26-08-2021 дата публикации
Номер: US20210266293A1
Принадлежит:
Detection of DNS tunneling traffic is disclosed. A DNS query comprising a subdomain portion and a root domain portion is received from a client device. A determination is made that the root domain portion received in the DNS query is associated with a malicious DNS tunneling root domain. A remedial action is taken in response to the determining. 1. A system , comprising: receive a DNS query comprising a subdomain portion and a root domain portion from a client device;', 'determine that the root domain portion received in the DNS query is associated with a malicious DNS tunneling root domain; and', 'take a remedial action in response to the determining; and, 'a processor configured toa memory coupled to the processor and configured to provide the processor with instructions.2. The system of wherein taking the remedial action includes preventing the client device from communicating with a malicious DNS server.3. The system of wherein claim 1 , in response to receiving the DNS query claim 1 , a feature vector associated with the root domain portion is updated.4. The system of wherein the feature vector maintains information for a sliding time window of DNS query information.5. The system of wherein a feature included in the feature vector represents a number of distinct fully qualified domain names associated with the root domain portion.6. The system of wherein a feature included in the feature vector represents an average DNS query count for each fully qualified domain name associated with the root domain portion.7. The system of wherein a feature included in the feature vector represents a Jeffrey distribution of DNS query counts for all fully qualified domain names associated with the root domain portion.8. The system of wherein a feature included in the feature vector represents an average length of fully qualified domain names associated with the root domain portion.9. The system of wherein a feature included in the feature vector represents a ratio of record ...
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