Obvious bollocks is obvious
"they have tools and computing power beyond that of the NSA"
Tools, I'm ready to kind of believe. After all, it did happen in the past a single individual proved to be better than whole organizations ...
But computing power ??? WTF ? They'd have to have billions in funding !
"We utilise our resources to reverse engineer the ransomware decryption key on your sample files."
This proves they don't understand cryptography. You technically don't reverse engineer it, as they info is nowhere in the code of the malware, unless the authors have been *really* stupid. You *discover* the key by whatever cryptanalysis method (brute force, good luck ! or anything else).
This is pure scam, only by wording ...