ET WEB_CLIENT Possible Injected JS Form Stealer Checking Page Contents M2

Query · suricata

flow:established,from_server;
http.stat_code;
content:"200";
file.data;
content:"location.href.search|28|atob|28 27|Y";
pcre:"/^[2'][2h'+][2hl'+][2hlY'+][2hlY2'+][2hlY2t'+][2hlY2tv'+][2hlY2tvd'+][2hlY2tvdX'+][2hlY2tvdXQ'+](?:[2hlY2tvdXQ='+]){1,10}/R";
content:"|20|=|20|atob|28 27|aHR0cHM6L"; within:300; fast_pattern;
Raw source ET WEB_CLIENT Possible Injected JS Form Stealer Checking Page Contents M2 · Suricata
Esc
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 M2";
    flow:established,from_server;
    http.stat_code;
    content:"200";
    file.data;
    content:"location.href.search|28|atob|28 27|Y";
    pcre:"/^[2'][2h'+][2hl'+][2hlY'+][2hlY2'+][2hlY2t'+][2hlY2tv'+][2hlY2tvd'+][2hlY2tvdX'+][2hlY2tvdXQ'+](?:[2hlY2tvdXQ='+]){1,10}/R";
    content:"|20|=|20|atob|28 27|aHR0cHM6L"; within:300; 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:2027816; 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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