ET MALWARE Filch Stealer CnC Checkin

Query · suricata

flow:established, to_server;
content:"|7c|Intel|28|R|29|"; fast_pattern;
pcre:"/\x7c.{6,}\x7c/";
content:"|20|GB|7c|";
content:"|7c|Windows|20|";
pcre:"/^1[01]/R";
target:src_ip;
Raw source ET MALWARE Filch Stealer CnC Checkin · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert tcp-pkt $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Filch Stealer CnC Checkin";
    flow:established, to_server;
    content:"|7c|Intel|28|R|29|"; fast_pattern;
    pcre:"/\x7c.{6,}\x7c/";
    content:"|20|GB|7c|";
    content:"|7c|Windows|20|";
    pcre:"/^1[01]/R";
    reference:url,www.rapid7.com/blog/post/filch-stealer-a-new-infostealer-leveraging-old-techniques/;
    reference:md5,5e13fd50160acfc9c40de6c3b0f43c11;
    classtype:trojan-activity;
    sid:2064802; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_11, attack_target Client_Endpoint, created_at 2025_09_19, deployment Perimeter, malware_family Stealer, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_09_19, 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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