Newly Observed High Severity Suricata Alert

FROM logs-suricata.*

  // high severity alerts
| where event.module == "suricata" and event.kind == "signal" and event.severity == 1 and
        rule.name is not null and
        not rule.name like "SURICATA STREAM*"
| STATS Esql.alerts_count = count(*),
        Esql.first_time_seen = MIN(@timestamp),
        Esql.distinct_count_src_ip = COUNT_DISTINCT(source.ip),
        Esql.distinct_count_dst_ip = COUNT_DISTINCT(destination.ip),
        src_ip_values = VALUES(source.ip),
        dst_ip_values = VALUES(destination.ip),
        url_dom = VALUES(url.domain),
        url_path = VALUES(url.path) by rule.name, event.type
| eval Esql.recent = DATE_DIFF("minute", Esql.first_time_seen, now())
  // first time seen is within 10m of the rule execution time
| where Esql.recent <= 10 and
// exclude high volume alerts such as vuln-scanners
  Esql.alerts_count <= 5 and Esql.distinct_count_src_ip <= 2 and Esql.distinct_count_dst_ip <= 2

// move dynamic fields to ECS quivalent for rule exceptions
| eval source.ip = MV_FIRST(src_ip_values),
       destination.ip = MV_FIRST(dst_ip_values),
       url.domain = MV_FIRST(url_dom),
       url.path = MV_FIRST(url_path)
| keep rule.name, event.type, Esql.*, source.ip, destination.ip, url.domain, url.path