Modifies Watchdog functionality

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

Renames itself

Unexpected DNS network traffic destination

Network traffic to other servers than the configured DNS servers was detected on the DNS port.

Creates/modifies Cron job

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

Reads process memory

Read the memory of a process through the /proc virtual filesystem. This can be used to steal credentials.