This one really doesn't require too much social engineering. The crooks somehow got their Trojan loaded into an update for the Transmission app for Torrent downloading and those who use that app for downloading stolen movies and pirated apps, who downloaded the 2.90 update, got the Trojan included with their update. There some irony in the fact that those who are willing to download pirated apps and steal movies and other copyrighted material are the ones who are going to be hit by this malware.
Like I didn’t say, stupid is as stupid does.
Wow, maybe that's what windows users do. I use it to download linux images, scientific research, engineering information, share information within distributed clusters with heterogenous OS (eg hadoop/osx/windows server), it totally rocks for strictly utilitarian purposes.We also use it to share information the powers-that-be want to suppress (eg climategate files, der spiegal's snowden data dumps, etc).
My peers and I must be some kind of weirdo pirates for shure.