Abstract: Methods and systems for reducing the spread of malware in communication between an instant message (IM) client and an IM server are described. An IM filter module (IM FM) is configured to analyze messages exchanged between an IM server and an IM client. The IM FM also identifies one or more messages as possibly containing malware among the exchanged messages and assigns a confidence level to each identified message. A confidence level represents a probability of a message containing malware. A Bayesian filter is configured to train itself using the identified messages and the confidence levels and adjust the confidence levels. A feedback training mechanism for the Bayesian filter is also included. In particular, the IM FM examines additional messages exchanged between the IM server and IM client, identifies one or more messages as possibly containing malware among the additional messages using the adjusted confidence values. The IM FM also assigns a confidence level to each additionally identified message.

Abstract: Methods and systems for reducing the spread of malware in communication between an instant message (IM) client and an IM server are described. An IM filter module (IM FM) is configured to intercept a buddy list sent from an IM server to an IM client, add one or more fictitious buddies to the intercepted buddy list, and forward the buddy list with the one or more fictitious buddies to the IM client. The IM FM is further configured to identify a computer that hosts the IM client as a source of malware based on messages sent by the IM client to at least one of the fictitious buddies and to determine that the host computer of the IM client is a source of malware if a content of the messages sent to the at least one of the fictitious buddies contains malware.

Abstract: The present invention generally relates to systems and methods for utilizing a virtual automated agent, known as a bot, in an instant messaging network in a manner in which the bot can simulate its existence to one or more clients without having to exist on an instant messaging network. In one embodiment of the invention, a system can include a first proxy server having at least one registered automated agent, at least a first client communicating with the first proxy server, and a server maintaining presence data for the first client. The automated agent intercepts a contact list transmitted from the server to the first client, and the automated agent is added to the contact list, thereby enabling the automated agent to transmit a message to the client without transmitting the message through the server.

Abstract: The present invention relates generally to a system and method that provides add-on services and/or facilitates authentication, authorization and/or secure communications of a user using a dialog based interactive protocol and accessing a first computer system, separately from the authentication and security mechanism(s) provided by a second computer system using a dialog based interactive protocol system.