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36.255.223.187 has a very high threat confidence level of 87%, originating from Singapore, on the UCLOUD INFORMATION TECHNOLOGY HK LIMITED network (135377). It has been observed across 215 sessions targeting MONGODB, SMTP, HTTP, HTTPS, POSTGRES and 10 other protocols, First observed on January 22, 2026, most recently active March 5, 2026.
Client sends RTSP OPTIONS requests to check supported methods and confirm that an RTSP service is exposed, then disconnects without attempting authentication or stream setup. This pattern is typically associated with automated reconnaissance or internet-wide scanning rather than active stream access.
Client first performs a generic request to the Elasticsearch root endpoint to verify service availability, then proceeds to request /_cat/indices. This sequence reflects staged Elasticsearch reconnaissance where the actor validates that the cluster is reachable before attempting index enumeration and data exposure assessment. Compared to direct index enumeration behaviors, the interaction begins with a service-validation step, suggesting adaptive probing rather than immediate Elasticsearch-specific targeting.
Client connects to a MongoDB instance and issues isMaster followed by buildinfo, indicating an attempt to identify server role, capabilities, and software version. This pattern is commonly associated with automated discovery or fingerprinting of exposed MongoDB services rather than normal application activity.
Automated SMTP interaction performing a minimal capability check by issuing EHLO followed by a STARTTLS upgrade request and immediately terminating the session. This pattern is commonly associated with internet-wide scanners, security research crawlers, or opportunistic bots verifying whether an SMTP service supports encrypted communication. The absence of authentication attempts or message submission indicates reconnaissance or service fingerprinting rather than active abuse.
Identifies HTTPS requests targeting the web server root path ("/"), typically used for initial service discovery, host validation, or baseline content inspection prior to deeper enumeration
Identifies HTTP GET requests directly targeting the /bad-request path, indicating automated or manual probing of application error-handling routes rather than legitimate navigation flow.