Deletes itself

Modifies Watchdog functionality

Malware like Mirai modifies the Watchdog to prevent it restarting an infected system.

Creates/modifies Cron job

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

Enumerates active TCP sockets

Gets active TCP sockets from /proc virtual filesystem.

Enumerates running processes

Discovers information about currently running processes on the system

Modifies systemd

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

Reads MAC address of network interface

Fetches the MAC address of active network interfaces. May be used to detect known values for hypervisors.