alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE MSIL/Document Stealer Exfil"; flow:established,to_server; http.method; content:"POST"; http.header_names; content:"|0d 0a|nnnnnnnmmmmmmmmmmmeeeee|0d 0a|"; http.content_type; content:"multipart/form-data|3b|"; startswith; http.header; content:"__IIIIMMMMM|0d 0a|"; fast_pattern; reference:md5,8df25eee669d222ab9e002ac7d81228f; classtype:trojan-activity; sid:2033818; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_08_27, deployment Perimeter, malware_family MSIL_Document, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_08_27;)