alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE OrbitalBeam CnC Response (Info)"; flow:established,to_client; flowbits:isset,ET.OrbitalBeamInfo; http.header; content:"Connection|3a 20|close|0d 0a|"; http.content_type; content:"text/plain"; bsize:10; http.content_len; content:"38"; bsize:2; fast_pattern; http.response_body; pcre:"/^(?:(?:[a-z0-9]{8})\x2d(?:[a-z0-9]{4})\x2d(?:[a-z0-9]{4})\x2d(?:[a-z0-9]{4})\x2d(?:[a-z0-9]{12}))\x3a\d$/"; threshold:type limit,track by_src,count 1,seconds 300; classtype:trojan-activity; sid:2050011; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2024_01_11, deployment Perimeter, performance_impact Significant, confidence High, signature_severity Critical, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_01_11;)