The group is responsible for the release of the National Security Agency's (NSA) hacking exploits which highlighted a Windows vulnerability used by hackers in the recent WannaCry global ransomware attack.
It alleges the data could include "compromised network data from Russian, Chinese, Iranian, or North Korean nukes and missile programs", as well as exploits for Windows 10, handset exploits, and stolen data from central banks.
It also threatened to dump data from banks using the SWIFT worldwide money transfer network and from Russian, Chinese, Iranian or North Korean nuclear and missile programs, without providing further details.
The post explains Shadow Brokers main motivation in its activities as a competition of sorts, pitting itself against the NSA.
"Financial spying by the NSA is probably the most important and least liberty-infringing bulk-style program possible - and I doubt anyone outside the targeted countries would have a problem with the NSA spying on foreign WMD and missile programs", Weaver wrote. As is to be expected, the group notes that what members do with the exploits is completely up to them. These tools were dumped by the Shadow Brokers last month after a failed attempt to auction off the exploits.
It's unknown if the Shadow Brokers actually have more NSA-linked Equation Group exploits to start selling off every month to members in its latest attempt to get the NSA to pay up make money.
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The group had also previously put exploits up for sale on ZeroNet for up to 250 bitcoins a piece ($454,815 today) in January, Motherboard reported.
The WannaCry attack that took place over the weekend didn't involve any zero-day exploits - Microsoft had patched the SMB exploit used by EternalBlue in March, and the WannaCry ransomware was known to many antivirus vendors.
"TheShadowBrokers is launching new monthly subscription model", it explained.
From the letter, it looks like group tried auctioning these hacking tools, but they didn't really find buyers for the same.
The Shadow Brokers said it made a decision to share screenshots from the NSA Equation Group's lost 2013 Windows Ops Disk in January, with the understanding that the Equation Group would then tell Microsoft and the vulnerability would be patched.
The group went quiet for a while before resurfacing on 8 April with a new update which it said was in response to President Trump's order to bomb a Syrian airfield.
On the other hand, instead of telling them to Microsoft to patch up those vulnerabilities, it could bring forth a tumultuous situation as far as online security is concerned.