process where host.os.type == "linux" and event.type == "start" and event.action in ("exec", "exec_event", "start", "ProcessRollup2") and
process.parent.name in ("foomatic-rip", "cupsd") and process.command_line like (
  // persistence
  "*cron*", "*/etc/rc.local*", "*/dev/tcp/*", "*/etc/init.d*", "*/etc/update-motd.d*", "*/etc/sudoers*",
  "*/etc/profile*", "*autostart*", "*/etc/ssh*", "*/home/*/.ssh/*", "*/root/.ssh*", "*~/.ssh/*", "*udev*",
  "*/etc/shadow*", "*/etc/passwd*",

  // Downloads
  "*curl*", "*wget*",

  // encoding and decoding
  "*base64 *", "*base32 *", "*xxd *", "*openssl*",

  // reverse connections
  "*GS_ARGS=*", "*/dev/tcp*", "*/dev/udp/*", "*import*pty*spawn*", "*import*subprocess*call*", "*TCPSocket.new*",
  "*TCPSocket.open*", "*io.popen*", "*os.execute*", "*fsockopen*", "*disown*", "*nohup*",

  // SO loads
  "*openssl*-engine*.so*", "*cdll.LoadLibrary*.so*", "*ruby*-e**Fiddle.dlopen*.so*", "*Fiddle.dlopen*.so*",
  "*cdll.LoadLibrary*.so*",

  // misc. suspicious command lines
   "*/etc/ld.so*", "*/dev/shm/*", "*/var/tmp*", "*echo*", "*>>*", "*|*"
) and not process.args like "gs*"