Yeah usually they go for the vines. This guy must have strayed off course. Squash Vine Borers are a pretty common problem for many squash growers. You have been quite fortunate if you haven't seen one before.
Lots of info available on line on controls and preventatives. I use row covers to preven t them and to avoid having to use strong pesticides. Once they bore inside the stem or fruit no pesticide can reach them anyway.
Dave
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