Elastic low stable kql

Deprecated - PowerShell Script with Discovery Capabilities

Identifies the use of Cmdlets and methods related to discovery activities. Attackers can use these to perform various situational awareness related activities, like enumerating users, shares, sessions, domain trusts, groups, etc.

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Detection Logic

event.category:process and host.os.type:windows and
  powershell.file.script_block_text : (
    (
      "Get-ADDefaultDomainPasswordPolicy" or
      "Get-ADDomain" or "Get-ComputerInfo" or
      "Get-Disk" or "Get-DnsClientCache" or
      "Get-GPOReport" or "Get-HotFix" or
      "Get-LocalUser" or "Get-NetFirewallProfile" or
      "get-nettcpconnection" or "Get-NetAdapter" or
      "Get-PhysicalDisk" or "Get-Process" or
      "Get-PSDrive" or "Get-Service" or
      "Get-SmbShare" or "Get-WinEvent"
    ) or
    (
      ("Get-WmiObject" or "gwmi" or "Get-CimInstance" or
       "gcim" or "Management.ManagementObjectSearcher" or
       "System.Management.ManagementClass" or
       "[WmiClass]") and
      (
        "AntiVirusProduct" or "CIM_BIOSElement" or "CIM_ComputerSystem" or "CIM_Product" or "CIM_DiskDrive" or
        "CIM_LogicalDisk" or "CIM_NetworkAdapter" or "CIM_StorageVolume" or "CIM_OperatingSystem" or
        "CIM_Process" or "CIM_Service" or "MSFT_DNSClientCache" or "Win32_BIOS" or "Win32_ComputerSystem" or
        "Win32_ComputerSystemProduct" or "Win32_DiskDrive" or "win32_environment" or "Win32_Group" or
        "Win32_groupuser" or "Win32_IP4RouteTable" or "Win32_logicaldisk" or "Win32_MappedLogicalDisk" or
        "Win32_NetworkAdapterConfiguration" or "win32_ntdomain" or "Win32_OperatingSystem" or
        "Win32_PnPEntity" or "Win32_Process" or "Win32_Product" or "Win32_quickfixengineering" or
        "win32_service" or "Win32_Share" or "Win32_UserAccount"
      )
    ) or
    (
      ("ADSI" and "WinNT") or
      ("Get-ChildItem" and "sysmondrv.sys") or
      ("::GetIPGlobalProperties()" and "GetActiveTcpConnections()") or
      ("ServiceProcess.ServiceController" and "::GetServices") or
      ("Diagnostics.Process" and "::GetProcesses") or
      ("DirectoryServices.Protocols.GroupPolicy" and ".GetGPOReport()") or
      ("DirectoryServices.AccountManagement" and "PrincipalSearcher") or
      ("NetFwTypeLib.NetFwMgr" and "CurrentProfile") or
      ("NetworkInformation.NetworkInterface" and "GetAllNetworkInterfaces") or
      ("Automation.PSDriveInfo") or
      ("Microsoft.Win32.RegistryHive")
    ) or
    (
      "Get-ItemProperty" and
      (
        "\Control\SecurityProviders\WDigest" or
        "\microsoft\windows\currentversion\explorer\runmru" or
        "\Microsoft\Windows\CurrentVersion\Policies\System\Kerberos\Parameters" or
        "\Microsoft\Windows\CurrentVersion\Uninstall" or
        "\Microsoft\Windows\WindowsUpdate" or
        "Policies\Microsoft\Windows\Installer" or
        "Software\Microsoft\Windows\CurrentVersion\Policies" or
        ("\Services\SharedAccess\Parameters\FirewallPolicy" and "EnableFirewall") or
        ("Microsoft\Windows\CurrentVersion\Internet Settings" and "proxyEnable")
      )
    ) or
    (
      ("Directoryservices.Activedirectory" or
      "DirectoryServices.AccountManagement") and 
      (
        "Domain Admins" or "DomainControllers" or
        "FindAllGlobalCatalogs" or "GetAllTrustRelationships" or
        "GetCurrentDomain" or "GetCurrentForest"
      ) or
      "DirectoryServices.DirectorySearcher" and
      (
        "samAccountType=805306368" or
        "samAccountType=805306369" or
        "objectCategory=group" or
        "objectCategory=groupPolicyContainer" or
        "objectCategory=site" or
        "objectCategory=subnet" or
        "objectClass=trustedDomain"
      )
    ) or
    (
      "Get-Process" and
      (
        "mcshield" or "windefend" or "savservice" or
        "TMCCSF" or "symantec antivirus" or
        "CSFalcon" or "TmPfw" or "kvoop"
      )
    )
  ) and
  not powershell.file.script_block_text : (
    (
      "__cmdletization_BindCommonParameters" and
      "Microsoft.PowerShell.Core\Export-ModuleMember" and
      "Microsoft.PowerShell.Cmdletization.Cim.CimCmdletAdapter"
    ) or
    "CmdletsToExport=@(\"Add-Content\"," or
    ("cmdletization" and "cdxml-Help.xml")
  ) and
  not user.id : ("S-1-5-18" or "S-1-5-19" or "S-1-5-20")

Field Validations

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