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CriticalSigmaHQMax Altgelt (Nextron Systems)

Certificate Request Export to Exchange Webserver

Detects a write of an Exchange CSR to an untypical directory or with aspx name suffix which can be used to place a webshell

Detection logic

Detection requirements

Platform
LinuxmacOSNetwork DevicesWindows

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

Log source product
windows
Log source service
msexchange_management

Known benign triggers

  • Unlikely

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