ET MALWARE PurpleFox Backdoor/Rootkit Download Request M1

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri;
content:"/"; startswith;
content:"?=1"; within:7; fast_pattern;
pcre:"/^[678]\d{8}$/R";
http.host;
pcre:"/^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$/";
http.header_names;
content:"|0d 0a|Accept|0d 0a|"; startswith;
content:"Accept-Encoding|0d 0a|User-Agent|0d 0a|Host|0d 0a|Connection|0d 0a|";
Raw source ET MALWARE PurpleFox Backdoor/Rootkit Download Request M1 · 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 -> $EXTERNAL_NET !80 (
    msg:"ET MALWARE PurpleFox Backdoor/Rootkit Download Request M1";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"/"; startswith;
    content:"?=1"; within:7; fast_pattern;
    pcre:"/^[678]\d{8}$/R";
    http.host;
    pcre:"/^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$/";
    http.header_names;
    content:"|0d 0a|Accept|0d 0a|"; startswith;
    content:"Accept-Encoding|0d 0a|User-Agent|0d 0a|Host|0d 0a|Connection|0d 0a|";
    reference:url,blog.minerva-labs.com/malicious-telegram-installer-drops-purple-fox-rootkit;
    reference:md5,c398b504f74500d6a1a47f72bb45bc83;
    classtype:command-and-control;
    sid:2034859; rev:2;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_01_05, deployment Perimeter, malware_family PurpleFox, performance_impact Moderate, confidence High, signature_severity Major, updated_at 2022_01_06;
)

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