ET MALWARE Win32/ViperSoftX Stealer Activity M3 (POST)

Query · suricata

flow:established,to_server;
http.request_line;
content:"POST /connect HTTP/1.1";
http.header;
content:"X-User-Agent|3a 20|"; fast_pattern;
pcre:"/^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})\r\n/R";
http.header_names;
content:"|0d 0a|X-User-Agent|0d 0a|Host|0d 0a|Content-Length|0d 0a|Connection|0d 0a 0d 0a|"; bsize:52;
target:src_ip;
Raw source ET MALWARE Win32/ViperSoftX Stealer Activity M3 (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 Win32/ViperSoftX Stealer Activity M3 (POST)";
    flow:established,to_server;
    http.request_line;
    content:"POST /connect HTTP/1.1";
    http.header;
    content:"X-User-Agent|3a 20|"; fast_pattern;
    pcre:"/^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})\r\n/R";
    http.header_names;
    content:"|0d 0a|X-User-Agent|0d 0a|Host|0d 0a|Content-Length|0d 0a|Connection|0d 0a 0d 0a|"; bsize:52;
    reference:url,decoded.avast.io/janrubin/vipersoftx-hiding-in-system-logs-and-spreading-venomsoftx/;
    reference:md5,d8f4fde20adbf45cff5c5413ef4b855d;
    classtype:trojan-activity;
    sid:2040139; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2022_11_28, deployment Perimeter, malware_family ViperSoftX, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_11_28;
    target:src_ip;
)

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