No one knows, not even the ghosts (???,???) -Chinese idiom It’s perhaps only a coincidence that there’s a famous Chinese saying that neatly summarizes a recent hack on MiMi, a Chinese messaging app. According to recent reports, a Chinese state-backed hacking group inserted malicious code into this messaging app, essentially pulling off the equivalent of the infamous SolarWinds hack. Users of MiMi were served a version of the app with malicious code added, thanks to attackers taking control of the servers that delivered the app. In short, this was a software supply chain attack in which the software delivery pipeline…