Catalysis of the transfer of a stearoyl (systematic name, octadecanoyl) group to a sulfur atom on the cysteine of a protein molecule, in the reaction: octadecanoyl-CoA + L-cysteinyl-[protein] = CoA + S-octadecanoyl-L-cysteinyl-[protein].
Source:PMID:22968831,
PMID:12681491,
PMID:22247542,
RHEA:59740