This release includes 23 new rules and five modified rules, none of which are shared object rules. This release provides new coverage for the Rietspoof malware discovered earlier this year. No changes were made to the snort.conf rule set in this release. You can subscribe to Talos’ newest rule detection functionality for as low as $29 a year with a personal account. Make sure and stay up to date to catch the most emerging threats from emerging technologies with the latest release of Cisco Talos.”]
Source: https://blog.snort.org/2019/04/snort-rule-update-for-april-4-2019.html