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Threat Discovery Appliance (TDA) queries the network DNS server over 1500 times in 5 seconds

    • Updated:
    • 5 Jun 2014
    • Product/Version:
    • Threat Discovery Appliance 2.0
    • Threat Discovery Appliance 2.5
    • Platform:
    • Not Applicable N/A
Summary
It has been observed that TDA is performing over 1500 queries within 5 seconds on a company's DNS server. The query is for this site: tda21.url.trendmicro.com
A packet capture shows the following information:
  • No. Time Source Destination Protocol Info
    1 0.000000 10.0.10.17 10.0.41.1 DNS Standard query AAAA tda21.url.trendmicro.com
    Frame 1 (84 bytes on wire, 84 bytes captured)
    Ethernet II, Src: Cisco_08:3c:c1 (00:26:98:08:3c:c1), Dst: Supermic_5a:c8:f3 (00:30:48:5a:c8:f3)
    Internet Protocol, Src: 10.0.10.17 (10.0.10.17), Dst: 10.0.41.10 (10.0.41.1)
    User Datagram Protocol, Src Port: 51464 (51464), Dst Port: domain (53)
    Domain Name System (query)
  • No. Time Source Destination Protocol Info
    2 0.000231 10.0.10.17 10.0.41.1 DNS Standard query response CNAME gslb.url.trendmicro.com.akadns.net CNAME trendmicro.com.edgesuite.net CNAME a151.d.akamai.net
    Frame 2 (257 bytes on wire, 257 bytes captured)
    Ethernet II, Src: Supermic_5a:c8:f3 (00:30:48:5a:c8:f3), Dst: Cisco_07:df:c1 (00:26:98:07:df:c1)
    Internet Protocol, Src: 10.0.10.17 (10.0.10.17), Dst: 10.0.41.10 (10.0.41.1)
    User Datagram Protocol, Src Port: domain (53), Dst Port: 51464 (51464)
    Domain Name System (response)
Details
Public
The queries occur because the TDA will query our rating server to validate if a site that a user might be visiting is malicious or not. This query is for every HTTP request from a user.
Premium
Internal
Rating:
Category:
Troubleshoot
Solution Id:
1057449
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