Guitar Wiring help

[cordura21]

hey guys. I have a strat that buzzes. When I connect both the bridge and the cable plug metal with my hand, the buzz dissappears.
Why does it do this? I guess it's a broken ground going to the bridge, but then when I release the guitar with my hand the noise is there.

So how can I ground it in a way that it doesn't buzz even when I am not touching it with my hand? I supposed that it used the amp ground to get rid of the noise.

Do you think that grounding to the bridge is enough?

Cheers, Andrés

[64Firebird]

What kind of guitar/pickups is it?

[cordura21]

it's a korean fender strat, with the stock pickups.