Static Features - Updates
Receiver on boot:
The app has a receiver with permission to register
Motivation: Adware tends to show advertisements just after using this receiver or it uses this receiver to keep alive service that handles showing such applications
Register Receiver When Screen Off:
The app dynamically registers receiver that reacts to turning off the screen
Motivation: A lot of adware uses such receivers to show adverts just after the user turns on the screen
Overrides OnBackPressed method without invoking original super method or finishing an activity:
Motivation: Adware/Lockers uses this to disable closing their app (advertisements) by clicking on the back button.
Runs Repeating Thread:
Detects standard way of setting up repeating tasks (threads) within the app
Motivation: This may be used to either keep a service alive or to repeatedly show advertisements to the user (ex. once per second) in order to effectively block any other action hoping the user will click on the ads.
Starts activity in a repeatedly run thread:
Detects if the repeating task (as detected by previous rule) is starting an activity
Motivation: There are quite a lot of reasons to start a repeating task, this rule tries to be less sensitive, so the result given by this rule may be more precise
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