ET MALWARE [ANY.RUN] DarkCrystal Rat Check-in (POST)

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE [ANY.RUN] DarkCrystal Rat Check-in (POST)";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:".php"; endswith;
    http.content_len;
    byte_test:0,>,320,0,string,dec;
    byte_test:0,<,370,0,string,dec;
    http.request_body;
    content:"|05 06 02 01 02|"; offset:8; depth:5; fast_pattern;
    http.header;
    content:"Expect|3a 20|100|2d|continue|0d 0a|Connection|3a 20|";
    http.header_names;
    content:"|0d 0a|Content-Type|0d 0a|User-Agent|0d 0a|Host|0d 0a|Content-Length|0d 0a|Expect|0d 0a|Connection|0d 0a 0d 0a|"; bsize:72;
    reference:md5,8dd1baebdcaee56ce4e4382e7071bd3d;
    reference:url,app.any.run/tasks/730814fe-b061-4b67-8ff1-4455998e99f6;
    classtype:trojan-activity;
    sid:2048095; rev:2;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_09_15, deployment Perimeter, malware_family DCRat, confidence High, signature_severity Critical, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_09_20, reviewed_at 2024_01_26;
)