ET MALWARE Unknown Malvertising Payload CnC Checkin (PSecWin)

Query · suricata

flow:established,to_server;
http.method;
content:"POST";
http.uri;
content:"/?CheckApp";
http.user_agent;
content:"Mozilla/4.0|20 28|compatible|3b 20|Win32|3b 20|WinHttp.WinHttpRequest.5|29|";
http.request_body;
content:"|5c|PSecWin|0d 0a|"; fast_pattern;
target:src_ip;
Raw source ET MALWARE Unknown Malvertising Payload CnC Checkin (PSecWin) · 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 Unknown Malvertising Payload CnC Checkin (PSecWin)";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:"/?CheckApp";
    http.user_agent;
    content:"Mozilla/4.0|20 28|compatible|3b 20|Win32|3b 20|WinHttp.WinHttpRequest.5|29|";
    http.request_body;
    content:"|5c|PSecWin|0d 0a|"; fast_pattern;
    reference:md5,6bbbe6d8ca562449426f5f54e07f97db;
    classtype:trojan-activity;
    sid:2051091; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_11, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2024_02_26, deployment Perimeter, deployment SSLDecrypt, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_02_26;
    target:src_ip;
)

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