Rule History

alert tcp-pkt $HOME_NET any -> $EXTERNAL_NET 1024: (msg:"ET MALWARE iMonitor EAM CnC Agent Request (*FILEHEADER*)"; flow:established,to_server; flowbits:isset,ET.iMonitor.Checkin; content:"|2a|FILEHEADER|2a 01|C|3a 5c|"; startswith; fast_pattern; content:"|01|"; endswith; threshold:type limit,count 1,seconds 300,track by_src; reference:url,x.com/Jane_0sint/status/1977826605767721158; reference:md5,447338af0ea5509735050add5ba9192a; classtype:command-and-control; sid:2065206; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state plaintext, created_at 2025_10_15, deployment Perimeter, malware_family iMonitor, confidence High, signature_severity Critical, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_10_15, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1219, mitre_technique_name Remote_Access_Software; target:src_ip;)