The message here is to regularly run an antivirus scan.
The Steam accounts of multiple game developers were recently compromised and used to update their games with malware. Fewer than 100 Steam users had the games installed when the malware was added, and they’ve been directly notified of the risk by email, according to Valve.
The company confirmed details of the intrusion to PC Gamer. The updates potentially containing malware were “reverted and purged” within hours, and Valve advised any player with the games in question installed to run a full system scan with some decent anti-virus software.