Identifier / Programs / Linux and Unix

chrt

Manipulate the real-time attributes of a process. tldr-pages

GTFOBins shell 1 ATT&CK technique 1 documented command

How chrt is abused

documented by GTFOBins

shell T1059.004 Command and Scripting Interpreter: Unix Shell

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

1 documented command

from GTFOBins, each read by the identifier

shell unprivileged, with sudo, as SUID

Any number between 1 and 99 will do.

chrt 1 /bin/sh

Identify

As SUID:

chrt 1 /bin/sh -p

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 chrt. The identifier reads the line that runs chrt.

What detects it

Sigma process creation rules

T1059.004Command and Scripting Interpreter: Unix Shell

Everyday use

from tldr-pages, CC BY 4.0

Display attributes of a process

chrt --pid process_idIdentify

Display attributes of all threads of a process

chrt --all-tasks --pid process_idIdentify

Display the min/max priority values that can be used with chrt

chrt --maxIdentify

None of the 3 examples the identifier reads matches GTFOBins abuse or trips a Sigma process-creation rule.

Options

8 in toybox

Show every option of chrt

-pSet/query given pid (instead of running COMMAND)

-RSet SCHED_RESET_ON_FORK

-mShow min/max priorities available

-oSCHED_OTHER

-fSCHED_FIFO

-rSCHED_RR

-bSCHED_BATCH

-iSCHED_IDLE