11. A system for detecting network anomalies, the system comprising: a memory; and a hardware processor that, when executing computer-executable instructions stored in the memory, is configured to: receive a communication protocol message having an argument string that is transmitted from a first processor to a second processor across a computer network; apply a probabilistic model to the received communication protocol message to determine whether the communication protocol message is anomalous based on determining that at least one n-gram in the communication protocol message is anomalous, wherein the probabilistic model uses at least one Markov chain specified by one or more parameters to determine a probability that the argument string is anomalous based on n-grams in the argument string; and perform a predetermined action in response to determining that the communication protocol message is anomalous.
11. A system for detecting network anomalies, the system comprising: a memory; and a hardware processor that, when executing computer-executable instructions stored in the memory, is configured to: receive a communication protocol message having an argument string that is transmitted from a first processor to a second processor across a computer network; apply a probabilistic model to the received communication protocol message to determine whether the communication protocol message is anomalous based on determining that at least one n-gram in the communication protocol message is anomalous, wherein the probabilistic model uses at least one Markov chain specified by one or more parameters to determine a probability that the argument string is anomalous based on n-grams in the argument string; and perform a predetermined action in response to determining that the communication protocol message is anomalous. 13. The system of claim 11 , wherein the one or more parameters includes mixture size that specifies a number of Markov chains to use in the probabilistic model and wherein the at least one Markov chain is a mixture of Markov chains specified by the mixture size.