摘要:
Malware detection systems are presented in which a list is constructed of enterprise hosts to or from which each given enterprise network host sends or receives packets within a current measurement period and statistics are accumulated based on two or more measurement period lists, with a count value being derived from the statistics to indicate the number of other hosts to or from which each monitored host sent or received packets, and one or more monitored hosts may be identified as suspected of being infected with slow and/or distributed scanning malware for which the count value exceeds a threshold value.
摘要:
A method of detecting malware may include: a) examining header data in each PDU transferred by a port of an access switch to identify PDUs transferred from a local network device, b) extracting a far-end device address for PDUs based at least in part on examination of an address portion of the corresponding header data, c) maintaining fan-out information indicative of a quantity of unique far-end device addresses extracted from the PDUs during consecutive time windows, d) determining a current trend based on the fan-out information for a current time window, e) comparing the current trend to an expected trend, and f) identifying a suspected malware infection in the local network device when the current trend exceeds the expected trend by a trend threshold. A network element that may implement the method may include a header data processing unit, data storage logic, data processing logic, and malware identification logic.
摘要:
Methods and systems are presented for detection of malware such as worms in which a network switch entices the malware into sending scan packets by allocating one or more ports as bait addresses, sending outgoing bait packets, and identifying compromised hosts that send unexpected incoming packets to a bait address.
摘要:
Packets of a certain type from a certain source are directed to a system that estimates the set of destinations and the number of new destinations for which that source has sent packets during a time window Ti. Instead of maintaining tables with the complete destination addresses for each source, the destination addresses are hashed and stored in a small bit array. The sets of destinations for a number of successive time windows are OR'ed for building cumulative tables Ci, where Ci includes all destinations that have been seen between T0 and Ti. The new destinations are determined by counting the destinations set in Ti but not in Ci-1. Any change from the typical patterns can be suspected as being a slow scan.
摘要:
Malware detection systems and methods are presented in which header data of protocol data units (PDUs) are examined at a wireless access switch shared by multiple clients, and the PDU type and client are used to establish counters, with the count values being analyzed to identify clients suspected of being infected with malware.
摘要:
A system and method of authenticating the identity of a remote fax machine during a faxing operation is provided. An X.509-type Certificate received from the remote fax machine is validated to affirm it can be properly associated with the remote machine. The Certificate's public key is used to verify the remote fax machine has the corresponding private key. A Certificate's Common Name then compared to an Expected Name to authenticate the identity of the remote fax machine prior to sending a fax to prevent an unwanted misdirection of faxed information and to screen incoming faxes for unwanted spam.
摘要:
Packets of a certain type from a certain source are directed to a system that estimates the set of destinations and the number of new destinations for which that source has sent packets during a time window Ti. Instead of maintaining tables with the complete destination addresses for each source, the destination addresses are hashed and stored in a small bit array. The sets of destinations for a number of successive time windows are OR'ed for building cumulative tables Ci, where Ci includes all destinations that have been seen between T0 and Ti. The new destinations are determined by counting the destinations set in Ti but not in Ci-1. Any change from the typical patterns can be suspected as being a slow scan.
摘要:
Methods and systems are presented for detection of malware such as worms in which a network switch entices the malware into sending scan packets by allocating one or more ports as bait addresses, sending outgoing bait packets, and identifying compromised hosts that send unexpected incoming packets to a bait address.
摘要:
Malware detection systems and methods are presented in which header data of protocol data units (PDUs) are examined at a wireless access switch shared by multiple clients, and the PDU type and client are used to establish counters, with the count values being analyzed to identify clients suspected of being infected with malware.
摘要:
A method for establishing a pseudo-wire connection between first and second switches in a packet switched network, the method comprising: sending a label mapping message to the second switch requesting that the pseudo-wire connection be established with the first switch; reserving resources for the pseudo-wire connection at the first switch; receiving a label withdraw message from the second switch if the second switch has insufficient resources for the pseudo-wire connection and, in response to the label withdraw message, releasing the resources for the pseudo-wire connection at the first switch; and, activating the pseudo-wire connection if the second switch has sufficient resources for the pseudo-wire connection, thereby optimizing resources for establishing pseudo -wire connections of each of the first and second switches.