It’s a fedora style hat with a band around it, and just below the hat there is a robber’s mask instead of a head or a face. There is a straight line that goes from the upper left to the lower right.
This is a Spyware icon. We've made it in iOS style
, first introduced in iOS version 7 and supported in all later releases up until now (at least iOS 11). This style is based on thin two-pixel lines and is optimized for 50x50 px. Unlike other vector icon packs that have merely hundreds of icons, this icon pack contains 13,100 icons, all in the same style and quality.