LoFP / there is a potential for false positives if the \"which\" command is used for legitimate purposes, such as debugging or troubleshooting. it is important to investigate any alerts generated by this rule to determine if they are indicative of malicious activity or part of legitimate container activity.

process where host.os.type == "linux" and event.type == "start" and event.action == "exec" and (
  process.name == "which" or
  (
    /* Account for tools that execute utilities as a subprocess, in this case the target utility name will appear as a process arg */
    process.name in ("bash", "dash", "sh", "tcsh", "csh", "zsh", "ksh", "fish", "busybox") and
    process.args in ("which", "/bin/which", "/usr/bin/which", "/usr/local/bin/which") and
    /* default exclusion list to not FP on default multi-process commands */
    not process.args in (
      "man", "/bin/man", "/usr/bin/man", "/usr/local/bin/man",
      "chmod", "/bin/chmod", "/usr/bin/chmod", "/usr/local/bin/chmod",
      "chown", "/bin/chown", "/usr/bin/chown", "/usr/local/bin/chown"
    )
  )
) and
process.args in (

  /* TCP IP */
  "curl", "wget", "socat", "nc", "netcat", "ncat", "busybox", "python3", "python", "perl", "node", "openssl", "ruby", "lua",

  /* networking */
  "getent", "dig", "nslookup", "host", "ip", "tcpdump", "tshark",

  /* container management */
  "kubectl", "docker", "kubelet", "kube-proxy", "containerd", "systemd", "crictl",

  /* compilation */
  "gcc", "g++", "clang", "clang++", "cc", "c++", "c99", "c89", "cc1*", "musl-gcc", "musl-clang", "tcc", "zig", "ccache", "distcc", "make",

  /* scanning */
  "nmap", "zenmap", "nuclei", "netdiscover", "legion", "masscan", "zmap", "zgrab", "ngrep", "telnet", "mitmproxy", "zmap",
  "masscan", "zgrab"
) and
process.interactive == true and container.id like "*"