Google is constantly working to improve our systems that protect users from Potentially Harmful Applications (PHAs). Usually, PHA authors attempt to install their harmful apps on as many devices as possible. However, a few PHA authors spend substantial effort, time, and money to create and install their harmful app on one or a very small number of devices. This is known as a targeted attack.
In this blog post, we describe Chrysaor, a newly discovered family of spyware that was used in a targeted attack on a small number of Android devices, and how investigations like this help Google protect Android users from a variety of threats.