A large-scale fake account creation campaign was detected involving tens of thousands of bot-driven registrations using 330 unique custom email domains created within a short timeframe. Attackers used a modified Chrome browser with anti-detection techniques such as canvas randomization to evade fingerprinting and detection. The use of numerous custom domains, which appeared legitimate and were not on public blocklists, complicated traditional anti-abuse defenses. This campaign highlights the limitations of static disposable domain lists and underscores the need for multi-layered defenses including behavioral analysis, proxy detection, fingerprinting, and email intelligence. The threat is medium severity due to the complexity of evasion and potential for abuse but does not involve direct exploitation or system compromise. European organizations with online services requiring account creation are at risk, especially those lacking advanced bot and fraud detection capabilities. Countries with high digital service adoption and significant online user bases are more likely to be targeted. Defenders should implement dynamic domain reputation systems, advanced browser fingerprinting, and continuous behavioral monitoring to mitigate this threat effectively.
