Authorities want the money to go to surviving victims and families of the dead.
A federal judge ruled last week that the benefits are subject to seizure, although the forfeiture can still be disputed.
Farook's mother was named as beneficiary for $275,000 worth of policies purchased several years before the attack.
Federal prosecutors sued to seize the money on grounds that assets derived from terrorism are subject to forfeiture. Authorities want the money to go to surviving victims and families of the dead.