The U.S. Treasury said Friday it had imposed sanctions on four Iran- and Hong-Kong based companies for providing materials and technology to Iran’s ballistic missile and drone programs, and on a Hong Kong-based firm for selling Iranian commodities.

The Treasury also said it had imposed sanctions on six officials of Iran’s Islamic Revolutionary Guard Corp’s Cyber Electronic Command for malicious cyber activities against critical infrastructure in the United States and elsewhere.

As a result of the sanctions, all property of the designated entities and individuals that are in the United States or fall under U.S. control are blocked. As a general rule, U.S. individuals or companies are barred from transactions involving the property of those designated.