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Cyber Intrusion alerts are commonly collected by corporations to analyze network traffic and glean information about attacks perpetrated against the network. However, datasets of true malignant alerts are rare and generally only show one potential attack scenario out of many possible ones. Furthermore, it is difficult to expand the analysis of these alerts through artificial means due to the complexity of feature dependencies within an alert and lack of rare yet critical samples. This work proposes the use of a Mutual Information constrained Generative Adversarial Network as a means to synthesize new alerts from historical data. Histogram Intersection and Conditional Entropy are used to show the performance of this model as well as its ability to learn intricate feature dependencies. The proposed models are able to capture a much wider domain of alert feature values than standard Generative Adversarial Networks. Finally, we show that when looking at alerts from the perspective of attack stages, the proposed models are able to capture critical attacker behavior providing direct semantic meaning to generated samples.