ET SCAN ICMP @hello request Likely Precursor to Scan

Query · suricata

itype:8;
icode:0;
content:"@hello ???";
Raw source ET SCAN ICMP @hello request Likely Precursor to Scan · 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 icmp $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET SCAN ICMP @hello request Likely Precursor to Scan";
    itype:8;
    icode:0;
    content:"@hello ???";
    classtype:misc-activity;
    sid:2010641; rev:3;
    metadata:created_at 2010_07_30, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;
)

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