Crossrider
Crossrider is a software development kit (SDK) initially designed to enable developers to create browser extensions. Over time, it became associated with adware and potentially unwanted programs (PUPs). Crossrider has been used to inject advertisements into web browsers, often without user consent. As of October 2023, security researchers continue to monitor its activities due to its potential to compromise user privacy and system security.
Overview
Crossrider was originally developed as a legitimate tool for creating cross-browser extensions. However, it gained notoriety when it was repurposed by malicious actors to distribute adware. The adware version of Crossrider modifies browser settings and injects advertisements, which can lead to a degraded user experience and potential privacy risks. Security organizations have identified Crossrider as a threat due to its ability to collect user data and alter browser behavior without explicit permission.
History
Crossrider was launched in 2011 as a platform for developers to create browser extensions that work across different web browsers. Initially, it was a legitimate tool that facilitated the development of browser add-ons. However, its reputation changed when it became associated with adware distribution. Over the years, Crossrider has been used in various campaigns to deliver unwanted advertisements and collect user data. The shift from a legitimate SDK to a tool for distributing adware highlights the challenges in maintaining software integrity.
Technical characteristics
Crossrider operates by injecting code into web browsers, allowing it to modify web pages and display advertisements. It can alter browser settings, such as the default search engine and homepage, to redirect users to specific websites. The adware version of Crossrider is often bundled with free software, making it difficult for users to identify its presence. Once installed, it can collect browsing data, which may be used for targeted advertising. Crossrider's ability to operate across multiple browsers makes it a versatile tool for adware distribution.
Infection vector
Crossrider typically spreads through software bundling, where it is included with legitimate software downloads. Users may inadvertently install Crossrider when they download free software from the internet. The installation process often lacks clear disclosure, users to unknowingly consent to the installation of adware. Once installed, Crossrider can persist on the system and continue to inject advertisements into web browsers. This method of distribution highlights the importance of careful software installation practices.
Notable campaigns
Several campaigns have utilized Crossrider to distribute adware and potentially unwanted programs. These campaigns often target a wide range of users by bundling Crossrider with popular free software. The adware version of Crossrider has been observed redirecting users to specific websites to generate advertising revenue. Security organizations have documented instances where Crossrider was used to collect user data, which could be sold to third parties for marketing purposes. The widespread use of Crossrider in these campaigns underscores its impact on user privacy and system security.
Detection and mitigation
Detecting Crossrider can be challenging due to its ability to blend with legitimate software. Users may notice changes in browser behavior, such as unexpected advertisements or altered settings. Security software can help identify and remove Crossrider by scanning for known signatures and behaviors associated with adware. To mitigate the risk of Crossrider infection, users should exercise caution when downloading software from the internet. Reading installation prompts carefully and opting out of additional software can reduce the likelihood of inadvertently installing adware. Regularly updating security software and web browsers can also help protect against Crossrider and similar threats.