ET HUNTING Base64 Encoded Null Byte Padded File in HTML Body (Magic Bytes)

Query · suricata

flow:established,to_client;
file_data;
content:"data|3a|"; nocase;
content:"base64,AAAAAAAA"; within:65; fast_pattern;
flowbits:set,et.exploitkitlanding;
target:dest_ip;

Rule dependencies

Feeds into

  • 7 rules read et.exploitkitlanding · view all
Raw source ET HUNTING Base64 Encoded Null Byte Padded File in HTML Body (Magic Bytes) · 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 HUNTING Base64 Encoded Null Byte Padded File in HTML Body (Magic Bytes)";
    flow:established,to_client;
    file_data;
    content:"data|3a|"; nocase;
    content:"base64,AAAAAAAA"; within:65; fast_pattern;
    flowbits:set,et.exploitkitlanding;
    reference:url,urlscan.io/result/98d7e72b-67b8-4d7c-9735-c27525b0a550/#transactions;
    classtype:misc-activity;
    sid:2047791; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2023_08_28, deployment Perimeter, deployment SSLDecrypt, performance_impact Low, confidence High, signature_severity Informational, tag HTML_Smuggling, updated_at 2023_10_06, reviewed_at 2023_08_28, mitre_tactic_id TA0005, mitre_tactic_name Defense_Evasion, mitre_technique_id T1027, mitre_technique_name Obfuscated_Files_or_Information;
    target:dest_ip;
)

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