Rule History

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Bad PDF Editor Tamperedchef Process Initiation"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/status/InstallStart|3f|v|3d|"; startswith; fast_pattern; pcre:"/^(?:\d{1,2}\x2e){1,4}\d/R"; content:"|26|p|3d|PDFEditor|26|code|3d|"; within:18; reference:url,truesec.com/hub/blog/tamperedchef-the-bad-pdf-editor; classtype:trojan-activity; sid:2065099; 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_08, deployment Perimeter, malware_family Tamperedchef, confidence High, signature_severity Critical, tag c2, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_10_08, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol; target:src_ip;)