b3550[.]com

This domain is flagged as a high-risk fake login portal designed to harvest user credentials through deceptive authentication interfaces. Analysis indicates the site mimics legitimate login pages, likely targeting corporate or financial service users to capture sensitive account details. The threat type aligns with credential phishing campaigns observed in recent months, where attackers exploit trusted visual branding to lower user vigilance. Infrastructure analysis reveals the domain b3550.com was registered on April 29, 2026, through GoDaddy.com, LLC, a registrar frequently leveraged by threat actors for rapid domain deployment. The domain resolves to IP address 52.175.17.154, hosted in Hong Kong under AS8075 (Microsoft Corporation), a network segment occasionally abused for transient phishing operations. The SSL certificate, issued by Sectigo Limited (Sectigo Public Server Authentication CA DV R36), appears valid but offers no inherent trust, as Domain Validation certificates are routinely used in malicious campaigns. Detection metrics show 15 out of 95 security vendors on a major threat intelligence platform have flagged the domain, while a single security blocklist and one proprietary detection system have also identified it as malicious. The domain remains active at the time of assessment, with no evidence of takedown or remediation. Mitigation against this fake login portal requires immediate action from network administrators and end users. Organizations should block the domain b3550.com and its resolving IP 52.175.17.154 at the perimeter firewall or DNS level to prevent access. Users who may have interacted with the site should reset credentials for any accounts entered, prioritizing accounts with elevated privileges or financial access. Multi-factor authentication (MFA) should be enforced where available to mitigate the impact of credential theft. Security teams are advised to monitor logs for connections to the domain or IP, particularly from endpoints exhibiting unusual authentication attempts or failed login patterns. Given the domain's recent registration and active status, heightened vigilance is recommended for similar infrastructure patterns, including domains registered through GoDaddy with short lifespans and hosting in cloud environments.