Most of the SolarWinds tools run on Windows only. Some of the obfuscation they use reminds me of how complicated PSD is to parse.
Finding that you've been infected with this malware should trigger a critical response. I wouldn't even feel safe until I've nuked all the servers and rolled as many credentials as I could. And even then who knows how much data the attacker could have already exfiltrated. Frankly this level of sophistication is terrifying because you really never know for sure how deep they managed to get in.