ET MALWARE Kraken Stealer SMTP Data Exfiltration Attempt

Query · suricata

flow:established,to_server;
content:"Subject|3a 20 20|Recovered From|3a 20|";
content:"Content-Type|3a 20|text/plain|3b 20|name|3d|RecoveredPassword.txt"; distance:0;
content:"Content-Disposition|3a 20|attachment|0d 0a 0d 0a|"; distance:0;
content:"IAB8AFMAeQBzAHQAZQBtACAASQBuAGYAbwB8AA0ACg"; distance:0; fast_pattern;
target:src_ip;
Raw source ET MALWARE Kraken Stealer SMTP Data Exfiltration Attempt · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert smtp $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Kraken Stealer SMTP Data Exfiltration Attempt";
    flow:established,to_server;
    content:"Subject|3a 20 20|Recovered From|3a 20|";
    content:"Content-Type|3a 20|text/plain|3b 20|name|3d|RecoveredPassword.txt"; distance:0;
    content:"Content-Disposition|3a 20|attachment|0d 0a 0d 0a|"; distance:0;
    content:"IAB8AFMAeQBzAHQAZQBtACAASQBuAGYAbwB8AA0ACg"; distance:0; fast_pattern;
    reference:url,0xtoxin.github.io/malware analysis/KrakenKeylogger-pt1/;
    reference:md5,5bc9ee4bec5e31f4ed64fefa92ef5f2b;
    classtype:trojan-activity;
    sid:2045841; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_05_23, deployment Perimeter, malware_family Kraken_Stealer, performance_impact Low, confidence High, signature_severity Major, updated_at 2023_05_23;
    target:src_ip;
)

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