disappeared from the network.
A hacker who stole more than $1.8 million worth of cryptoes from BitPay used a cunning phishing attack. He deceived Bryan Krohn, BitPay's CFO. He persuaded him by trickery to change his email password. Once the hacker had access to Krohn's email, he sent a series of requests to BitPay president Stephen Pairo. Shockingly enough, he thoughtlessly sent a BTC hacker worth nearly 2 million. USD.
Bitstamp's hack from 2015 resembles the 2014 BitPay attack. In both cases, hackers gained access to confidential credentials. However, the Bitstamp attack was slightly more sophisticated. The hackers used Skype and e-mail to convince the stock exchange employees to download malware. In this way they stole $5.2 million.