A sophisticated phishing operation has emerged targeting Counter-Strike 2 players by exploiting an advanced technique called Browser-in-the-Browser (BitB). This method creates a convincing fake pop-up window that tricks users into entering their Steam credentials. By doing so, cybercriminals can steal gaming accounts and virtual items. The campaign mainly targets fans of the professional esports team Navi, offering fake rewards like free in-game items, skins, and cases. The attackers have registered multiple phishing domains that resemble the team’s name, such as “caseneos[.]cfd” and “caserevs[.]com,” using them to promote the scam on social media and YouTube.
Silent Push researchers first identified this attack in March 2025, linking it to Chinese threat actors.
Some phishing sites display content in Mandarin alongside English, indicating the origin of the campaign. The operation appears to be large-scale, with hundreds of similar domains using identical templates, further suggesting a coordinated effort to target gamers. These sites continue to advertise free Counter-Strike 2 skins in exchange for sensitive login information, exploiting the trust of avid gamers within the esports community.
The Browser-in-the-Browser technique used in this attack is a particularly deceptive form of phishing.
Unlike traditional phishing methods that simply replicate website designs, BitB creates a fake browser window within the real browser. This window mimics essential browser elements, such as the address bar, the security padlock icon, and window controls, making it even harder to detect. When victims click on what appears to be a legitimate Steam login button, they are presented with this fake browser window that closely resembles the official Steam login page, making it challenging for users to realize the fraud.
Silent Push’s technical analysis of the BitB implementation reveals how sophisticated the attack is. The fake browser window is created using HTML and CSS, making it appear like actual browser features. Researchers also noted that the fake address bar cannot be edited, further mimicking the browser’s real UI. The attackers use domain rotation tactics, regularly registering new phishing domains to evade detection. To avoid falling victim to this type of phishing, gamers are advised to verify URLs, check for HTTPS security, and use Steam’s mobile app for QR code authentication instead of directly entering credentials on the fake sites.
