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File or Directory Deletion Command

This rule identifies the execution of commands that can be used to delete files and directories. Adversaries may delete files and directories on a host system, such as logs, browser history, or malware.

Rule type: eql
Rule indices:

  • logs-endpoint.events.process-*

Rule Severity: low
Risk Score: 21
Runs every: 60m
Searches indices from: now-119m
Maximum alerts per execution: 100
References:

Tags:

  • Domain: Endpoint
  • OS: Windows
  • Use Case: Threat Detection
  • Tactic: Defense Evasion
  • Rule Type: BBR
  • Data Source: Elastic Defend

Version: 6
Rule authors:

  • Elastic

Rule license: Elastic License v2

process where host.os.type == "windows" and event.type == "start" and
(
  ((process.name : "rundll32.exe" or ?process.pe.original_file_name : "RUNDLL32.EXE") and process.args : "*InetCpl.cpl,Clear*") or
  ((process.name : "reg.exe" or ?process.pe.original_file_name : "reg.exe") and process.args : "delete") or
  (
    (process.name : "cmd.exe" or ?process.pe.original_file_name : "Cmd.Exe") and
    process.args : ("*rmdir*", "*rm *", "rm", "*del *", "del", "*erase *", "erase") and
    not process.args : (
          "*\\AppData\\Local\\Microsoft\\OneDrive\\*",
          "*\\AppData\\Local\\Temp\\DockerDesktop\\*",
          "*\\AppData\\Local\\Temp\\Report.*",
          "*\\AppData\\Local\\Temp\\*.PackageExtraction"
    )
  ) or
  ((process.name : "powershell.exe" or ?process.pe.original_file_name : "PowerShell.EXE") and
    process.args : ("*rmdir", "rm", "rd", "*Remove-Item*", "del", "*]::Delete(*"))
) and not user.id : "S-1-5-18"

Framework: MITRE ATT&CK