ET VOIP H.323 in Q.931 Call Setup - Inbound

Query · suricata

flow:to_server,established;
content:"|08|"; offset:4; depth:1;
byte_jump:1,0,relative;
content:"|05 04|"; within:2;
byte_jump:1,0,relative;
content:"|70|";
byte_jump:1,0,relative;
content:"|7E|"; within:1;
byte_test:1,!&,0x0F,3,relative;
isdataat:31;
Raw source ET VOIP H.323 in Q.931 Call Setup - Inbound · 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 any -> $HOME_NET 1720 (
    msg:"ET VOIP H.323 in Q.931 Call Setup - Inbound";
    flow:to_server,established;
    content:"|08|"; offset:4; depth:1;
    byte_jump:1,0,relative;
    content:"|05 04|"; within:2;
    byte_jump:1,0,relative;
    content:"|70|";
    byte_jump:1,0,relative;
    content:"|7E|"; within:1;
    byte_test:1,!&,0x0F,3,relative;
    isdataat:31;
    classtype:misc-activity;
    sid:2022024; rev:1;
    metadata:created_at 2015_11_03, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;
)

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