ET MALWARE Suspected ToddyCat APT Curlu Related Activity M2

Query · suricata

flow:established,to_server;
http.method;
content:"POST";
http.uri;
content:"/?cur="; startswith; fast_pattern;
pcre:"/^[0-9]{5}$/R";
http.content_type;
content:"application/x-www-form-urlencoded"; bsize:33;
http.header_names;
content:!"Referer";
target:src_ip;
Raw source ET MALWARE Suspected ToddyCat APT Curlu Related Activity 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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE Suspected ToddyCat APT Curlu Related Activity M2";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:"/?cur="; startswith; fast_pattern;
    pcre:"/^[0-9]{5}$/R";
    http.content_type;
    content:"application/x-www-form-urlencoded"; bsize:33;
    http.header_names;
    content:!"Referer";
    reference:md5,b31c32af306d736572263371afbd1802;
    reference:url,research.checkpoint.com/2023/stayin-alive-targeted-attacks-against-telecoms-and-government-ministries-in-asia/;
    classtype:trojan-activity;
    sid:2049417; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2023_11_30, deployment Perimeter, performance_impact Low, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_11_30;
    target:src_ip;
)

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