ET RETIRED JynxLoaderV2 CnC Checkin

Query · suricata

flow:established,to_server;
http.request_line;
content:"POST / HTTP/1.1";
http.user_agent;
content:"4a696e785632"; startswith; fast_pattern;
http.header_names;
content:!"|0d 0a|Referer|0d 0a|";
http.content_len;
byte_test:0,>,200,0,string,dec;
byte_test:0,<,300,0,string,dec;
http.request_body;
pcre:"/^[a-f0-9]{200}/";
content:"7c31";
target:src_ip;
Raw source ET RETIRED JynxLoaderV2 CnC Checkin · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET RETIRED JynxLoaderV2 CnC Checkin";
    flow:established,to_server;
    http.request_line;
    content:"POST / HTTP/1.1";
    http.user_agent;
    content:"4a696e785632"; startswith; fast_pattern;
    http.header_names;
    content:!"|0d 0a|Referer|0d 0a|";
    http.content_len;
    byte_test:0,>,200,0,string,dec;
    byte_test:0,<,300,0,string,dec;
    http.request_body;
    pcre:"/^[a-f0-9]{200}/";
    content:"7c31";
    reference:url,twitter.com/Unit42_Intel/status/1730237085246775562;
    reference:md5,46ce034ff575452d1d26c2002788f403;
    classtype:trojan-activity;
    sid:2049408; rev:2;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_11, attack_target Client_and_Server, created_at 2023_11_30, deployment Perimeter, former_category MALWARE, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_07_14, reviewed_at 2025_07_14;
    target:src_ip;
)

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