Device Sshtrafficonnonstandardport

KQL detection rule by reprise99 · MIT

Detect SSH traffic that isn't on port 22 connecting to public IP addresses

//Detect SSH traffic that isn't on port 22 connecting to public IP addresses

//Data connector required for this query - M365 Defender - Device* tables

//Microosft Sentinel query
DeviceNetworkEvents
| where ActionType == "NetworkSignatureInspected"
| extend AF = parse_json(AdditionalFields)
| extend NetworkSignature = AF.SignatureName
//Search for network signatures that are SSH but not on port 22
| where NetworkSignature == "SSH" and RemotePort != 22
//Exclude traffic where the remote IP is a private/local IP address, you can remove this if also interested in that traffic
| where not(ipv4_is_private(RemoteIP))
//Exclude traffic where the remote IP is a Link Local address
| where not(ipv4_is_match(RemoteIP,'169.0.0.0/8')) | project
    TimeGenerated,
    DeviceName,
    NetworkSignature,
    LocalIP,
    LocalPort,
    RemoteIP,
    RemotePort,
    RemoteUrl

//Advanced Hunting query

//Data connector required for this query - Advanced Hunting license

DeviceNetworkEvents
| where ActionType == "NetworkSignatureInspected"
| extend AF = parse_json(AdditionalFields)
| extend NetworkSignature = AF.SignatureName
//Search for network signatures that are SSH but not on port 22
| where NetworkSignature == "SSH" and RemotePort != 22
//Exclude traffic where the remote IP is a private/local IP address, you can remove this if also interested in that traffic
| where not(ipv4_is_private(RemoteIP))
//Exclude traffic where the remote IP is a Link Local address
| where not(ipv4_is_match(RemoteIP,'169.0.0.0/8')) 
| project
    Timestamp,
    DeviceName,
    NetworkSignature,
    LocalIP,
    LocalPort,
    RemoteIP,
    RemotePort,
    RemoteUrl

[[ currentRule.title && currentRule.title.length > 60 ? currentRule.title.slice(0, 60) + '…' : currentRule.title ]]

27ccb0c0-6d61-4a03-9083-5b101fe3c8be

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Executable code, not a declarative rule

This submission is arbitrary [[ currentRule.format ? currentRule.format.toUpperCase() : '' ]] code, not a declarative detection rule — review it as you would any script before running it, and note that it cannot be safely aggregated or auto-executed alongside YARA/Sigma/Suricata/CRS rules.

Rejected pattern present

[[ reason ]]

What does this mean?

Format & documentation suggestions

Not a security issue — this rule is valid and was accepted as-is. These are optional fields/conventions its own format recommends, mainly affecting its quality score and how well it documents itself for other reviewers.

[[ reason ]]

What do these messages mean?

[[ currentRule.title && currentRule.title.length > 60 ? currentRule.title.slice(0, 60) + '…' : currentRule.title ]]

[[ currentRule.title ]]

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