alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed StealC_V2 Secondary Payload Request (GET)"; flow:established,to_server; urilen:13; http.method; content:"GET"; http.uri; content:"/software.dll"; fast_pattern; http.host; pcre:"/^(?:[0-9]{1,3}\.){3}[0-9]{1,3}$/"; http.header_names; content:!"|0d 0a|referer|0d 0a|"; nocase; classtype:trojan-activity; sid:2069233; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2026_05_08, deployment Perimeter, deployment SSLDecrypt, confidence High, signature_severity Major, updated_at 2026_05_08, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1105, mitre_technique_name Ingress_Tool_Transfer; target:src_ip;)