Elastic medium stable kql

Azure Compute VM Command Executed

Identifies synchronous command execution on a virtual machine (VM) or virtual machine scale set (VMSS) in Azure via the action-based Run Command ("runCommand/action"). A Virtual Machine Contributor role lets you manage virtual machines, but not access them, nor access the virtual network or storage account they’re connected to. However, commands can be run on the VM via the Run Command feature, which execute as System (Windows) or root (Linux). Other roles, such as certain Administrator roles, may be able to execute commands on a VM as well.

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Detection Logic

data_stream.dataset:azure.activitylogs and
    azure.activitylogs.operation_name:(
        "MICROSOFT.COMPUTE/VIRTUALMACHINES/RUNCOMMAND/ACTION" or
        "MICROSOFT.COMPUTE/VIRTUALMACHINESCALESETS/VIRTUALMACHINES/RUNCOMMAND/ACTION"
    ) and event.outcome:(Success or success) and
    azure.activitylogs.identity.authorization.evidence.principal_id: * and
    source.as.number: * and
    azure.resource.name: *

False Positives

⚠ Command execution on a virtual machine may be done by a system or network administrator. Verify whether the username, hostname, and/or resource name should be making changes in your environment. Command execution from unfamiliar users or hosts should be investigated. If known behavior is causing false positives, it can be exempted from the rule.

Field Validations

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