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MediumSigmaHQSwachchhanda Shrawan Poudel (Nextron Systems)

IIS WebServer Log Deletion via CommandLine Utilities

Detects attempts to delete Internet Information Services (IIS) log files via command line utilities, which is a common defense evasion technique used by attackers to cover their tracks. Threat actors often abuse…

Description

Detects attempts to delete Internet Information Services (IIS) log files via command line utilities, which is a common defense evasion technique used by attackers to cover their tracks. Threat actors often abuse vulnerabilities in web applications hosted on IIS servers to gain initial access and later delete IIS logs to evade detection.

Detection logic

Detection requirements

Platform
ContainersESXiLinuxmacOSNetwork DevicesOffice SuiteWindows

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

Log source product
windows
Log source category
process_creation

Known benign triggers

  • Deletion of IIS logs that are older than a certain retention period as part of regular maintenance activities.
  • Legitimate schedule tasks or scripts that clean up log files regularly.

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