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.^[1],[2]

References

1. ss64. (n.d.). trap. Retrieved May 21, 2019.
2. Cyberciti. (2016, March 29). Trap statement. Retrieved May 21, 2019.

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