ET MALWARE MaskGramStealer Host Profile Exfil (POST)

Query · suricata

flow:established,to_server;
http.method;
content:"POST";
http.user_agent; bsize:10;
content:"Client/1.0";
http.header_names;
content:"|0d 0a|x-filename|0d 0a|x-browser-type|0d 0a|x-profile-name|0d 0a|"; nocase; fast_pattern;
target:src_ip;
Raw source ET MALWARE MaskGramStealer Host Profile Exfil (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 MaskGramStealer Host Profile Exfil (POST)";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.user_agent; bsize:10;
    content:"Client/1.0";
    http.header_names;
    content:"|0d 0a|x-filename|0d 0a|x-browser-type|0d 0a|x-profile-name|0d 0a|"; nocase; fast_pattern;
    reference:md5,25041e230c55fd46e5ef52ab02b3bc6c;
    classtype:command-and-control;
    sid:2066625; rev:2;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2026_01_08, deployment Perimeter, deployment SSLDecrypt, malware_family MaskGramStealer, confidence High, signature_severity Critical, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2026_05_05, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;
    target:src_ip;
)

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