question on awk

i have bench of files and i have archeive in different names

FOR EX:
the files come in the directory as

1111_2222_3333_4444_5555_6666_7777.dat.xls.ZIP
XXXX_VVVV_3333_4444_5555_6666_7777.dat.xls.ZIP

I have to select the files from 4 th position to last position and concaTENATE THEM .
can some one please tell me how to do this using awk

Please give an example of the output you need.