process where host.os.type == "linux" and event.type == "start" and
  event.action in ("exec", "exec_event", "start") and
  process.name == "which" and process.args_count >= 10 and not (
    process.parent.name == "jem" or
    process.parent.executable like ("/vz/root/*", "/var/lib/docker/*") or
    process.args == "--tty-only"
  )

/* potential tuning if rule would turn out to be noisy
and process.args in ("nmap", "nc", "ncat", "netcat", nc.traditional", "gcc", "g++", "socat") and
process.parent.name in ("bash", "dash", "ash", "sh", "tcsh", "csh", "zsh", "ksh", "fish")
*/