Perhaps you mean SS-N-12 (Sandbox), or SS-N-19 (Shipwreck)?
1-ton warhead, ~300 nmi range, 1.5-2 Mach sea-skimmers.
The -19 has titanium armor applied, and one missile acts as spotter commander for up to 8 other missiles attacking the enemy. The acting-commanding missile is replaced by other one if destroyed. The 'slave' missiles lit up their radars only after directed towards their targets.
Russian subs can fire up 24 such missiles, each weighting more than Grippen fighter.