"So it’s a case where the hackers break in on a non-important system, which is very common in hacking situations, and leveraged lateral movement to get onto sys

"So it’s a case where the hackers break in on a non-important system, which is very common in hacking situations, and leveraged lateral movement to get onto systems of interest over time." = "We're too lazy to make sure each level of security is protected from the last."