osquery-defense-kit/net/unexpected-talkers-linux.sql

SELECT s.family,
  protocol,
  s.local_port,
  s.remote_port,
  s.local_address,
  s.remote_address,
  p.name,
  p.path,
  p.cmdline AS child_cmd,
  p.cwd,
  s.pid,
  s.net_namespace,
  pp.path AS parent_path,
  p.parent AS parent_pid,
  pp.cmdline AS parent_cmd,
  hash.sha256,
  CONCAT(
    MIN(s.remote_port, 32768),
    ",",
    protocol,
    ",",
    MIN(p.uid, 500),
    ",",
    p.name
  ) AS exception_key
FROM process_open_sockets s
  LEFT JOIN processes p ON s.pid = p.pid
  LEFT JOIN processes pp ON p.parent = pp.pid
  LEFT JOIN hash ON p.path = hash.path
WHERE protocol > 0
  AND s.remote_port > 0
  AND s.remote_address NOT IN ("127.0.0.1", "::ffff:127.0.0.1", "::1")
  AND s.remote_address NOT LIKE "fe80:%"
  AND s.remote_address NOT LIKE "127.%"
  AND s.remote_address NOT LIKE "192.168.%"
  AND s.remote_address NOT LIKE "172.1%"
  AND s.remote_address NOT LIKE "172.2%"
  AND s.remote_address NOT LIKE "172.30.%"
  AND s.remote_address NOT LIKE "172.31.%"
  AND s.remote_address NOT LIKE "::ffff:172.%"
  AND s.remote_address NOT LIKE "10.%"
  AND s.remote_address NOT LIKE "::ffff:10.%"
  AND s.remote_address NOT LIKE "fc00:%"
  AND s.state != "LISTEN"
  -- DNS clients
  AND NOT (
    remote_port = 53
    AND protocol IN (6, 17)
    AND p.name IN (
      "1password",
      "apt",
      "apt-get",
      "Brackets",
      "chainctl",
      "chrome",
      "chronyd",
      "cloud_sql_proxy",
      "code",
      "containerd",
      "controlplane",
      "crc",
      "curl",
      "dig",
      "dnf",
      "electron",
      "firefox",
      ".firefox-wrappe",
      "flameshot",
      "gh",
      "git-remote-http",
      "gitsign",
      "gnome-software",
      "go",
      "grafana-server",
      "grype",
      "host",
      "htop",
      "istioctl",
      "jcef_helper",
      "k6",
      "k9s",
      "ko",
      "kolide-pipeline",
      "launcher",
      "NetworkManager",
      "ngrok",
      "nix",
      "node",
      "nscd",
      "obs",
      "obs-browser-page",
      "obs-ffmpeg-mux",
      "obsidian",
      "opera",
      "pacman",
      "ping",
      "podman",
      "prometheus",
      "rootlessport",
      "signal-desktop",
      "slack",
      "slirp4netns",
      "snapd",
      "snap-store",
      "Socket Process",
      "spotify",
      "ssh",
      "steam",
      "steamwebhelper",
      "syncthing",
      "systemd-resolve",
      "tailscaled",
      ".tailscaled-wra",
      "terraform",
      "terraform-provi",
      "tkn",
      "traceroute",
      "vcluster",
      "wget",
      "whois",
      "xmobar",
      "yay",
      "zoom"
    )
  )

  -- General exceptions
  AND NOT exception_key IN (
    "123,17,500,chronyd",
    "22,6,,",      -- shortlived SSH (git push)
    "123,17,,",
    "22,6,500,ssh",
    "22067,6,500,syncthing",
    "443,6,500,CrBrowserMain",
    "443,6,500,CrUtilityMain",
    "443,6,500,wineserver",
    "27024,6,500,steam",
    "3100,6,500,firefox",
    "3100,6,500,k6",
    "3307,6,500,cloud_sql_proxy",
    "4070,6,500,spotify",
    "443,17,500,chrome",
    "443,17,500,electron",
    "443,17,500,jcef_helper",
    "443,17,500,slack",
    "443,17,500,spotify",
    "443,6,0,.tailscaled-wra",
    "443,6,0,dnf",
    "443,6,0,dockerd",
    "443,6,500,influxd",
    "443,6,0,influxd",
    "443,6,0,launcher",
    "443,6,0,pacman",
    "443,6,0,snapd",
    "443,6,0,tailscaled",
    "443,6,500,java",
    "443,6,472,grafana-server",
    "443,6,500,.firefox-wrappe",
    "443,6,500,1password",
    "443,6,500,authentik-proxy",
    "443,6,500,WebKitNetworkPr",
    "443,6,500,Brackets",
    "443,6,500,celery",
    "443,6,500,chainctl",
    "443,6,500,chrome",
    "443,6,500,cloud_sql_proxy",
    "443,6,500,code",
    "443,6,500,containerd",
    "443,6,500,controlplane",
    "443,6,500,cosign",
    "443,6,500,crane",
    "443,6,500,gvfsd-http",
    "443,6,500,crc",
    "443,6,500,curl",
    "443,6,500,Discord",
    "443,6,500,electron",
    "443,6,500,firefox",
    "443,6,500,flameshot",
    "443,6,500,gh",
    "443,6,500,git-remote-http",
    "443,6,500,gitsign",
    "443,6,500,gnome-shell",
    "443,6,500,gnome-software",
    "443,6,500,go",
    "443,6,500,grafana-server",
    "443,6,500,grype",
    "443,6,500,gunicorn",
    "443,6,500,WebKitNetworkPr",
    "443,6,500,htop",
    "443,6,500,istioctl",
    "443,6,500,k6",
    "443,6,500,k9s",
    "443,6,500,ko",
    "443,6,500,kolide-pipeline",
    "80,6,500,spotify",
    "443,6,500,kubectl",
    "443,6,500,ngrok",
    "443,6,500,nix",
    "443,6,0,containerd",
    "443,6,500,node",
    "443,6,500,obs-browser-page",
    "443,6,500,obs-ffmpeg-mux",
    "443,6,500,obs",
    "443,6,500,obsidian",
    "443,6,500,podman",
    "443,6,500,jetbrains-toolb",
    "443,6,500,signal-desktop",
    "443,6,500,slack",
    "443,6,500,slirp4netns",
    "443,6,500,snap-store",
    "443,6,500,Socket Process",
    "443,6,500,spotify",
    "443,6,500,steamwebhelper",
    "443,6,0,dirmngr",
    "443,6,500,terraform-provi",
    "443,6,500,terraform",
    "443,6,500,tkn",
    "443,6,500,vcluster",
    "443,6,500,wget",
    "443,6,500,xmobar",
    "443,6,500,yay",
    "443,6,500,zoom",
    "5228,6,500,chrome",
    "6000,6,500,ssh",
    "80,6,0,.tailscaled-wra",
    "80,6,0,dnf",
    "80,6,0,NetworkManager",
    "80,6,0,pacman",
    "80,6,0,tailscaled",
    "80,6,500,.firefox-wrappe",
    "80,6,500,curl",
    "80,6,500,firefox",
    "80,6,500,steam",
    "80,6,500,steamwebhelper",
    "80,6,500,syncthing",
    "8006,6,500,chrome",
    "8801,17,500,zoom",
    "9090,6,500,firefox",
    "9090,6,500,k6",
    "9090,6,500,prometheus",
    "9090,6,500,rootlessport"
  )

    -- These programs would normally never make an outgoing connection, but thanks to Nix, it can happen.
  AND NOT (
    remote_address LIKE ("151.101.%")
    AND remote_port = 443
    AND protocol = 6
    AND (
      parent_path LIKE "%/bash"
      OR parent_path LIKE "%/zsh"
      OR p.path LIKE "/nix/store/%/bash"
    )
  )

  -- Other more complicated situations
  AND NOT (
    p.name = "rootlessport"
    AND remote_port > 1024
  )
  AND NOT (
    p.name = "syncthing"
    AND (
      remote_port IN (53, 80, 88, 110, 443, 587, 993, 3306, 7451)
      OR remote_port > 8000
    )
  )
  AND NOT (
    p.name IN (
      "chrome",
      "Google Chrome Helper",
      "Brave Browser Helper",
      "Chromium Helper",
      "Opera Helper"
    )
    AND remote_port IN (
      53,
      3100,
      443,
      80,
      8006,
      9000,
      5004,
      8009,
      8080,
      8888,
      8443,
      5228,
      32211,
      53,
      10001,
      3478,
      19305,
      19306,
      19307,
      19308,
      19309
    )
  )

  AND NOT (
    p.name IN ("thunderbird")
    AND remote_port IN (53, 143, 443, 587, 465, 585, 993)
  )
  AND NOT (
    p.name IN ("spotify", "Spotify Helper", "Spotify")
    AND remote_port IN (53, 443, 8009, 4070, 32211)
  )
  AND NOT (
    remote_port IN (443, 53)
    AND p.name LIKE "terraform-provider-%"
  )
  AND NOT (
    remote_port iN (443, 53)
    AND p.name LIKE "kubectl.%"
  )
  AND NOT (
    p.cmdline LIKE "%google-cloud-sdk/lib/gcloud.py%"
    AND remote_port IN (80, 53, 443)
  )
GROUP BY p.cmdline