135461223[.]site

The domain 135461223.site is currently listed as active and classified as a high‑risk Microsoft brand impersonation campaign. The site presents the page title “Nimblr Security Awareness” and is associated with a tech‑support scam. The domain was registered on 30 April 2020 through Abion AB and continues to resolve to the IPv4 address 116.203.212.240.

Infrastructure analysis shows the host is served by Nginx with HTTP Strict Transport Security enabled and protected by a Let’s Encrypt R12 certificate. The server resides in Germany and is announced by ASN 24940 (Hetzner Online GmbH). DNS resolution uses the authoritative name servers a.portsdns.se and b.portsdns.net, and the domain publishes an MX record pointing to mail.co-service.site with priority 10.

Reputation services assign extremely low trust scores: Gridinsoft reports 1/100 and Scamadviser also reports 1/100. VirusTotal records 14 of 95 security vendors flagging the domain, and AlienVault OTX lists the domain in 20 threat‑intelligence pulses. The domain is presently blocked by PhishDestroy and PhishingDB and appears on two additional blocklists.

Given the confirmed Microsoft impersonation, the active status, and the low trust metrics, defenders should block DNS resolution for 135461223.site, enforce TLS inspection to detect the HTTP 302 redirect, and monitor outbound connections to the associated IP and mail server. Incident response teams should also update email filtering rules to reject messages from mail.co-service.site and consider adding the observed name servers to threat‑intel watchlists.