ET MALWARE Win32/nstealer CnC Exfiltration (POST) M2

Query · suricata

flow:established,to_server;
http.method;
content:"POST";
http.request_body;
content:"filename|3d 22|US|5b|";
pcre:"/^(?:[0-9A-Z]{32})/R";
content:"|2e|zip|22 0d 0a|";
content:"|0d 0a 0d 0a 50 4b|";
content:"filename|3d 22|US|5b|";
pcre:"/^(?:[0-9A-Z]{32})/R";
content:"|2f|Autofills|2f 50 4b|"; fast_pattern;
content:"|2f|InstalledSoftware|2e|txt";
Raw source ET MALWARE Win32/nstealer CnC Exfiltration (POST) M2 · 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/nstealer CnC Exfiltration (POST) M2";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.request_body;
    content:"filename|3d 22|US|5b|";
    pcre:"/^(?:[0-9A-Z]{32})/R";
    content:"|2e|zip|22 0d 0a|";
    content:"|0d 0a 0d 0a 50 4b|";
    content:"filename|3d 22|US|5b|";
    pcre:"/^(?:[0-9A-Z]{32})/R";
    content:"|2f|Autofills|2f 50 4b|"; fast_pattern;
    content:"|2f|InstalledSoftware|2e|txt";
    reference:md5,7a2bcc01232927019008d880a4c71426;
    reference:url,community.emergingthreats.net/t/nstealer-v2/974;
    classtype:trojan-activity;
    sid:2048230; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_09_25, deployment Perimeter, deployment SSLDecrypt, malware_family Nstealer, confidence High, signature_severity Critical, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_09_25, reviewed_at 2023_09_25;
)

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