Update January 12th 2:06 PM:
Since the time of publication, additional testing has been done and the program has been found not to be malware. The false positives appear to be due to high amounts of obfuscation in the code, something that Malware does a lot, and that isn't neccesary for this type of program. The obsfucation is "going nuts with resource files" according to one person analyzing it.
So, if you've used EZ Optimizer you are fine, and if you are looking at using it, it is fine to use, even if it acts a bit weird in spots.
Original story below
Cyberpunk 2077 has had a tumultuous launch to say the least, with perhaps the biggest complaint centered around the poor performance. To fix this, EZ Optimizer supposedly offers a 30 FPS boost to players, but it does so at an apparent cost, as Hybrid Analysis--a website dedicated to scanning and recognizing malware--has deemed the program as malware.
That isn't to say the program doesn't work to some extent, but it definitely seems sketchy, with this Reddit thread stating that the tool merely edits in-game settings and other things that can be easily edited by the user with instructions. Apparently, the program writes data to a remote process, reads the active computer and reads cryptographic machine GUID, and contacts 9 domains and 10 hosts. Pretty sketchy indeed.
Of course, that doesn't mean that it is spyware/malware/malicious, but it does mean that you probably shouldn't use the program. There's an open-source version that does essentially the same thing called CyberEngineTweaks, you should probably use the open-source program instead, that also lacks the obfuscation of files that EZ Optimizer does.
Even then, there are some plot twists in this whole strange saga, as Yuri Bubliy, the developer who created the DRAM Calculator for Ryzen and ClockTurner for Ryzen, has advocated for the program:
Let me introduce you EZ Optimizer for Cyberpunk 2077 by CodeZ1LLa!— Yuri Bubliy (@1usmus) December 26, 2020
Boosts the performance up to 30 FPS, allowing you to play the game even on a low-end PC with a decent graphics quality!
Watch the guide and download it here: https://t.co/lirmuqE32S#Cyberpunk2077 @CyberpunkGame
So what does this all mean in the end? We're not quite sure. It's pretty interesting, though, and if you are trying to squeeze every last bit of performance out of Cyberpunk 2077 you should either use the open-sourced program, wait until the game is patched up a little bit more, or just grit your teeth and play through it.