ET MALWARE Winos4.0 Framework CnC Login Message CnC Server Response

Query · suricata

flow:established,to_client;
flowbits:isset,ET.Winos4.Login;
dsize:14<>128;
byte_jump:4,0,little, post_offset -5;
isdataat:!2,relative;
content:"|00 00 00 00 ca|"; depth:13; fast_pattern;
pcre:"/^(?:\x00|\x01)/R";
threshold:type limit, count 1, seconds 60, track by_src;
target:src_ip;

Rule dependencies

⚠ Higher-order rule. It fires on other rules' alerts, not on raw events, so it cannot fire on its own. Deploy the rules it depends on too.

Depends on

Raw source ET MALWARE Winos4.0 Framework CnC Login Message CnC Server Response · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert tcp-pkt $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET MALWARE Winos4.0 Framework CnC Login Message CnC Server Response";
    flow:established,to_client;
    flowbits:isset,ET.Winos4.Login;
    dsize:14<>128;
    byte_jump:4,0,little, post_offset -5;
    isdataat:!2,relative;
    content:"|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:2059975; rev:2;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state plaintext, created_at 2025_02_07, deployment Perimeter, malware_family Winos4_0, confidence High, signature_severity Critical, tag c2, updated_at 2025_03_03, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1573, mitre_technique_name Encrypted_Channel;
    target:src_ip;
)

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