Prevent apoptosis of host cell by inhibiting caspase-3/CASP3 activation to promote the viral replication. Induces also the activation of host NF-kappaB. Interacts with subunit p17 of host CASP3. Probably accumulates in the perinuclear cytoplasmic viral factories. Found in association with viral nucleoid. Expressed in the late phase of the viral replicative cycle. Belongs to the asfivirus IAP family.