ET MALWARE Marco Stealer Data Exfiltration Attempt

Query · suricata

flow:established,to_server;
http.method;
content:"POST";
http.uri; bsize:8;
content:"/receive";
http.user_agent; bsize:10;
content:"DataSenter"; fast_pattern;
http.header_names;
content:!"|0d 0a|referer|0d 0a|";
http.request_body;
content:"data|3d|"; startswith;
pcre:"/^[a-f0-9]{10,}/R";
target:src_ip;
Raw source ET MALWARE Marco Stealer 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 http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Marco Stealer Data Exfiltration Attempt";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri; bsize:8;
    content:"/receive";
    http.user_agent; bsize:10;
    content:"DataSenter"; fast_pattern;
    http.header_names;
    content:!"|0d 0a|referer|0d 0a|";
    http.request_body;
    content:"data|3d|"; startswith;
    pcre:"/^[a-f0-9]{10,}/R";
    reference:url,www.zscaler.com/blogs/security-research/technical-analysis-marco-stealer;
    classtype:trojan-activity;
    sid:2067367; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_11, attack_target Client_Endpoint, tls_state plaintext, created_at 2026_02_06, deployment Perimeter, malware_family Stealer, malware_family MarcoStealer, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2026_02_06, mitre_tactic_id TA0009, mitre_tactic_name Collection, mitre_technique_id T1005, mitre_technique_name Data_from_local_system;
    target:src_ip;
)

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