Ryuk Malware, an email phishing scam, has reportedly enabled hackers to loot Bitcoins worth $3.7 million (705 bitcoins) in less than 6 months from large companies and government organizations.

As per reports, the malware spreads through email phishing campaigns which use a Trojan called TrickBot to attack specific targets. When the email is opened, the Trojan encrypts and locks the user hard drives until the user pays a ransom. The ransom demanded varies depending upon the size and value of the target.

Companies like Crowdstrike and McAfee have stated that GRIM SPIDER, the group of hackers behind Ryuk, seems to run the malware attack from Russia. It has been reported that until now 52 known transactions have been made to 37 BTC addresses, where the lowest ransom was for 1.7 BTC, while the highest is recorded to be 99 BTC.