t-mobile[.]siummer[.]top

The domain t-mobile.siummer.top has been identified as a brand impersonation phishing site targeting T-Mobile customers. Analysis indicates this domain was actively used to mimic official T-Mobile branding, likely to deceive users into disclosing sensitive credentials or personal information. The domain is currently offline, but prior activity warrants continued monitoring and caution. Infrastructure analysis reveals the domain was created on May 15, 2026, and registered through NameSilo, LLC. It resolves to the IP address 188.114.96.3 and was flagged by 15 of 95 security vendors on VirusTotal. The domain appears on one security blocklist and has a Gridinsoft trust score of 0/100. Detected technologies include Cloudflare, Cloudflare Browser Insights, and HTTP/3, suggesting the use of content delivery networks to obfuscate malicious activity. The page title, "Welcome to OpenResty!", further indicates the deployment of a web server framework commonly associated with phishing infrastructure. Current status confirms the domain is offline, but residual risk remains due to its recent malicious activity. Organizations and users are advised to block the domain and its associated IP address (188.114.96.3) at the network level. Security teams should monitor for similar impersonation domains registered through NameSilo or resolving to the same IP range. End-users should verify the legitimacy of any T-Mobile-related communications and avoid interacting with unsolicited links or login prompts.