SURBL HASH BL by SecurityZONES is a comprehensive, hash-based threat intelligence feed and filtering solution designed to enhance protection against evolving cyber threats. It is a component of the SURBL multi-list and addresses challenges that traditional IP and domain blocklists may miss. The product contains hashed content associated with malicious activities, enabling the identification and blocking of threats based on email content, attachments, crypto-wallets, phone numbers, and URLs. It is particularly effective against threats hidden behind URL shorteners and redirectors, as well as those used in call-back phishing campaigns (also known as Hybrid Vishing or Telephone-Oriented Attack Delivery - TOAD). SURBL HASH BL can be integrated with existing email filtering systems and is compatible with SpamAssassin through a plug-in.