{"description": "Enterprise techniques used by SYNful Knock, ATT&CK software S0519 (v1.1)", "name": "SYNful Knock (S0519)", "domain": "enterprise-attack", "versions": {"layer": "4.5", "attack": "19", "navigator": "5.3.2"}, "techniques": [{"techniqueID": "T1556", "showSubtechniques": true}, {"techniqueID": "T1556.004", "comment": "[SYNful Knock](https://attack.mitre.org/software/S0519) has the capability to add its own custom backdoor password when it modifies the operating system of the affected network device.(Citation: Mandiant - Synful Knock)", "score": 1, "color": "#66b1ff", "showSubtechniques": true}, {"techniqueID": "T1601", "showSubtechniques": true}, {"techniqueID": "T1601.001", "comment": "[SYNful Knock](https://attack.mitre.org/software/S0519) is malware that is inserted into a network device by patching the operating system image.(Citation: Mandiant - Synful Knock)(Citation: Cisco Synful Knock Evolution)", "score": 1, "color": "#66b1ff", "showSubtechniques": true}, {"techniqueID": "T1205", "comment": "[SYNful Knock](https://attack.mitre.org/software/S0519) can be sent instructions via special packets to change its functionality. Code for new functionality can be included in these messages.(Citation: Mandiant - Synful Knock)", "score": 1, "color": "#66b1ff", "showSubtechniques": false}], "gradient": {"colors": ["#ffffff", "#66b1ff"], "minValue": 0, "maxValue": 1}, "legendItems": [{"label": "used by SYNful Knock", "color": "#66b1ff"}]}