alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/NitroStealer CnC Exfil M2"; flow:established,to_server; http.method; content:"POST"; http.uri; content:".php"; endswith; http.request_body; content:"Content-Disposition|3a 20|form-data|3b 20|name=|22|file|22 3b 20|filename=|22|nitropacked.zip|22 0d 0a|"; fast_pattern; content:"screenshot"; nocase; distance:0; http.header_names; content:!"Referer"; content:!"User-Agent"; reference:md5,367ef1b1579a6987d5648bb95f7c9a10; classtype:trojan-activity; sid:2033361; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_07_19, deployment Perimeter, malware_family Win32_NitroStealer, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_07_19;)