Japanese cryptocurrency exchange DMM Bitcoin announced on Friday (31st) afternoon that it detected an unauthorized leak of Bitcoin in its platform wallet. The amount of illegally leaked Bitcoin was 4502.9 BTC, worth about 48.2 billion yen (approximately 308 million US dollars).
In the announcement, DMM Bitcoin stated that it is still investigating the details of this loss and has taken measures to prevent unauthorized leaks. In order to ensure additional security, some trading and withdrawal functions on the platform will be restricted.
DMM Bitcoin also stated that all Bitcoin deposits of its customers will be fully guaranteed, “because we will obtain funds equivalent to the leaked BTC with the support of our group company”. DMM Bitcoin’s parent company is the Japanese e-commerce group DMM Group.
Data from blockchain security company Beosin shows that hackers have dispersed the stolen Bitcoin from DMM Bitcoin to 10 addresses, and its tracker will continue to monitor the flow of funds. The blockchain intelligence platform Arkham announced the establishment of a special bounty for this incident to identify the hackers.
Beosin believes that there may be two possible attack methods adopted by the hackers. The first one is a traditional exchange attack: DMM Bitcoin’s signature service is attacked or the multi-signature private key is leaked, and then the attacker receives funds using similar historical transfer addresses to avoid monitoring and attention. The other possible reason for being hacked is that the wallet controller of the exchange fell victim to address deception, that is, only the first 5 and last 2 letters of the receiving address are checked during the transfer, resulting in mistakenly transferring funds to the hacker’s address.
Source: Beosin Alert
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