This icon is a part of a collection of Zapisz Archiwum flat icons produced by Icons8. Icons follow the guidelines of iOS, Windows, and Android and are designed by a single designer, guaranteeing the consistent quality. Both PNG and vector are available.
It's a logo of a rectangle in portrait orientation with a closed zipper coming down from the top of the rectangle to below the middle. On the lower right in front of the rectangle is a small square with its upper right section cut off with a horizontal line in its upper half and a fat dot in its lower half.