https://www.digikey.com/en/products/detail/te-connectivity-amp-connectors/6-5173277-6/2203215 down to the square holes
mating part: https://www.digikey.com/en/products/detail/te-connectivity-amp-connectors/5174684-6/2202989
there are also maybe idc cable versions? https://www.te.com/en/product-CAT-AM7-2250.datasheet.pdf
fwiw my (rigol) scope's logic probe attachment has a connector similar to this.
