alert http $HOME_NET any -> $EXTERNAL_NET 1024: (msg:"ET MALWARE Pikabot Related Activity M5 (POST)"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/api/"; startswith; pcre:"/^(?:(admin|apps|api))\.[^\r\n]+\.(?:(list|test|listGroups|deny|request|removeGroup|invalidate))$/R"; http.host; pcre:"/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/"; http.header_names; strip_pseudo_headers; to_lowercase; content:"|0d 0a|cache-control|0d 0a|"; startswith; content:!"|0d 0a|referer|0d 0a|"; http.request_body; content:"|00 00|"; startswith; content:"|00 00 12 91 00 00 16 87 00 00 00|"; fast_pattern; distance:2; within:11; reference:md5,62a72000766f207bcadb39f449034fc0; classtype:trojan-activity; sid:2050874; rev:2; metadata:attack_target Client_Endpoint, created_at 2024_02_14, deployment Perimeter, deployment SSLDecrypt, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_27; target:src_ip;)