Execution via Microsoft DotNet ClickOnce Host

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.*

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

Tags:

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

Version: ?
Rule authors:

• Elastic

Rule license: Elastic License v2

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&CK

• Tactic:

  • Name: Defense Evasion
  • Id: TA0005
  • Reference URL: https://attack.mitre.org/tactics/TA0005/

• Technique:

  • Name: Trusted Developer Utilities Proxy Execution
  • Id: T1127
  • Reference URL: https://attack.mitre.org/techniques/T1127/

• Technique:

  • Name: System Binary Proxy Execution
  • Id: T1218
  • Reference URL: https://attack.mitre.org/techniques/T1218/

• Sub Technique:

  • Name: Rundll32
  • Id: T1218.011
  • Reference URL: https://attack.mitre.org/techniques/T1218/011/