MITRE ATT&CK Technique
Defense Evasion T1078.001
Description

Adversaries may obtain and abuse credentials of a default account as a means of gaining Initial Access, Persistence, Privilege Escalation, or Defense Evasion. Default accounts are those that are built-into an OS, such as the Guest or Administrator accounts on Windows systems. Default accounts also include default factory/provider set accounts on other types of systems, software, or devices, including the root user account in AWS, the root user account in ESXi, and the default service account in Kubernetes.(Citation: Microsoft Local Accounts Feb 2019)(Citation: AWS Root User)(Citation: Threat Matrix for Kubernetes) Default accounts are not limited to client machines; rather, they also include accounts that are preset for equipment such as network devices and computer applications, whether they are internal, open source, or commercial. Appliances that come preset with a username and password combination pose a serious threat to organizations that do not change it post installation, as they are easy targets for an adversary. Similarly, adversaries may also utilize publicly disclosed or stolen [Private Keys](https://attack.mitre.org/techniques/T1552/004) or credential materials to legitimately connect to remote environments via [Remote Services](https://attack.mitre.org/techniques/T1021).(Citation: Metasploit SSH Module) Default accounts may be created on a system after initial setup by connecting or integrating it with another application. For example, when an ESXi server is connected to a vCenter server, a default privileged account called `vpxuser` is created on the ESXi server. If a threat actor is able to compromise this account’s credentials (for example, via [Exploitation for Credential Access](https://attack.mitre.org/techniques/T1212) on the vCenter host), they will then have access to the ESXi server.(Citation: Google Cloud Threat Intelligence VMWare ESXi Zero-Day 2023)(Citation: Pentera vCenter Information Disclosure)

Supported Platforms
Windows SaaS IaaS Linux macOS Containers Network Devices Office Suite Identity Provider ESXi
Created

April 29, 2026

Last Updated

April 29, 2026

STIX Data
{'created': '2020-03-13T20:15:31.974Z',
 'created_by_ref': 'identity--c78cb6e5-0c4b-4611-8297-d1b8b55e40b5',
 'description': 'Adversaries may obtain and abuse credentials of a default '
                'account as a means of gaining Initial Access, Persistence, '
                'Privilege Escalation, or Defense Evasion. Default accounts '
                'are those that are built-into an OS, such as the Guest or '
                'Administrator accounts on Windows systems. Default accounts '
                'also include default factory/provider set accounts on other '
                'types of systems, software, or devices, including the root '
                'user account in AWS, the root user account in ESXi, and the '
                'default service account in Kubernetes.(Citation: Microsoft '
                'Local Accounts Feb 2019)(Citation: AWS Root User)(Citation: '
                'Threat Matrix for Kubernetes)\n'
                '\n'
                'Default accounts are not limited to client machines; rather, '
                'they also include accounts that are preset for equipment such '
                'as network devices and computer applications, whether they '
                'are internal, open source, or commercial. Appliances that '
                'come preset with a username and password combination pose a '
                'serious threat to organizations that do not change it post '
                'installation, as they are easy targets for an adversary. '
                'Similarly, adversaries may also utilize publicly disclosed or '
                'stolen [Private '
                'Keys](https://attack.mitre.org/techniques/T1552/004) or '
                'credential materials to legitimately connect to remote '
                'environments via [Remote '
                'Services](https://attack.mitre.org/techniques/T1021).(Citation: '
                'Metasploit SSH Module)\n'
                '\n'
                'Default accounts may be created on a system after initial '
                'setup by connecting or integrating it with another '
                'application. For example, when an ESXi server is connected to '
                'a vCenter server, a default privileged account called '
                '`vpxuser` is created on the ESXi server. If a threat actor is '
                'able to compromise this account’s credentials (for example, '
                'via [Exploitation for Credential '
                'Access](https://attack.mitre.org/techniques/T1212) on the '
                'vCenter host), they will then have access to the ESXi '
                'server.(Citation: Google Cloud Threat Intelligence VMWare '
                'ESXi Zero-Day 2023)(Citation: Pentera vCenter Information '
                'Disclosure)',
 'external_references': [{'external_id': 'T1078.001',
                          'source_name': 'mitre-attack',
                          'url': 'https://attack.mitre.org/techniques/T1078/001'},
                         {'description': 'Alexander Marvi, Brad Slaybaugh, Ron '
                                         'Craft, and Rufus Brown. (2023, June '
                                         '13). VMware ESXi Zero-Day Used by '
                                         'Chinese Espionage Actor to Perform '
                                         'Privileged Guest Operations on '
                                         'Compromised Hypervisors. Retrieved '
                                         'March 26, 2025.',
                          'source_name': 'Google Cloud Threat Intelligence '
                                         'VMWare ESXi Zero-Day 2023',
                          'url': 'https://cloud.google.com/blog/topics/threat-intelligence/vmware-esxi-zero-day-bypass/'},
                         {'description': 'Amazon. (n.d.). AWS Account Root '
                                         'User. Retrieved April 5, 2021.',
                          'source_name': 'AWS Root User',
                          'url': 'https://docs.aws.amazon.com/IAM/latest/UserGuide/id_root-user.html'},
                         {'description': 'Microsoft. (2018, December 9). Local '
                                         'Accounts. Retrieved February 11, '
                                         '2019.',
                          'source_name': 'Microsoft Local Accounts Feb 2019',
                          'url': 'https://docs.microsoft.com/en-us/windows/security/identity-protection/access-control/local-accounts'},
                         {'description': 'undefined. (n.d.). Retrieved April '
                                         '12, 2019.',
                          'source_name': 'Metasploit SSH Module',
                          'url': 'https://github.com/rapid7/metasploit-framework/tree/master/modules/exploits/linux/ssh'},
                         {'description': 'Weizman, Y. (2020, April 2). Threat '
                                         'Matrix for Kubernetes. Retrieved '
                                         'March 30, 2021.',
                          'source_name': 'Threat Matrix for Kubernetes',
                          'url': 'https://www.microsoft.com/security/blog/2020/04/02/attack-matrix-kubernetes/'},
                         {'description': 'Yuval Lazar. (2022, March 29). '
                                         'Mitigating VMware vCenter '
                                         'Information Disclosure. Retrieved '
                                         'March 26, 2025.',
                          'source_name': 'Pentera vCenter Information '
                                         'Disclosure',
                          'url': 'https://pentera.io/blog/information-disclosure-in-vmware-vcenter/'}],
 'id': 'attack-pattern--6151cbea-819b-455a-9fa6-99a1cc58797d',
 'kill_chain_phases': [{'kill_chain_name': 'mitre-attack',
                        'phase_name': 'defense-evasion'},
                       {'kill_chain_name': 'mitre-attack',
                        'phase_name': 'persistence'},
                       {'kill_chain_name': 'mitre-attack',
                        'phase_name': 'privilege-escalation'},
                       {'kill_chain_name': 'mitre-attack',
                        'phase_name': 'initial-access'}],
 'modified': '2025-10-24T17:48:51.181Z',
 'name': 'Default Accounts',
 '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_contributors': ['Janantha Marasinghe'],
 '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',
                       'SaaS',
                       'IaaS',
                       'Linux',
                       'macOS',
                       'Containers',
                       'Network Devices',
                       'Office Suite',
                       'Identity Provider',
                       'ESXi'],
 'x_mitre_version': '1.5'}
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