Supply voltage glitch attack is an easy and efficient method to induce faults in electronic devices. This attack represents a serious threat for hardware security. Considering analog circuits, due to the high simulation times and the complexity of the fault propagation, the analysis of glitch effects is still quite difficult. However, these faults can propagate to the digital part of an analog and mixed system involving serious security breaches. This work presents a behavioral modeling method applied to the analysis of the effects of glitch attacks on a clock generation system. This modeling method makes easier the fault propagation analysis and reduces the simulation time. This propagation analysis will allow developing efficient and optimal countermeasures against glitch attacks. This paper shows that, using behavioral models rather than transistor level simulation, the simulation time for fault propagation analysis can be reduced by a factor of 27 and so vulnerabilities can be identified in a shorter time.