The DNS vs Privacy Conundrum: Where are we headed?

Wireshark capture of DNS over TLS hand shake
  • Review hosts with a high volume of uncommon record types (TXT, NULL, CNAME, etc.).
  • Explore uncommon TLDs (.xyz, .me, .biz) and TLDs for geographical regions in which your organization does not regularly operate.
  • Look for large volume of NXDOMAIN (domain does not exist) response codes to detect possible DNS C2 through Domain Generation Algorithm (DGA).
  • Look for hosts with high DNS request volume for multiple sub domains of a single parent domain.
  • Identify suspicious requests by reviewing queries of domains that have a high level of entropy. Be careful though, many legitimate cloud URLs also match this pattern.
  • Many more….




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Sanjeev Singh

Sanjeev Singh

An avid learner and passionate cyber defender

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