{"description": "Enterprise techniques used by SYNful Knock, ATT&CK software S0519 v1.0", "name": "SYNful Knock (S0519)", "domain": "enterprise-attack", "versions": {"layer": "4.3", "attack": "10", "navigator": "4.5"}, "techniques": [{"techniqueID": "T1556", "showSubtechniques": true}, {"score": 1, "techniqueID": "T1556.004", "showSubtechniques": true, "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: FireEye - Synful Knock)"}, {"techniqueID": "T1601", "showSubtechniques": true}, {"score": 1, "techniqueID": "T1601.001", "showSubtechniques": true, "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: FireEye - Synful Knock)(Citation: Cisco Synful Knock Evolution)"}, {"score": 1, "techniqueID": "T1205", "showSubtechniques": false, "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: FireEye - Synful Knock)"}], "gradient": {"colors": ["#ffffff", "#66b1ff"], "minValue": 0, "maxValue": 1}, "legendItems": [{"label": "used by SYNful Knock", "color": "#66b1ff"}]}