When someone says, “We checked the logs and found nothing suspicious,” my concern immediately goes up.
Not down.
In real incident response, clean logs are often the most suspicious outcome of all. They do not mean the system is safe. They usually mean the attacker was careful, early, or already gone.
Clean logs do not equal a clean system
Logs are not an objective record of truth. They are:
Generated by software that can be modified
Stored in locations attackers understand well
Often rotated or overwritten automatically
Frequently reviewed only after the fact
A skilled attacker does not leave obvious log entries. They leave normal-looking ones, or none at all.
“No suspicious logs” usually means one of three things:
