ET MALWARE Observed 3CX Supply Chain Attack Cookie M2

Query · suricata

flow:to_server,established;
http.cookie;
content:"3cx_auth_id="; startswith;
content:"|3b|__tutma=true"; endswith; fast_pattern;
target:src_ip;
Raw source ET MALWARE Observed 3CX Supply Chain Attack Cookie M2 · 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 MALWARE Observed 3CX Supply Chain Attack Cookie M2";
    flow:to_server,established;
    http.cookie;
    content:"3cx_auth_id="; startswith;
    content:"|3b|__tutma=true"; endswith; fast_pattern;
    reference:url,www.volexity.com/blog/2023/03/30/3cx-supply-chain-compromise-leads-to-iconic-incident/;
    reference:url,twitter.com/patrickwardle/status/1641699867176374273;
    reference:url,objective-see.org/blog/blog_0x73.html;
    classtype:trojan-activity;
    sid:2044849; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2023_03_31, deployment Perimeter, deployment SSLDecrypt, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_03_31, reviewed_at 2024_05_07;
    target:src_ip;
)

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