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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.*

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: 4

Rule authors:

Elastic

Rule license: Elastic License v2

Rule query

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event.category:process and host.os.type:windows and
  powershell.file.script_block_text : (
    (
      ("Get-ItemProperty" or "Get-Item") and "-Path"
    ) or
    (
      "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 user.id : ("S-1-5-18" or "S-1-5-19" or "S-1-5-20") and
  not file.path : (
        ?\:\\\\Program?Files\\\\WindowsPowerShell\\\\Modules\\\\*.psd1 or
        ?\:\\\\Program?Files\\\\WindowsPowerShell\\\\Modules\\\\*.psm1 or
        ?\:\\\\Program?Files\\\\Microsoft?Azure?AD?Sync\\\\Extensions\\\\AADConnector.psm1* or
        *ServiceNow?MID?Server*agent\\\\scripts\\\\PowerShell\\\\*.psm1 or
        ?\:\\\\*\\\\IMECache\\\\HealthScripts\\\\*\\\\detect.ps1
      ) and
  not (
    file.path : (
      ?\:\\\\*\\\\TEMP\\\\SDIAG* or
      ?\:\\\\TEMP\\\\SDIAG* or
      ?\:\\\\Temp\\\\SDIAG* or
      ?\:\\\\temp\\\\SDIAG* or
      ?\:\\\\Users\\\\*\\\\AppData\\\\Local\\\\Temp\\\\SDIAG* or
      ?\:\\\\Users\\\\*\\\\AppData\\\\Local\\\\Temp\\\\*\\\\SDIAG*
    ) and file.name : "CL_Utility.ps1"
  )

Framework: MITRE ATT&CK^TM

Tactic:
- Name: Discovery
- ID: TA0007
- Reference URL: https://attack.mitre.org/tactics/TA0007/
Technique:
- Name: Account Discovery
- ID: T1087
- Reference URL: https://attack.mitre.org/techniques/T1087/
Sub-technique:
- Name: Local Account
- ID: T1087.001
- Reference URL: https://attack.mitre.org/techniques/T1087/001/
Sub-technique:
- Name: Domain Account
- ID: T1087.002
- Reference URL: https://attack.mitre.org/techniques/T1087/002/
Technique:
- Name: Domain Trust Discovery
- ID: T1482
- Reference URL: https://attack.mitre.org/techniques/T1482/
Technique:
- Name: System Information Discovery
- ID: T1082
- Reference URL: https://attack.mitre.org/techniques/T1082/
Technique:
- Name: File and Directory Discovery
- ID: T1083
- Reference URL: https://attack.mitre.org/techniques/T1083/
Technique:
- Name: Group Policy Discovery
- ID: T1615
- Reference URL: https://attack.mitre.org/techniques/T1615/
Technique:
- Name: Network Share Discovery
- ID: T1135
- Reference URL: https://attack.mitre.org/techniques/T1135/
Technique:
- Name: Password Policy Discovery
- ID: T1201
- Reference URL: https://attack.mitre.org/techniques/T1201/
Technique:
- Name: Process Discovery
- ID: T1057
- Reference URL: https://attack.mitre.org/techniques/T1057/
Technique:
- Name: Software Discovery
- ID: T1518
- Reference URL: https://attack.mitre.org/techniques/T1518/
Sub-technique:
- Name: Security Software Discovery
- ID: T1518.001
- Reference URL: https://attack.mitre.org/techniques/T1518/001/
Technique:
- Name: Query Registry
- ID: T1012
- Reference URL: https://attack.mitre.org/techniques/T1012/
Technique:
- Name: System Information Discovery
- ID: T1082
- Reference URL: https://attack.mitre.org/techniques/T1082/
Technique:
- Name: System Network Connections Discovery
- ID: T1049
- Reference URL: https://attack.mitre.org/techniques/T1049/
Technique:
- Name: System Service Discovery
- ID: T1007
- Reference URL: https://attack.mitre.org/techniques/T1007/
Tactic:
- Name: Execution
- ID: TA0002
- Reference URL: https://attack.mitre.org/tactics/TA0002/
Technique:
- Name: Command and Scripting Interpreter
- ID: T1059
- Reference URL: https://attack.mitre.org/techniques/T1059/
Sub-technique:
- Name: PowerShell
- ID: T1059.001
- Reference URL: https://attack.mitre.org/techniques/T1059/001/

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