This adware is a web browser extension that will inject advertising in the browser in the form of unwanted banners and text-links which may link to malware sites and install unwanted software. The application 1_offer_4.exe by Krance Development has been detected as adware by 1 anti-malware scanner with very strong indications that the file is a potential threat. The program is a setup application that uses the Nullsoft Install System installer. It is also typically executed from the user's temporary directory. The file has been seen being downloaded from savepass.downserver4.com. It is part of the Brightcircle group of web-extensions that inject advertisements in the browser.