ET MALWARE Win32/Umbral-Stealer CnC Exfil via Discord (POST)

Query · suricata

flow:established,to_server;
http.method;
content:"POST";
http.host;
content:"discord.com"; endswith;
http.request_body;
content:"|7b 22|title|22 3a 22|Umbral|20|Stealer|22 2c 22|description|22 3a 22|"; fast_pattern;
content:"|22 2a 2a 5f 5f|System|20|Info|5f 5f 2a 2a 5c|r|5c|n";
content:"|5c|r|5c|n|5c|r|5c|n|2a 2a 5f 5f|Grabbed|20|Data|5f 5f 2a 2a 5c|r|5c|n|60 60 60|";
Raw source ET MALWARE Win32/Umbral-Stealer CnC Exfil via Discord (POST) · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Win32/Umbral-Stealer CnC Exfil via Discord (POST)";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.host;
    content:"discord.com"; endswith;
    http.request_body;
    content:"|7b 22|title|22 3a 22|Umbral|20|Stealer|22 2c 22|description|22 3a 22|"; fast_pattern;
    content:"|22 2a 2a 5f 5f|System|20|Info|5f 5f 2a 2a 5c|r|5c|n";
    content:"|5c|r|5c|n|5c|r|5c|n|2a 2a 5f 5f|Grabbed|20|Data|5f 5f 2a 2a 5c|r|5c|n|60 60 60|";
    reference:url,twitter.com/suyog41/status/1654108795881005057;
    reference:url,github.com/Blank-c/Umbral-Stealer;
    classtype:trojan-activity;
    sid:2045593; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_05_04, deployment Perimeter, deployment SSLDecrypt, malware_family UmbralStealer, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_05_04;
)

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