ET MALWARE Win32/Colibri Loader Activity

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri;
content:".php?type=check&uid="; fast_pattern;
pcre:"/^[0-9A-F]{16,32}$/Rs";
http.user_agent;
content:!"Mozilla";
content:!"Safari";
content:!"Opera";
pcre:"/^[A-Za-z0-9]{16,32}$/";
http.header_names;
content:"|0d 0a|User-Agent|0d 0a|Host|0d 0a 0d 0a|"; bsize:22;
content:!"Referer";
Raw source ET MALWARE Win32/Colibri Loader Activity · 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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE Win32/Colibri Loader Activity";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:".php?type=check&uid="; fast_pattern;
    pcre:"/^[0-9A-F]{16,32}$/Rs";
    http.user_agent;
    content:!"Mozilla";
    content:!"Safari";
    content:!"Opera";
    pcre:"/^[A-Za-z0-9]{16,32}$/";
    http.header_names;
    content:"|0d 0a|User-Agent|0d 0a|Host|0d 0a 0d 0a|"; bsize:22;
    content:!"Referer";
    reference:md5,9bf1574b794c7937cdbd12a9ff6fba76;
    classtype:command-and-control;
    sid:2034049; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_09_29, deployment Perimeter, malware_family Win32_Colibri, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_09_29;
)

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