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RECON-7

Description

Enumerate SCCM site information via local files

MITRE ATT&CK TTPs

Requirements

  • Valid Active Directory domain credentials

Summary

Upon the enrollment of a client to SCCM, default directories are created where SCCM client specific debugging logs can be stored. The log files contain details about deployments, hostnames related to SCCM servers, and other relevant information.

These log files can be enumerated simply by using the command and control file browser. Default defensive telemetry isn't usually generated upon the access of these SCCM log directories unless custom auditing is enabled.

Log files located on the SCCM-enrolled clients will typically originate from the following directories:

  • C:\Windows\CCM\Logs
  • C:\Windows\ccmcache
  • C:\Windows\ccmsetup

The C:\Windows\CCM\Logs directory is one of the most useful from an enumeration perspective, as it contains the SCCM server names in multiple logs:

  • C:\Windows\CCM\Logs\StatusAgent.log
  • C:\Windows\CCM\Logs\LocationServices.log
  • C:\Windows\CCM\Logs\DataTransferService.log
  • C:\Windows\CCM\Logs\ClientServicing.log
  • C:\Windows\CCM\Logs\CcmNotificationAgent.log
  • C:\Windows\CCM\Logs\CcmMessaging.log
  • C:\Windows\CCM\Logs\CcmEval.log

Additionally, the registry key/value of HKLM:\SOFTWARE\Microsoft\SMS\DP\ManagementPoints will enumerate the Distribution Points and Management Points for that particular SCCM-enrolled client. Defenders will typically have some default auditing aimed at accessing the registry.

Impact

  1. Profiling site servers is a supplementary step in building potential attack paths
  2. A resolved DP role can be a target for PXE abuse to recover domain credentials detailed in CRED-1
  3. A resolved DP role can be a target for sensitive information hunting in the Content Library
  4. A resolved MP role can be a target for spoofing client enrollment CRED-2
  5. A resolved MP site system role can be used to elevate privileges via credential relay attacks ELEVATE-1

Defensive IDs

Examples

Use SharpSCCM to enumerate local SCCM log files containing UNC paths:

SCCM-Enrolled Client

.\SharpSCCM.exe local triage

  _______ _     _ _______  ______  _____  _______ _______ _______ _______
  |______ |_____| |_____| |_____/ |_____] |______ |       |       |  |  |
  ______| |     | |     | |    \_ |       ______| |______ |______ |  |  |    @_Mayyhem

[+] Client cache contents and permissions for the current user:
    Perms      Size  Date modified          Name
      drw             8/31/2024 1:51:07 AM  C:\Windows\ccmcache
      -rw      0.0B   8/31/2024 1:51:07 AM  C:\Windows\ccmcache\skpswi.dat

[+] Searching logs for possible UNC paths:
    Found match in C:\Windows\CCM\Logs\InventoryAgent-20241019-033813.log
      \\localhost\root\cimv2
      \\localhost\root\vm\VirtualServer
      \\localhost\root\vm\VirtualServer Namespace
      \\localhost\root\Microsoft\appvirt\client
      \\localhost\root\Microsoft\appvirt\client Namespace
    Found match in C:\Windows\CCM\Logs\InventoryAgent.log
      \\localhost\root\cimv2
      \\localhost\root\vm\VirtualServer
      \\localhost\root\vm\VirtualServer Namespace

[+] Searching logs for possible URLs:
    Found match in C:\Windows\CCM\Logs\CcmEval-20241020-204501.log
      http://atlas.aperture.local
    Found match in C:\Windows\CCM\Logs\CcmEval.log
      http://atlas.aperture.local
    Found match in C:\Windows\CCM\Logs\CcmMessaging-20241020-062929.log
      http://atlas.aperture.local/CCM_Incoming/
      http://atlas.aperture.local:80/CCM_Incoming/
    Found match in C:\Windows\CCM\Logs\CcmMessaging.log
      http://atlas.aperture.local/CCM_Incoming/
      http://atlas.aperture.local:80/CCM_Incoming/
    Found match in C:\Windows\CCM\Logs\ClientLocation.log
      http://atlas.aperture.local
    Found match in C:\Windows\CCM\Logs\ClientServicing.log
      http://atlas.aperture.local
      http://atlas.aperture.local/CCM_Client
    Found match in C:\Windows\CCM\Logs\DataTransferService.log
      http://atlas.aperture.local/SMS_MP
      http://atlas.aperture.local:80/SMS_MP
    Found match in C:\Windows\CCM\Logs\DeltaDownload-20241012-184715.log
      http://localhost:8005
    Found match in C:\Windows\CCM\Logs\DeltaDownload.log
      http://localhost:8005
    Found match in C:\Windows\CCM\Logs\SensorEndpoint-20241023-173719.log
      http://www.w3.org/2001/XMLSchema
      http://www.w3.org/2001/XMLSchema-instance
      http://schemas.microsoft.com/win/2004/08/events/event
    Found match in C:\Windows\CCM\Logs\SensorEndpoint.log
      http://www.w3.org/2001/XMLSchema
      http://www.w3.org/2001/XMLSchema-instance
      http://schemas.microsoft.com/win/2004/08/events/event
    Found match in C:\Windows\CCM\Logs\SensorManagedProvider-20241024-144230.Log
      http://www.w3.org/2001/XMLSchema-instance
      http://www.w3.org/2001/XMLSchema
    Found match in C:\Windows\CCM\Logs\SensorManagedProvider.Log
      http://www.w3.org/2001/XMLSchema-instance
      http://www.w3.org/2001/XMLSchema

[+] Completed execution in 00:00:09.8748192

Use PowerShell to enumerate the Distribution Point value within the HKLM:\SOFTWARE\Microsoft\SMS\DP registry key:

PS C:\Tools> (Get-ItemProperty -Path HKLM:\SOFTWARE\Microsoft\SMS\DP -Name ManagementPoints).ManagementPoints

atlas.aperture.local

References