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Potential Process Injection from Malicious Document

Identifies child processes of frequently targeted Microsoft Office applications (Word, PowerPoint, Excel) with unusual process arguments and path. This behavior is often observed during exploitation of Office applications or from documents with malicious macros.

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: ?
References:

Tags:

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

Version: ?
Rule authors:

  • Elastic

Rule license: Elastic License v2

process where host.os.type == "windows" and event.action == "start" and
  process.parent.name : ("excel.exe", "powerpnt.exe", "winword.exe") and
  process.args_count == 1 and
  process.executable : (
    "?:\\Windows\\SysWOW64\\*.exe", "?:\\Windows\\system32\\*.exe"
  ) and
  not (process.executable : "?:\\Windows\\System32\\spool\\drivers\\x64\\*" and
       process.code_signature.trusted == true and not process.code_signature.subject_name : "Microsoft *") and
  not process.executable : (
    "?:\\Windows\\Sys*\\Taskmgr.exe",
    "?:\\Windows\\Sys*\\ctfmon.exe",
    "?:\\Windows\\System32\\notepad.exe")

Framework: MITRE ATT&CK

Framework: MITRE ATT&CK

Framework: MITRE ATT&CK