ET MALWARE Suspected CloudAtlas APT Related Activity (GET)

Query · suricata

flow:established,to_server;
http.method;
content:"HEAD";
http.uri;
content:"/?"; startswith; fast_pattern;
content:".php?id="; distance:0;
http.user_agent;
content:"Microsoft Office"; startswith;
http.header_names;
content:!"Referer|0d 0a|";
target:src_ip;
Raw source ET MALWARE Suspected CloudAtlas APT Related Activity (GET) · Suricata
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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 Suspected CloudAtlas APT Related Activity (GET)";
    flow:established,to_server;
    http.method;
    content:"HEAD";
    http.uri;
    content:"/?"; startswith; fast_pattern;
    content:".php?id="; distance:0;
    http.user_agent;
    content:"Microsoft Office"; startswith;
    http.header_names;
    content:!"Referer|0d 0a|";
    reference:md5,a51d18cc42a9ac76d331913049cb0ffc;
    reference:url,twitter.com/t3ft3lb/status/1651154256294977537;
    classtype:trojan-activity;
    sid:2045304; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2023_05_03, deployment Perimeter, deployment SSLDecrypt, performance_impact Significant, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_05_03;
    target:src_ip;
)

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