ZyXEL ZyWALL ATP700 User Guide - Page 573
Hash Value, Local Signature Databases, Cloud Query, Threat Intelligence Machine Learning
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Chapter 27 Anti-Malware Hash Value A hash function is an algorithm that maps data of arbitrary size to data of fixed size. The value returned by a hash function is a hash value. Hash values can be used to identify if the contents of a file have changed. At the time of writing, the MD5 (Message Digest 5) hash algorithm is supported. Local Signature Databases The Zyxel Device downloads the signature(s) after it is registered and the anti-malware license is activated at myZyxel. A signature is a unique string of bits, or binary pattern, of a malware. A signature acts as a fingerprint that can be used to detect and identify specific malware. The Zyxel Device downloads the following signatures: • Anti-malware signature • Threat Intelligence Machine Learning These signatures are periodically updated if you have a valid license. See Section 27.2 on page 577 for how the Zyxel Device updates these signatures for the anti-malware license. Cloud Query Another method of malware protection is through cloud query. This process is illustrated in the next figure. With Cloud Query, the Zyxel Device queries the Defend Center database by sending the file's hash value (A) and receiving the scan results (B) through the Defend Center (DC). Figure 386 Cloud Query Threat Intelligence Machine Learning Threat Intelligence Machine Learning is a master cloud database containing malware patterns learned from all Zyxel Devices. This allows Zyxel Devices to learn from each other in order to better defend against malware using patterns previously unknown to a single Zyxel Device. Anti-Malware Licensing Having extensive, up-to-date signatures with the most common malware is critical to making the antimalware service work effectively. Section 7.2 on page 201 shows licensing information for the different signature databases that can be used by the Zyxel Device. After the anti-malware license expires, you need to purchase an iCard to update your local signature database and use cloud query. Extend your license in the Registration > Service screen. ZyWALL ATP Series User's Guide 573
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