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Steam game mod breached to push password-stealing malware (Downfall, Slay the Spire Mod)
(www.bleepingcomputer.com)
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Rules:
I love Steam and wouldn't lay the blame for this on them but this is why you need to use trusted software sources and isolate machines that use less trustable software.
Steam was not even involved. This didn't affect the Steam version.
The publisher got pwnd and the malware got pushed out over Steam. No different from someone publishing a malicious game directly.