The Pentagon and Microsoft have moved against one of the world’s largest botnets in recent weeks.

The U.S. military and the Department of Homeland Security are actively tracking the effort, which sources say is linked to Beijing.

Despite the explosion of security firms that track state-linked hackers, a significant amount of that activity goes unnoticed.

It's the latest example of mobile malware aiming to sneak onto user devices.

Stalkerware detections have increased, some security researchers say, as the COVID-19 pandemic forces people to possibly quarantine with domestic abusers.

It's a cautionary tale in the use of social engineering for espionage.