Rooting my device, i can root it from the ROM?

i have a Samsung S5660 that i have upgraded to Android 2.3.7 but none of the previous hack or utilities seems to work with this version of Gingerbread. I need it to be upgraded and rooted, i was thinking if it's possible to hack the ROM directly since i have a tar.md5 package with the ROM itself, because i have already tried everything, even something with adb shell directly into the phone but apparently nothing works. How to root my phone ?