ET PHISHING Obfuscated Javascript from Generic Phishkit


Query · suricata

flow:established,to_client;
http.stat_code;
content:"200";
file.data;
content:"var|20|"; startswith;
pcre:"/^(?P<arrayName>[a-z]{1,50})\x20\x3d\x20new\x20Array\x3b\x0a((?P=arrayName)\x5b){1,50}/R";
content:"for(i=0|3b|"; distance:0;
content:"Math.pow("; distance:0;
content:"String.fromCharCode(Math.floor("; distance:0; fast_pattern;
content:"document.write("; distance:0;
content:")|3b|"; endswith;
Raw source ET PHISHING Obfuscated Javascript from Generic Phishkit · 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 PHISHING Obfuscated Javascript from Generic Phishkit";
    flow:established,to_client;
    http.stat_code;
    content:"200";
    file.data;
    content:"var|20|"; startswith;
    pcre:"/^(?P<arrayName>[a-z]{1,50})\x20\x3d\x20new\x20Array\x3b\x0a((?P=arrayName)\x5b){1,50}/R";
    content:"for(i=0|3b|"; distance:0;
    content:"Math.pow("; distance:0;
    content:"String.fromCharCode(Math.floor("; distance:0; fast_pattern;
    content:"document.write("; distance:0;
    content:")|3b|"; endswith;
    reference:url,trendmicro.com/en_us/research/23/k/threat-actors-leverage-file-sharing-service-and-reverse-proxies.html;
    reference:url,obsidiansecurity.com/blog/detecting-aitm-phishing-sites-with-fuzzy-hashing/;
    classtype:credential-theft;
    sid:2049692; rev:2;
    metadata:attack_target Client_Endpoint, created_at 2023_12_14, deployment Perimeter, deployment SSLDecrypt, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_02_07, mitre_tactic_id TA0005, mitre_tactic_name Defense_Evasion, mitre_technique_id T1027, mitre_technique_name Obfuscated_Files_or_Information;
)

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