ET MALWARE Jupyter Stealer CnC Checkin

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Jupyter Stealer CnC Checkin";
    flow:established,to_server;
    http.start;
    content:"POST / HTTP/1.1|0d 0a|Host|3a 20|"; startswith;
    http.host.raw;
    pcre:"/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/";
    http.header_names;
    content:"|0d 0a|Host|0d 0a|Content-Length|0d 0a|Connection|0d 0a 0d 0a|"; bsize:38; fast_pattern;
    http.content_len;
    byte_test:0,>=,200,0,string,dec;
    byte_test:0,<=,999,0,string,dec;
    http.connection;
    content:"Keep-Alive"; bsize:10;
    http.request_body;
    content:!"|0d 0a|";
    pcre:"/^[\x20-\x7e\r\n]{0,20}[^\x20-\x7e\r\n]/";
    reference:url,blog.morphisec.com/new-jupyter-evasive-delivery-through-msi-installer;
    reference:md5,c4772d76029004a5512ea6e2ff3be39b;
    classtype:command-and-control;
    sid:2034024; rev:2;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_09_24, deployment Perimeter, malware_family Jupyter, performance_impact Significant, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_09_28;
)