alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET EXPLOIT Possible Spectre PoC Download In Progress"; flow:established,from_server; flowbits:isset,ET.http.binary; file_data; content:"|E7 03 00 00|"; content:"|48 0F AE|"; distance:17; within:9; pcre:"/^[\x30-\x3f\x7D]/Rs"; content:"|48 0F AE 3D|"; distance:41; within:10; content:"|48 98|"; distance:64; within:22; content:"|0F 01 F9|"; distance:50; within:9; content:"|0F 01 F9|"; distance:30; within:9; reference:cve,2017-5753; reference:cve,2017-5715; classtype:attempted-admin; sid:2025196; rev:2; metadata:attack_target Client_Endpoint, created_at 2018_01_10, cve CVE_2017_5753, deployment Perimeter, malware_family Spectre_Exploit, performance_impact Low, confidence Medium, signature_severity Major, updated_at 2019_07_26;)