IMPORTANT: No additional bug fixes or documentation updates will be released for this version. For the latest information, see the current release documentation.
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Elastic Docs ›Elastic Security Solution [8.13] ›Detections and alerts ›Prebuilt rule reference

PowerShell Script with Discovery Capabilities

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PowerShell Script with Discovery Capabilities

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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.

Rule type: query

Rule indices:

  • winlogbeat-*
  • logs-windows.powershell*

Severity: low

Risk score: 21

Runs every: 60m

Searches indices from: now-119m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References: None

Tags:

  • Domain: Endpoint
  • OS: Windows
  • Use Case: Threat Detection
  • Tactic: Collection
  • Tactic: Discovery
  • Data Source: PowerShell Logs
  • Rule Type: BBR

Version: 109

Rule authors:

  • Elastic

Rule license: Elastic License v2

Setup

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Setup

The PowerShell Script Block Logging logging policy must be enabled. Steps to implement the logging policy with Advanced Audit Configuration:

Computer Configuration >
Administrative Templates >
Windows PowerShell >
Turn on PowerShell Script Block Logging (Enable)

Steps to implement the logging policy via registry:

reg add "hklm\SOFTWARE\Policies\Microsoft\Windows\PowerShell\ScriptBlockLogging" /v EnableScriptBlockLogging /t REG_DWORD /d 1

Rule query

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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]" or "[WMI]") 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\","
  ) and
  not user.id : ("S-1-5-18" or "S-1-5-19" or "S-1-5-20")

Framework: MITRE ATT&CKTM

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