Winbox footprint/signature

Good Day all,
I have a problem with using of Winbox application installed in a workstation which is behind Fortinet firewall. Fortigate is using Application filtering in firewall and signature of Winbox is not in data base , so Winbox is categorised as unknown application and booked. All ports are opened in firewall.
I have possibility to add custom signature application in Fortigate firewall but for this in the script I need to add the Winbox footprint/signature/header.
Any can help with this? Really appreciate your support.
Happy New Year 2019 for all of you :smiling_face: