I accidentally downloaded OpenOffice from the wrong website ([OpenOffice](https://OpenOffice.de) .de instead of the legit .org). After installing it I booted up my PC again (unrelated Win Update), and after booting Malwarebytes Premium quarantined the Malware PUP.Optional.StartPage.ShrtCln found under AppData/Roaming/OpenOffice Updater/Updater.exe. After that I got suspicious and made a full scan with Malwarebytes and it found 1 Registry Value and 1 Registry Key with the Malware PUP.Optional.OpenOfficeDE. They were quarantined and then deleted.
Then I searched for all files related to OpenOffice and deleted them + uninstalled the Program. I ran AdwCleaner 2x which found some unrelated Files, Preinstalled Software and Registries expect a PUP.Optional.Fake.OpenOfficeUpdater. It also deleted the IFEO keys and reset multiple policies and settings (eg. Winsock), I hope that was the right thing to do.
I can supply with further logs if needed.
My question is if I should look further for any rootkits, format this PC or work with FarbarRST (VirusTotal is showing me 2 Positives with the downloaded .exe?) since PUP.Optional.StartPage seems to be mainly a program that changes the start page of your browser (according to google).
Since I have a lot of important documents on this PC I am really worried about any keylogger, trojans etc..
I am grateful for any help (Y)