ET WEB_CLIENT Possible Injected JS Form Stealer Checking Page Contents M1

Query · suricata

flow:established,from_server;
http.stat_code;
content:"200";
file.data;
content:"var|20|_0x";
content:"|27 5c|x61|5c|x57|5c|x35|5c|x75|5c|x5a|5c|x58|5c|x4a|5c|x49|5c|x5a"; within:150; fast_pattern;
Raw source ET WEB_CLIENT Possible Injected JS Form Stealer Checking Page Contents M1 · 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_CLIENT Possible Injected JS Form Stealer Checking Page Contents M1";
    flow:established,from_server;
    http.stat_code;
    content:"200";
    file.data;
    content:"var|20|_0x";
    content:"|27 5c|x61|5c|x57|5c|x35|5c|x75|5c|x5a|5c|x58|5c|x4a|5c|x49|5c|x5a"; within:150; fast_pattern;
    reference:url,www.symantec.com/content/dam/symantec/docs/security-center/white-papers/istr-formjacking-deep-dive-en.pdf;
    classtype:trojan-activity;
    sid:2027815; rev:3;
    metadata:affected_product Web_Browsers, attack_target Client_Endpoint, created_at 2019_08_07, deployment Perimeter, deployment SSLDecrypt, performance_impact Low, confidence Medium, signature_severity Major, tag CardSkimmer, updated_at 2020_11_18;
)

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