ET MALWARE Winos4.0 Framework CnC Login Message

alert tcp-pkt $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Winos4.0 Framework CnC Login Message";
    flow:established,to_server;
    flowbits:set,ET.Winos4.Login;
    dsize:14<>64;
    byte_jump:4,0,little, post_offset -5;
    isdataat:!2,relative;
    content:"|00 00 00 00 00 ca|"; depth:13; fast_pattern;
    pcre:"/^(?:\x00|\x01)/R";
    threshold:type limit, count 1, seconds 60, track by_src;
    reference:md5,db9fd417244157770e31fb4b39e0e97a;
    reference:url,fortinet.com/blog/threat-research/threat-campaign-spreads-winos4-through-game-application;
    classtype:command-and-control;
    sid:2052875; rev:7;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_11, attack_target Client_and_Server, tls_state plaintext, created_at 2024_05_23, deployment Perimeter, deployment SSLDecrypt, malware_family Winos4_0, performance_impact Low, confidence High, signature_severity Critical, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_09_29, reviewed_at 2024_10_04;
    target:src_ip;
)