ETW using xperf (or WPA on Win8.x) is better suited for this task. The article ‘Hidden’ ETW Stack Trace Feature – Get Stacks All Over the Place! does exactly what you want.
In that article they are looking for callers of ws2_32!socket
so it'll be easy to follow their steps and look for callers of ws2_32!WSASend
and ws2_32!send
instead.