The Shadow Brokers hacker group, which released the Windows SMB (Server Message Block) software tool that was used in last week's massive global cyberattack, threatened on Wednesday that they plan to launch more bugs and dangerous tools to exploit computers in June.

However, unlike the security breach that resulted to the current cyberattack, the Shadow Brokers demanded "monthly dues" from hackers who are interested to use the new hacking tools, which are allegedly more devastating compared with those used in the ransomware attack that affected computers in 150 countries.

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"In the first stage, the group wanted to create trust among the hacker community and thus it released a small sample, which caused the global panic we saw last weekend," Roni Bachar, VP of cybersecurity firm Avnet, said.

The monthly subscription service will offer members confidential "compromised network data," ranging from ballistic missile and nuclear programs of countries like China, Iran, North Korea and Russia. The group's monthly data dump could also include hacking exploits for routers, web browsers, and operating systems like Windows 10.

Bachar also believes that the group has several other software tools that are equally or more powerful as the one used over the weekend.

"But I believe that the security companies, Microsoft and the others, will purchase the tools in order to research them and develop suitable protection," Bachar said.

 "TheShadowBrokers Data Dump of the Month" is a new monthly subscription model, with payments to be likely made via the cryptocurrency Bitcoin.

Meanwhile, the group also promised to include compromise financial data from the SWIFT international payment order system, which is used by banks to transmit trillions of dollars each day, and top secret information from many central banks, Daily Westerner reported.

The "WannaCry" ransomware launched last weekend made files inaccessible by encrypting them. The hackers asked for $300 in the Bitcoin currency to regain access. Some reports indicate that so far, the perpetrators have received nearly $50,000 so far.