File and Directory Permissions Modification

Adversaries may modify file or directory permissions to evade defenses.

Modifies Watchdog functionality

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

Unexpected DNS network traffic destination

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

Creates/modifies environment variables

Creating/modifying environment variables is a common persistence mechanism.

Enumerates running processes

Discovers information about currently running processes on the system

Modifies init.d

Adds/modifies system service, likely for persistence.

Modifies rc script

Adding/modifying system rc scripts is a common persistence mechanism.

Modifies systemd

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

Modifies Bash startup script