Not sure, but there's a description of its behavior and methodology here. It seems to suggest that it will also populate system files and spread non-malicious files in various folder's as part of its payload, so the games could be collateral damage rather than the source. Typical vectors seem to be spam email attachments, social media links, and third party software. Its not impossible that some element of the games or their installation could have been a vector, one way to make sure may be to thoroughly purge the trojan and reinstall the games in question, then run another sweep to see if infection reoccured.