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MediumMicrosoft Sentinel analytics

Detect excessive NXDOMAIN DNS queries - Anomaly based (ASIM DNS Solution)

This rule makes use of the series decompose anomaly method to generate an alert when client requests excessive amount of DNS queries to non-existent domains. This helps in identifying possible C2 communications. It…

Description

This rule makes use of the series decompose anomaly method to generate an alert when client requests excessive amount of DNS queries to non-existent domains. This helps in identifying possible C2 communications. It utilizes [ASIM](https://aka.ms/AboutASIM) normalization and is applied to any source that supports the ASIM DNS schema. The rule also depends on the "**DNSEssentialsCustomParser**" Parser, so please make sure it is installed and configured before you use this Rule.

Detection logic

Detection requirements

Platform
ESXiLinuxmacOSWindows

The rule states no platform. This is derived from the 2 ATT&CK techniques it maps to.

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