ET MALWARE Win32/Stealc Submitting Screenshot to C2

Query · suricata

flow:established,to_server;
http.method;
content:"POST";
http.uri;
content:".php"; endswith;
http.request_body;
content:"form-data|3b 20|name=|22|token|22|";
content:"form-data|3b 20|name=|22|file|22 0d 0a 0d 0a|"; fast_pattern; distance:0;
base64_decode:offset 0,relative;
base64_data;
content:"|ff d8 ff|"; startswith;
content:"JFIF"; distance:3; within:4;
Raw source ET MALWARE Win32/Stealc Submitting Screenshot to C2 · 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/Stealc Submitting Screenshot to C2";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:".php"; endswith;
    http.request_body;
    content:"form-data|3b 20|name=|22|token|22|";
    content:"form-data|3b 20|name=|22|file|22 0d 0a 0d 0a|"; fast_pattern; distance:0;
    base64_decode:offset 0,relative;
    base64_data;
    content:"|ff d8 ff|"; startswith;
    content:"JFIF"; distance:3; within:4;
    reference:url,blog.sekoia.io/stealc-a-copycat-of-vidar-and-raccoon-infostealers-gaining-in-popularity-part-1/;
    classtype:command-and-control;
    sid:2044249; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_02_20, deployment Perimeter, malware_family Stealc, confidence High, signature_severity Major, tag Stealer, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_02_20;
)

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