alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE FIN7 JSSLoader Activity (POST)"; flow:established,to_server; http.request_line; content:"POST /?id="; startswith; fast_pattern; http.uri; pcre:"/^\/\?id\=[A-Z]{12,28}[0-9]$/"; http.header_names; content:"|0d 0a|Host|0d 0a|Content-Length|0d 0a|Expect|0d 0a|Connection|0d 0a 0d 0a|"; bsize:46; reference:md5,6f743e8fda2031db9907a8d6bd0a41a8; reference:url,blog.morphisec.com/new-jssloader-trojan-delivered-through-xll-files; classtype:trojan-activity; sid:2035609; rev:1; metadata:attack_target Client_Endpoint, created_at 2022_03_25, deployment Perimeter, deployment SSLDecrypt, malware_family FIN7, malware_family CarbonSpider, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_03_25;)