Creates/modifies Cron job

Cron allows running tasks on a schedule, and is commonly used for malware persistence.

Creates/modifies environment variables

Creating/modifying environment variables is a common persistence mechanism.

Modifies init.d

Adds/modifies system service, likely for persistence.

Modifies systemd

Adds/ modifies systemd service files. Likely to achieve persistence.

Modifies Bash startup script