Rule History

alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE UNK_MysteriousElephant CnC Checkin"; flow:established,to_server; content:"|22|hostname|22 3a 22|"; content:"|22|mac|22 3a 22|"; pcre:"/^(?:[a-f0-9]{2}\x2d){5}[a-f0-9]{2}\x22/R"; content:"|22|macman|22 3a 22|"; fast_pattern; content:"|22|username|22 3a 22|"; reference:md5,43073b67b9c6c091bf0d0240df05ed04; classtype:trojan-activity; sid:2065234; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_11, attack_target Client_and_Server, tls_state plaintext, created_at 2025_10_17, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, tag UNK_MysteriousElephant, updated_at 2025_10_17, mitre_tactic_id TA0037, mitre_tactic_name Command_And_Control, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)