alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE NORTHSTAR Client Data POST"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/getjuice.php"; bsize:13; fast_pattern; http.content_type; content:"multipart/form-data|3b| boundary=---------------------"; startswith; http.header; content:"|0d 0a|Expect|3a 20|100-continue|0d 0a|"; http.header_names; content:!"Referer"; content:!"User-Agent"; reference:url,github.com/EnginDemirbilek/NorthStarC2/; classtype:trojan-activity; sid:2030189; rev:1; metadata:attack_target Client_Endpoint, created_at 2020_05_19, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_05_19;)