alert http [$HOME_NET,$SMTP_SERVERS] any -> any any (msg:"ET MALWARE JS SpyPress C2 Success Callback (PHP)"; flow:established,to_server; http.request_line; content:"GET /?se=ph"; fast_pattern; startswith; http.header_names; to_lowercase; content:!"user-agent|0d 0a|"; http.method; content:"GET"; reference:url,www.proofpoint.com/us/blog/threat-insight/ta458-roundpress-exploits; classtype:trojan-activity; sid:2071251; rev:1; metadata:attack_target Client_Endpoint, created_at 2026_07_21, deployment Perimeter, malware_family SpyPress, confidence High, signature_severity Major, tag c2, updated_at 2026_07_21, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel; target:src_ip;)