ET INFO Psiphon VPN Related Activity (POST)

Query · suricata

flow:established,to_server;
http.method;
content:"POST";
http.uri;
content:"/"; bsize:1;
http.header_names;
content:"|0d 0a|Content-Length|0d 0a|Content-Type|0d 0a|Cookie|0d 0a|Accept-Encoding|0d 0a 0d 0a|"; fast_pattern;
content:!"Referer";
http.content_type;
content:"application/octet-stream"; bsize:24;
http.cookie;
pcre:"/^[A-Z]=[A-Za-z/+0-9=]{200,400}$/";
Raw source ET INFO Psiphon VPN Related Activity (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 -> $EXTERNAL_NET any (
    msg:"ET INFO Psiphon VPN Related Activity (POST)";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:"/"; bsize:1;
    http.header_names;
    content:"|0d 0a|Content-Length|0d 0a|Content-Type|0d 0a|Cookie|0d 0a|Accept-Encoding|0d 0a 0d 0a|"; fast_pattern;
    content:!"Referer";
    http.content_type;
    content:"application/octet-stream"; bsize:24;
    http.cookie;
    pcre:"/^[A-Z]=[A-Za-z/+0-9=]{200,400}$/";
    reference:md5,912e361d280d881980caca25cd0b80d4;
    classtype:bad-unknown;
    sid:2037033; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2022_06_17, deployment Perimeter, performance_impact Moderate, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_06_17;
)

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