process where host.os.type == "linux" and event.type == "start" and event.action == "exec" 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*", "*>>*", "*|*"
)
Install detection rules in Elastic Security
Detect Suspicious Execution from Foomatic-rip or Cupsd Parent in the Elastic Security detection engine by installing this rule into your Elastic Stack.
To setup this rule, check out the installation guide for Prebuilt Security Detection Rules(opens in a new tab or window).