MITRE ATT&CK Technique
Collection T1056.003
Description

Adversaries may install code on externally facing portals, such as a VPN login page, to capture and transmit credentials of users who attempt to log into the service. For example, a compromised login page may log provided user credentials before logging the user in to the service. This variation on input capture may be conducted post-compromise using legitimate administrative access as a backup measure to maintain network access through [External Remote Services](https://attack.mitre.org/techniques/T1133) and [Valid Accounts](https://attack.mitre.org/techniques/T1078) or as part of the initial compromise by exploitation of the externally facing web service.(Citation: Volexity Virtual Private Keylogging)

Supported Platforms
Linux macOS Windows
Created

April 29, 2026

Last Updated

April 29, 2026

STIX Data
{'created': '2020-02-11T18:59:50.058Z',
 'created_by_ref': 'identity--c78cb6e5-0c4b-4611-8297-d1b8b55e40b5',
 'description': 'Adversaries may install code on externally facing portals, '
                'such as a VPN login page, to capture and transmit credentials '
                'of users who attempt to log into the service. For example, a '
                'compromised login page may log provided user credentials '
                'before logging the user in to the service.\n'
                '\n'
                'This variation on input capture may be conducted '
                'post-compromise using legitimate administrative access as a '
                'backup measure to maintain network access through [External '
                'Remote Services](https://attack.mitre.org/techniques/T1133) '
                'and [Valid '
                'Accounts](https://attack.mitre.org/techniques/T1078) or as '
                'part of the initial compromise by exploitation of the '
                'externally facing web service.(Citation: Volexity Virtual '
                'Private Keylogging)',
 'external_references': [{'external_id': 'T1056.003',
                          'source_name': 'mitre-attack',
                          'url': 'https://attack.mitre.org/techniques/T1056/003'},
                         {'description': 'Adair, S. (2015, October 7). Virtual '
                                         'Private Keylogging: Cisco Web VPNs '
                                         'Leveraged for Access and '
                                         'Persistence. Retrieved March 20, '
                                         '2017.',
                          'source_name': 'Volexity Virtual Private Keylogging',
                          'url': 'https://www.volexity.com/blog/2015/10/07/virtual-private-keylogging-cisco-web-vpns-leveraged-for-access-and-persistence/'}],
 'id': 'attack-pattern--69e5226d-05dc-4f15-95d7-44f5ed78d06e',
 'kill_chain_phases': [{'kill_chain_name': 'mitre-attack',
                        'phase_name': 'collection'},
                       {'kill_chain_name': 'mitre-attack',
                        'phase_name': 'credential-access'}],
 'modified': '2025-10-24T17:48:54.254Z',
 'name': 'Web Portal Capture',
 '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': ['Linux', 'macOS', 'Windows'],
 'x_mitre_version': '1.1'}
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Related Threat Actors (1)
Winter Vivern
High