alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"ET HUNTING RDP Authentication Bypass Attempt"; flow:established,to_server; content:"|03 00 00 2f 2a|"; startswith; content:"Cookie: mstshash="; dsize:<60; reference:url,pastebin.com/PSbQXJYL; classtype:attempted-admin; sid:2034857; rev:3; metadata:affected_product Microsoft_Terminal_Server_RDP, created_at 2022_01_04, deployment Perimeter, deployment Internal, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_05_03, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application; target:dest_ip;)