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I'd like to detect udp port scan in Suricata.

I searched google, but I didn't manage to find Suricata rule for detecting UDP port scan attempts.
I saw before a snort rule for this scan.

How can we detect this kind of scan in Suricata?

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There's plenty of examples of UDP scans within the ET community signatures for Suricata.

One thing you have to keep in mind is that the very nature of a UDP scan. Someone is trying elicit a response through a socket on those ports via UDP. You may also want to consider creating flow rules related to the UDP protocol for saying # of connections with a null (or suspected common scanner payload) is seen sourcing from an offending host to multiple hosts in something like $HOME_NET and the flows bit words might be included from_client, stateless

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