Transmission 2.90 contains malware OSX.KeRanger.A. Kill process “kernel_service” and update to TM 2.91 ASAP transmissionbt.com
Disable OSX Mail app auto loading (malicious) remote content in e-mails: “defaults write com.apple.mail-shared DisableURLLoading -bool true”
If kernel_service exists, delete its binary in “/Users/<usr>/Library/kernel_service“ OSX.KeRanger.A is ransomware. Ensure offline back-ups.