ET MALWARE W32/Patchwork.Backdoor Communicating with CnC

Query · suricata

flow:established,to_server;
http.method;
content:"POST";
http.uri;
content:".php?cx="; nocase; fast_pattern;
content:"&b="; nocase; distance:0;
content:"&gt="; nocase; distance:0;
content:"&tx="; nocase; distance:0;
pcre:"/\.php\?cx=[A-F0-9]+&b=[A-F0-9]+&gt=[A-F0-9]+&tx=[A-F0-9]+$/i";
http.content_len;
byte_test:0,=,0,0,string,dec;
Raw source ET MALWARE W32/Patchwork.Backdoor Communicating with CnC · 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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE W32/Patchwork.Backdoor Communicating with CnC";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:".php?cx="; nocase; fast_pattern;
    content:"&b="; nocase; distance:0;
    content:"&gt="; nocase; distance:0;
    content:"&tx="; nocase; distance:0;
    pcre:"/\.php\?cx=[A-F0-9]+&b=[A-F0-9]+&gt=[A-F0-9]+&tx=[A-F0-9]+$/i";
    http.content_len;
    byte_test:0,=,0,0,string,dec;
    reference:md5,ddeabe234c4084ba379cf3be4fdf503d;
    classtype:command-and-control;
    sid:2025163; rev:5;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_12_21, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_11_09;
)

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