alert http1 $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE FIN7 JSSLoader Variant Activity (GET)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/?id="; startswith; fast_pattern; pcre:"/^[A-Z]{14}$/R"; http.header_names; bsize:10; content:"|0d 0a|Host|0d 0a 0d 0a|"; reference:url,www.crowdstrike.com/blog/carbon-spider-embraces-big-game-hunting-part-1/; reference:md5,bf23c48d111f5a2d3169062428940b1c; classtype:trojan-activity; sid:2033889; rev:3; metadata:attack_target Client_Endpoint, created_at 2021_09_02, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag FIN7, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_04;)