ET MALWARE SpyAgent C&C Activity (Request)

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri;
content:"update.php?id="; fast_pattern;
pcre:"/^[0-9]{9}/R";
content:"&stat=";
pcre:"/^[0-9a-zA-Z]{32}/R";
http.connection;
content:"Keep-Alive"; bsize:10;
http.header_names;
content:!"Referer|0d 0a|";
Raw source ET MALWARE SpyAgent C&C Activity (Request) · 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 SpyAgent C&C Activity (Request)";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"update.php?id="; fast_pattern;
    pcre:"/^[0-9]{9}/R";
    content:"&stat=";
    pcre:"/^[0-9a-zA-Z]{32}/R";
    http.connection;
    content:"Keep-Alive"; bsize:10;
    http.header_names;
    content:!"Referer|0d 0a|";
    reference:url,trendmicro.com/en_us/research/21/k/campaign-abusing-rats-uses-fake-websites.html;
    classtype:command-and-control;
    sid:2034573; rev:2;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_12_01, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_05_03;
)

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