WARNING: Suricata will not work properly with any Snort3 rules, so only use rules files designed for Snort 2.9.x versions with Suricata.
Sign up for a free snort account.
Under Services → Suricata → Global Settings
Tick “Install Snort rules”.
Against “Snort Rules Filename”, enter 2.9.x Snort release filename e.g. snortrules-snapshot-29120.tar.gz from https://www.snort.org/downloads.
Enter “Snort Oinkmaster Code”.