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Microsoft-365-Defender-Hunt.../General queries/Device Count by DNS Suffix.md

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Device Count by DNS Suffix

This query will count the number of devices in Defender ATP based on their DNS suffix. For a full list of devices with the DNS suffix, comment out or remove the last line.

Query

DeviceInfo
| where isnotempty(OSPlatform)
| summarize arg_max(Timestamp, DeviceName) by DeviceId
| extend DeviceMachineName = split(DeviceName, '.')[0]
| extend DeviceDomain = substring(DeviceName, strlen(DeviceMachineName) + 1, strlen(DeviceName) - strlen(DeviceMachineName) - 1)
| summarize count() by DeviceDomain

Category

This query can be used to detect the following attack techniques and tactics (see MITRE ATT&CK framework) or security configuration states.

Technique, tactic, or state Covered? (v=yes) Notes
Initial access
Execution
Persistence
Privilege escalation
Defense evasion
Credential Access
Discovery
Lateral movement
Collection
Command and control
Exfiltration
Impact
Vulnerability
Misconfiguration
Malware, component

Contributor info

Contributor: Michael Melone

GitHub alias: mjmelone

Organization: Microsoft

Contact info: @PowershellPoet