ET HUNTING Suspicious EXE Download Content-Type image/jpeg

alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET HUNTING Suspicious EXE Download Content-Type image/jpeg";
    flow:established,to_client;
    flowbits:isnotset,ET.http.binary;
    flowbits:isnotset,ET.INFO.WindowsUpdate;
    flowbits:set,ET.http.binary;
    http.content_type;
    content:"image/jpeg"; depth:10; endswith;
    file.data;
    content:"MZ"; within:2;
    byte_jump:4,58,relative,little;
    content:"PE|00 00|"; distance:-64; within:4; fast_pattern;
    classtype:policy-violation;
    sid:2026537; rev:3;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2018_10_23, deployment Perimeter, performance_impact Moderate, confidence Medium, signature_severity Major, updated_at 2020_09_16;
)