Help wanted when launched a diagnose (SDU)

Hello,

as I'm receiving the message "Malicious connection detected: 'C2/Generic-B' at 'C:\program files (x86)\mozilla thunderbird\thunderbird.exe' (Technical Support reference: 1409585957)" in alerts and I want to ask for help, I launched a diagnose (SDU) from Sophos Central. After it 's finished I want to submit the zip file, but I'm not sure how or where I can enter this in the FileSubmission page. Or do I need to proceed differently?

Jo