Cryptocurrency mining marketplace NiceHash had its payment system compromised, losing approximately 4,700 BTC from its Bitcoin hot wallet.
NiceHash's internal systems were breached by an attacker who gained access to the company's payment system and drained the Bitcoin hot wallet. The attack involved compromising an employee's computer, which was then used to access NiceHash's systems. The service was suspended for 24 hours post-breach as the company assessed damage.
The 4,700 BTC were moved across multiple Bitcoin addresses immediately after theft. Funds were dispersed through OTC desks and early mixing services. NiceHash reimbursed all affected miners from company funds over the following year. The attacker's identity was never publicly confirmed.