ET INFO SOCKSv5 Port 25 Inbound Request (Linux Source)

Query · suricata

dsize:10;
flow:established,to_server;
content:"|05 01 00 01|"; depth:4;
content:"|00 19|"; offset:8; depth:2;
threshold:type both, track by_src, count 1, seconds 900;
Raw source ET INFO SOCKSv5 Port 25 Inbound Request (Linux Source) · 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 tcp $EXTERNAL_NET 32768:61000 -> $HOME_NET 1024:65535 (
    msg:"ET INFO SOCKSv5 Port 25 Inbound Request (Linux Source)";
    dsize:10;
    flow:established,to_server;
    content:"|05 01 00 01|"; depth:4;
    content:"|00 19|"; offset:8; depth:2;
    threshold:type both, track by_src, count 1, seconds 900;
    reference:url,handlers.sans.org/wsalusky/rants/;
    reference:url,en.wikipedia.org/wiki/SOCKS;
    reference:url,ss5.sourceforge.net/socks4.protocol.txt;
    reference:url,ss5.sourceforge.net/socks4A.protocol.txt;
    reference:url,www.ietf.org/rfc/rfc1928.txt;
    reference:url,www.ietf.org/rfc/rfc1929.txt;
    reference:url,www.ietf.org/rfc/rfc1961.txt;
    reference:url,www.ietf.org/rfc/rfc3089.txt;
    classtype:protocol-command-decode;
    sid:2003255; rev:6;
    metadata:created_at 2010_07_30, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;
)

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