Execution via Microsoft DotNet ClickOnce Host

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Identifies the execution of DotNet ClickOnce installer via Dfsvc.exe trampoline. Adversaries may take advantage of ClickOnce to proxy execution of malicious payloads via trusted Microsoft processes.

Rule type: eql

Rule indices:

  • logs-endpoint.events.*

Severity: low

Risk score: 21

Runs every: 60m

Searches indices from: now-119m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References: None

Tags:

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

Version: 1

Rule authors:

  • Elastic

Rule license: Elastic License v2

Rule query

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sequence by user.id with maxspan=5s
 [process where host.os.type == "windows" and event.action == "start" and
  process.name : "rundll32.exe" and process.command_line : ("*dfshim*ShOpenVerbApplication*", "*dfshim*#*")]
 [network where host.os.type == "windows" and process.name : "dfsvc.exe"]

Framework: MITRE ATT&CKTM