{'created': '2022-03-28T15:34:44.590Z',
 'created_by_ref': 'identity--c78cb6e5-0c4b-4611-8297-d1b8b55e40b5',
 'description': 'Adversaries may abuse components of Terminal Services to '
                'enable persistent access to systems. Microsoft Terminal '
                'Services, renamed to Remote Desktop Services in some Windows '
                'Server OSs as of 2022, enable remote terminal connections to '
                'hosts. Terminal Services allows servers to transmit a full, '
                'interactive, graphical user interface to clients via '
                'RDP.(Citation: Microsoft Remote Desktop Services)\n'
                '\n'
                '[Windows '
                'Service](https://attack.mitre.org/techniques/T1543/003)s that '
                'are run as a "generic" process (ex: <code>svchost.exe</code>) '
                "load the service's DLL file, the location of which is stored "
                'in a Registry entry named <code>ServiceDll</code>.(Citation: '
                'Microsoft System Services Fundamentals) The '
                '<code>termsrv.dll</code> file, typically stored in '
                '`%SystemRoot%\\System32\\`, is the default '
                '<code>ServiceDll</code> value for Terminal Services in '
                '`HKLM\\System\\CurrentControlSet\\services\\TermService\\Parameters\\`.\n'
                '\n'
                'Adversaries may modify and/or replace the Terminal Services '
                'DLL to enable persistent access to victimized '
                'hosts.(Citation: James TermServ DLL) Modifications to this '
                'DLL could be done to execute arbitrary payloads (while also '
                'potentially preserving normal <code>termsrv.dll</code> '
                'functionality) as well as to simply enable abusable features '
                'of Terminal Services. For example, an adversary may enable '
                'features such as concurrent [Remote Desktop '
                'Protocol](https://attack.mitre.org/techniques/T1021/001) '
                'sessions by either patching the <code>termsrv.dll</code> file '
                'or modifying the <code>ServiceDll</code> value to point to a '
                'DLL that provides increased RDP functionality.(Citation: '
                'Windows OS Hub RDP)(Citation: RDPWrap Github) On a non-server '
                'Windows OS this increased functionality may also enable an '
                'adversary to avoid Terminal Services prompts that warn/log '
                'out users of a system when a new RDP session is created.',
 'external_references': [{'external_id': 'T1505.005',
                          'source_name': 'mitre-attack',
                          'url': 'https://attack.mitre.org/techniques/T1505/005'},
                         {'description': 'James. (2019, July 14). '
                                         '@James_inthe_box. Retrieved '
                                         'September 12, 2024.',
                          'source_name': 'James TermServ DLL',
                          'url': 'https://x.com/james_inthe_box/status/1150495335812177920'},
                         {'description': 'Microsoft. (2018, February 17). '
                                         'Windows System Services '
                                         'Fundamentals. Retrieved March 28, '
                                         '2022.',
                          'source_name': 'Microsoft System Services '
                                         'Fundamentals',
                          'url': 'https://social.technet.microsoft.com/wiki/contents/articles/12229.windows-system-services-fundamentals.aspx'},
                         {'description': 'Microsoft. (2019, August 23). About '
                                         'Remote Desktop Services. Retrieved '
                                         'March 28, 2022.',
                          'source_name': 'Microsoft Remote Desktop Services',
                          'url': 'https://docs.microsoft.com/windows/win32/termserv/about-terminal-services'},
                         {'description': "Stas'M Corp. (2014, October 22). RDP "
                                         "Wrapper Library by Stas'M. Retrieved "
                                         'March 28, 2022.',
                          'source_name': 'RDPWrap Github',
                          'url': 'https://github.com/stascorp/rdpwrap'},
                         {'description': 'Windows OS Hub. (2021, November 10). '
                                         'How to Allow Multiple RDP Sessions '
                                         'in Windows 10 and 11?. Retrieved '
                                         'March 28, 2022.',
                          'source_name': 'Windows OS Hub RDP',
                          'url': 'http://woshub.com/how-to-allow-multiple-rdp-sessions-in-windows-10/'}],
 'id': 'attack-pattern--379809f6-2fac-42c1-bd2e-e9dee70b27f8',
 'kill_chain_phases': [{'kill_chain_name': 'mitre-attack',
                        'phase_name': 'persistence'}],
 'modified': '2025-10-24T17:48:39.258Z',
 'name': 'Terminal Services DLL',
 'object_marking_refs': ['marking-definition--fa42a846-8d90-4e51-bc29-71d5b4802168'],
 'revoked': False,
 'spec_version': '2.1',
 'type': 'attack-pattern',
 'x_mitre_attack_spec_version': '3.2.0',
 'x_mitre_deprecated': False,
 'x_mitre_detection': '',
 'x_mitre_domains': ['enterprise-attack'],
 'x_mitre_is_subtechnique': True,
 'x_mitre_modified_by_ref': 'identity--c78cb6e5-0c4b-4611-8297-d1b8b55e40b5',
 'x_mitre_platforms': ['Windows'],
 'x_mitre_version': '1.0'}