Later, one of the miners with 4 thousand of devices in possession informed of an unknown virus which had transferred about 8 thousand dollars of bitcoins mined during that day to a third-party address, until the address substitution had been revealed. After activating the firmware, the Trojan virus blackmailer hAnt demanded a ransom of 10 BTC by threatening to overheat the device with its further disruption. In early 2019, a spread of malicious firmware was detected, which offered to Antminer S9 an overclocking potential of 18 Th/s. However, it affected not only PCs and its hardware (video cards, processors), but specialized mining devices e.g. In 2018, the growth of hidden mining malware reached 4467% compared with the previous year.
But in case of a wallet or blockchain it is rather difficult to “hack” it, turns out things are much easier with using victim’s equipment as a remote miner. The hype of cryptocurrencies could not help but attract hackers. Some hackers manage to earn more than 1 BTC per day only due to the viruses in other people's devices. Hackers infect user’s devices with malware which is programmed to transfer the reward to their workers, bypassing the addresses of the owners. Since the beginning of 2019, ASIC owners complain about stolen hash capacities.
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