A financially motivated hacking group named Magnet Goblin uses various 1-day vulnerabilities to breach public-facing servers and deploy custom malware on Windows and Linux systems.
1-day flaws refer to publicly disclosed vulnerabilities for which a patch has been released.
Just fyi, I think this doesn't make them (0+1)-day exploits since 0-days are exploits that haven't even been disclosed yet but are discovered by someone being on the receiving end. Kind of catchy but bad name in that case imo. But maybe I shouldn't say anything since I don't have a better name.