505[.]top

This domain, 505.top, has been identified as a credential theft operation designed to harvest user login credentials through deceptive web pages. The domain is currently offline, but prior analysis confirms its malicious intent, with no legitimate use case detected. The page title '欢迎' (Welcome) suggests a localized or broad targeting approach, likely aimed at Mandarin-speaking users or a global audience. Analysis of 505.top reveals it was created on October 18, 2025, and registered through PDR Ltd. d/b/a PublicDomainRegistry.com. The domain resolves to the IP address 45.195.57.176, hosted in Hong Kong under AS132813 (HK AISI CLOUD COMPUTING LIMITED). Security vendors on VirusTotal flagged this domain, with 17 of 95 engines detecting malicious activity. The domain appears on one security blocklist, and no SSL certificate was present, further indicating a lack of legitimate infrastructure. Infrastructure analysis reveals the use of a low-reputation registrar and hosting provider, common in phishing operations. As of the latest verification, 505.top has been taken offline, reducing immediate risk. However, organizations and users should remain vigilant. Network administrators are advised to block the domain and its resolving IP (45.195.57.176) at the perimeter. Endpoint protection systems should be updated to include this domain in deny lists. Users who may have interacted with the domain should reset credentials for any accounts accessed during the exposure window and enable multi-factor authentication where possible. Monitoring for related domains registered through the same registrar or resolving to the same IP range is recommended for proactive threat detection.