alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE ShadowROOT RAT Malicious SSL Cert Serial Observed M2"; flow:established,to_client; tls.cert_serial; content:"00:C5:31:E7:D3:1E:AA:95:1C:F1:D3:F2:72:2C:B3:C5"; reference:md5,11d1bbdd1be9e42cfa87c5a2716794bb; classtype:trojan-activity; sid:2058968; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2025_01_06, deployment Perimeter, malware_family ShadowROOT_RAT, malware_family Liberium_RAT, performance_impact Low, confidence High, signature_severity Major, tag SSL_Malicious_Cert, updated_at 2025_01_06, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1573, mitre_technique_name Encrypted_Channel;)