{'created': '2020-01-23T18:53:54.377Z',
 'created_by_ref': 'identity--c78cb6e5-0c4b-4611-8297-d1b8b55e40b5',
 'description': 'Adversaries may abuse Compiled HTML files (.chm) to conceal '
                'malicious code. CHM files are commonly distributed as part of '
                'the Microsoft HTML Help system. CHM files are compressed '
                'compilations of various content such as HTML documents, '
                'images, and scripting/web related programming languages such '
                'VBA, JScript, Java, and ActiveX. (Citation: Microsoft HTML '
                'Help May 2018) CHM content is displayed using underlying '
                'components of the Internet Explorer browser (Citation: '
                'Microsoft HTML Help ActiveX) loaded by the HTML Help '
                'executable program (hh.exe). (Citation: Microsoft HTML Help '
                'Executable Program)\n'
                '\n'
                'A custom CHM file containing embedded payloads could be '
                'delivered to a victim then triggered by [User '
                'Execution](https://attack.mitre.org/techniques/T1204). CHM '
                'execution may also bypass application application control on '
                'older and/or unpatched systems that do not account for '
                'execution of binaries through hh.exe. (Citation: MsitPros CHM '
                'Aug 2017) (Citation: Microsoft CVE-2017-8625 Aug 2017)',
 'external_references': [{'external_id': 'T1218.001',
                          'source_name': 'mitre-attack',
                          'url': 'https://attack.mitre.org/techniques/T1218/001'},
                         {'description': 'Microsoft. (2017, August 8). '
                                         'CVE-2017-8625 - Internet Explorer '
                                         'Security Feature Bypass '
                                         'Vulnerability. Retrieved October 3, '
                                         '2018.',
                          'source_name': 'Microsoft CVE-2017-8625 Aug 2017',
                          'url': 'https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-8625'},
                         {'description': 'Microsoft. (2018, May 30). Microsoft '
                                         'HTML Help 1.4. Retrieved October 3, '
                                         '2018.',
                          'source_name': 'Microsoft HTML Help May 2018',
                          'url': 'https://docs.microsoft.com/previous-versions/windows/desktop/htmlhelp/microsoft-html-help-1-4-sdk'},
                         {'description': 'Microsoft. (n.d.). About the HTML '
                                         'Help Executable Program. Retrieved '
                                         'October 3, 2018.',
                          'source_name': 'Microsoft HTML Help Executable '
                                         'Program',
                          'url': 'https://msdn.microsoft.com/windows/desktop/ms524405'},
                         {'description': 'Microsoft. (n.d.). HTML Help ActiveX '
                                         'Control Overview. Retrieved October '
                                         '3, 2018.',
                          'source_name': 'Microsoft HTML Help ActiveX',
                          'url': 'https://msdn.microsoft.com/windows/desktop/ms644670'},
                         {'description': 'Moe, O. (2017, August 13). Bypassing '
                                         'Device guard UMCI using CHM – '
                                         'CVE-2017-8625. Retrieved October 3, '
                                         '2018.',
                          'source_name': 'MsitPros CHM Aug 2017',
                          'url': 'https://oddvar.moe/2017/08/13/bypassing-device-guard-umci-using-chm-cve-2017-8625/'}],
 'id': 'attack-pattern--a6937325-9321-4e2e-bb2b-3ed2d40b2a9d',
 'kill_chain_phases': [{'kill_chain_name': 'mitre-attack',
                        'phase_name': 'defense-evasion'}],
 'modified': '2025-10-24T17:49:11.609Z',
 'name': 'Compiled HTML File',
 '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': ['Rahmat Nurfauzi, @infosecn1nja, PT Xynexis '
                          'International'],
 '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': '2.2'}

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