ET MALWARE Win32/Vidar Variant/Mars Stealer CnC Exfil

Query · suricata

flow:established,to_server;
http.method;
content:"POST";
http.uri;
content:".php"; endswith;
http.request_body;
content:"Content-Disposition|3a 20|form-data|3b 20|name=|22|file|22 0d 0a 0d 0a|";
content:".zip|0d 0a|"; distance:0; within:50;
content:"|0d 0a|PK"; distance:0;
content:"system.txt"; distance:0; fast_pattern;
http.header_names;
content:!"Referer";
content:!"User-Agent";
Raw source ET MALWARE Win32/Vidar Variant/Mars Stealer CnC Exfil · 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/Vidar Variant/Mars Stealer CnC Exfil";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:".php"; endswith;
    http.request_body;
    content:"Content-Disposition|3a 20|form-data|3b 20|name=|22|file|22 0d 0a 0d 0a|";
    content:".zip|0d 0a|"; distance:0; within:50;
    content:"|0d 0a|PK"; distance:0;
    content:"system.txt"; distance:0; fast_pattern;
    http.header_names;
    content:!"Referer";
    content:!"User-Agent";
    reference:md5,8124a572f854007e63cc7337547a37af;
    reference:md5,673410a381f324b0209abf1175415206;
    reference:url,3xp0rt.com/posts/mars-stealer;
    classtype:trojan-activity;
    sid:2033163; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_06_23, deployment Perimeter, malware_family Win32_Vidar, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_06_23;
)

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