splApache-2.0from splunk/security_content

Recon Using WMI Class

The following analytic detects suspicious PowerShell activity via EventCode 4104, where WMI performs event queries to gather information on running processes or services. This detection leverages PowerShell Script Block Logging to identify specific WMI queries targeting system information classes like Win32_Bios and Win32_OperatingSystem. This activity is significant as it often indicates reconnaissance efforts by an adversary to profile the compromised machine. If confirmed malicious, the attacker could gain detailed system information, aiding in further exploitation or lateral movement within the network.

Quality

FP risk

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Forks

Views

Rule sourcedetections/endpoint/recon_using_wmi_class.yml

`powershell` EventCode=4104 AND ScriptBlockText IN ("*SELECT*", "*Get-WmiObject*") AND ScriptBlockText IN ("*Win32_Bios*", "*Win32_OperatingSystem*", "*Win32_Processor*", "*Win32_ComputerSystem*", "*Win32_PnPEntity*", "*Win32_ShadowCopy*", "*Win32_DiskDrive*", "*Win32_PhysicalMemory*", "*Win32_BaseBoard*", "*Win32_DisplayConfiguration*")
  | fillnull
  | stats count min(_time) as firstTime max(_time) as lastTime
    BY dest signature signature_id
       user_id vendor_product EventID
       Guid Opcode Name
       Path ProcessID ScriptBlockId
       ScriptBlockText
  | `security_content_ctime(firstTime)`
  | `security_content_ctime(lastTime)`
  | `recon_using_wmi_class_filter`