ET MALWARE Sofacy Request Outbound

Query · suricata

flow:established,to_server;
http.uri;
content:"/?";
content:"&ai="; fast_pattern;
content:!"&adurl=";
pcre:"/^\/[a-z]+?\/\?(?:[a-z]+?=[A-Za-z0-9\x5f\x2d]+&){1,}ai=[^&]{5}(?:[A-Za-z0-9\x5f\x2d]{4})*(?:[A-Za-z0-9\x5f\x2d]{2}==|[A-Za-z0-9\x5f\x2d]{3}=|[A-Za-z0-9\x5f\x2d]{4})(?:&|$)/";
http.user_agent;
content:"Windows NT";
http.header_names;
content:!"Referer";
Raw source ET MALWARE Sofacy Request Outbound · Suricata
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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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE Sofacy Request Outbound";
    flow:established,to_server;
    http.uri;
    content:"/?";
    content:"&ai="; fast_pattern;
    content:!"&adurl=";
    pcre:"/^\/[a-z]+?\/\?(?:[a-z]+?=[A-Za-z0-9\x5f\x2d]+&){1,}ai=[^&]{5}(?:[A-Za-z0-9\x5f\x2d]{4})*(?:[A-Za-z0-9\x5f\x2d]{2}==|[A-Za-z0-9\x5f\x2d]{3}=|[A-Za-z0-9\x5f\x2d]{4})(?:&|$)/";
    http.user_agent;
    content:"Windows NT";
    http.header_names;
    content:!"Referer";
    classtype:targeted-activity;
    sid:2019545; rev:1238;
    metadata:created_at 2014_10_29, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_10_09;
)

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