Anomalous User Agent connection attempt

Identifies connection attempts (success or fail) from clients with very short or very long User Agent strings and with less than 100 connection attempts.

Detection logic

Detection requirements

Platform: Containers ESXi IaaS Linux macOS Network Devices Windows
The rule states no platform. This is derived from the ATT&CK technique it maps to.
Log source product: azuremonitor_iis
Log source service: w3ciislog

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Detection rules

Anomalous User Agent connection attempt

Detection logic

Detection requirements

MITRE ATT&CK mappings

From the source

Licence

Authorship

Detection rules