mmm.....1st: Why tha heck you want that sound? Is really awefull....
Anyway, i have tons of magz...so here is the main thing to achieve Kornīs nasty sound:
1- Get a 7th string guitar and detune it to A or B....depends on the song...
2-The most important thing: get a Mesa Boogie Rectifier kinda distorion unity (it can be a guitar amp simulator...)
3- The EQ should be plenty with LOWS and Treble, and GET RID OF THE MIDS!!! (..and i mean 0 gain on the mids.)
4-They use some Ibanez pedal efects for chorus and delays...you might check them out at
www.ibanez.com
Good Luck!