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ATT&CK Technique

Trap

T1546.005 · privilege-escalation, persistence

Adversaries may establish persistence by executing malicious content triggered by an interrupt signal. The trap command allows programs and shells to specify commands that will be executed upon receiving interrupt signals. A common situation is a script allowing for graceful termination and handling of common keyboard interrupts like ctrl+c and ctrl+d.

Adversaries can use this to register code to be executed when the shell encounters specific interrupts as a persistence mechanism. Trap commands are of the following format trap 'command list' signals where "command list" will be executed when "signals" are received.

macOSLinux
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Atomic Tests

4
Executable Atomic Red Team test cases for exercising this technique in a lab. Copy a command, run it on the listed platform, confirm your detections fire.
shmacos, linuxTrap EXIT
Launch bash shell with command arg to create TRAP on EXIT. The trap executes script that writes to /tmp/art-fish.txt 
bash -c 'trap "nohup sh $PathToAtomicsFolder/T1546.005/src/echo-art-fish.sh" EXIT'
shlinuxTrap EXIT (freebsd)
Launch bash shell with command arg to create TRAP on EXIT. The trap executes script that writes to /tmp/art-fish.txt 
bash -c 'trap "nohup sh $PathToAtomicsFolder/T1546.005/src/echo-art-fish.sh" EXIT'
shmacos, linuxTrap SIGINT
Launch bash shell with command arg to create TRAP on SIGINT (CTRL+C), then send SIGINT signal. The trap executes script that writes to /tmp/art-fish.txt 
bash -c 'trap "nohup sh $PathToAtomicsFolder/T1546.005/src/echo-art-fish.sh" SIGINT && kill -SIGINT $$'
shlinuxTrap SIGINT (freebsd)
Launch bash shell with command arg to create TRAP on SIGINT (CTRL+C), then send SIGINT signal. The trap executes script that writes to /tmp/art-fish.txt 
bash -c 'trap "nohup sh $PathToAtomicsFolder/T1546.005/src/echo-art-fish.sh" SIGINT && kill -SIGINT $$'
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Detection Coverage

0/6 layers
Coverage across standard detection surfaces. Rows marked none have no rule of that type mapped. Some are real blind spots worth closing; others are simply not applicable to this technique (e.g. YARA matches malware files, not network behaviour).
Behavioral / log (Sigma) none
Analytics (MITRE CAR) none
Runtime / container (Falco) none
File / malware (YARA) none
Network (Suricata/Snort) none
Vuln scan (Nuclei) none
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