T1546.005: Trap

MITRE ATT&CK® Enterprise technique

Description

Adversaries may establish persistence by executing malicious content triggered by an interrupt signal. The <code>trap</code> 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 <code>ctrl+c</code> and <code>ctrl+d</code>.

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 <code>trap 'command list' signals</code> where "command list" will be executed when "signals" are received.(Citation: Trap Manual)(Citation: Cyberciti Trap Statements)

Detection

(no detection guidance published)

Data sources

• (none listed)

References

• ATT&CK page: https://attack.mitre.org/techniques/T1546/005
• ATT&CK Enterprise matrix: https://attack.mitre.org/matrices/enterprise/