alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Tiggre Variant Activity Sending System Files (POST)"; flow:established,to_server; http.request_line; content:"POST /up/up.php HTTP/1.1"; fast_pattern; http.content_type; content:"multipart/form-data|3b 20|boundary=---------------------"; startswith; http.header_names; content:"|0d 0a|Host|0d 0a|Content-Length|0d 0a|Expect|0d 0a|Connection|0d 0a 0d 0a|"; endswith; http.host; pcre:"/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/"; http.request_body; content:"form-data|3b 20|name=|22|file|22 3b|"; reference:md5,a023ece310a490a87e77c9bb28b6415b; classtype:trojan-activity; sid:2034962; rev:3; metadata:attack_target Client_Endpoint, created_at 2022_01_25, deployment Perimeter, malware_family Win32_Tiggre, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_02_24;)