Germán Fernández on Twitter: "FYI: #RaspberryRobin C2s (compromised QNAP servers) are giving a 502 error (Proxy Error) pointing to techcloud[.]tw domain 👀 Last sample I checked (LNK): https://t.co/BrsfCskN3d I also uploaded the active C2s to ThreatFox on April 14: https://t.co/vEpXT2NoPw /cc:… https://t.co/vjWc0A4WXZ" / Twitter