alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO DYNAMIC_DNS HTTP Request to a *.efxs .ca Domain"; flow:established,to_server; http.host; content:".efxs.ca"; endswith; reference:url,freedns.afraid.org/domain/registry/page-10.html; classtype:bad-unknown; sid:2049220; rev:1; metadata:attack_target Client_and_Server, created_at 2023_11_16, deployment Perimeter, signature_severity Informational, updated_at 2023_11_16, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1568, mitre_technique_name Dynamic_Resolution;)

Reference
URL	http://freedns.afraid.org/domain/registry/page-10.html

Metadata
attack_target	Client_and_Server
created_at	2023_11_16
deployment	Perimeter
signature_severity	Informational
updated_at	2023_11_16
Mitre Tactic ID	https://attack.mitre.org/tactics/TA0011
Mitre Tactic Name	Command_And_Control
Mitre Technique ID	https://attack.mitre.org/techniques/T1568
Mitre Techniques Name	Dynamic_Resolution