ET WEB_SERVER ASPXSPY Webshell Login Attempt

Query · suricata

flow:established,to_server;
http.method;
content:"POST";
http.uri;
content:".aspx"; endswith;
http.request_body;
content:"|5f 5f|EVENTTARGET|3d 26 5f 5f|FILE|3d|"; startswith;
content:"HRJ|3d|";
content:"|26|ZSnXu=Login"; fast_pattern; endswith;
target:dest_ip;
Raw source ET WEB_SERVER ASPXSPY Webshell Login Attempt · Suricata
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Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET WEB_SERVER ASPXSPY Webshell Login Attempt";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:".aspx"; endswith;
    http.request_body;
    content:"|5f 5f|EVENTTARGET|3d 26 5f 5f|FILE|3d|"; startswith;
    content:"HRJ|3d|";
    content:"|26|ZSnXu=Login"; fast_pattern; endswith;
    reference:md5,2ef7bb0d9763cf38977182d65173d1b0;
    classtype:trojan-activity;
    sid:2046744; rev:1;
    metadata:affected_product Microsoft_IIS, attack_target Web_Server, created_at 2023_07_06, deployment Perimeter, deployment Internal, deployment SSLDecrypt, malware_family ASPXSPY, performance_impact Low, confidence High, signature_severity Major, tag WebShell, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_07_06;
    target:dest_ip;
)

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