Rule History

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE GCleaner Loader CnC Checkin (/info)"; flow:established,to_server; urilen:5; http.uri; content:"/info"; fast_pattern; http.accept; bsize:117; content:"text|2f|html|2c 20|application|2f|xml|3b|q|3d|0|2e|9|2c 20|application|2f|xhtml|2b|xml|2c 20|image|2f|png|2c 20|image|2f|jpeg|2c 20|image|2f|gif|2c 20|image|2f|x|2d|xbitmap|2c 20 2a 2f 2a 3b|q|3d|0|2e|1"; http.accept_lang; content:"ru-RU"; startswith; http.user_agent; bsize:1; pcre:"/^.$/"; reference:md5,e627cad277450feb0685a9b2abd981f8; reference:md5,9c44f98f428e7a562553944c3067f73b; classtype:domain-c2; sid:2064237; 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_09_02, deployment Perimeter, deployment Internal, malware_family GCleaner, performance_impact Moderate, confidence High, signature_severity Critical, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_09_02, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol; target:src_ip;)