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Process Created with a Duplicated Token

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Process Created with a Duplicated Token

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Identifies the creation of a process impersonating the token of another user logon session. Adversaries may create a new process with a different token to escalate privileges and bypass access controls.

Rule type: eql

Rule indices:

logs-endpoint.events.*

Severity: medium

Risk score: 47

Runs every: 5m

Searches indices from: now-9m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

https://docs.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-createprocesswithtokenw

Tags:

Domain: Endpoint
OS: Windows
Use Case: Threat Detection
Tactic: Privilege Escalation
Data Source: Elastic Defend

Version: 2

Rule authors:

Elastic

Rule license: Elastic License v2

Rule query

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/* This rule is only compatible with Elastic Endpoint 8.4+ */

process where host.os.type == "windows" and event.action == "start" and

 user.id : ("S-1-5-21-*", "S-1-12-1-*") and

 (process.Ext.effective_parent.executable regex~ """[C-Z]:\\Windows\\(System32|SysWOW64)\\[a-zA-Z0-9\-\_\.]+\.exe""" or
  process.Ext.effective_parent.executable : "?:\\Windows\\explorer.exe") and

 (
  process.name : ("powershell.exe", "cmd.exe", "rundll32.exe", "notepad.exe", "net.exe", "ntdsutil.exe",
                  "tasklist.exe", "reg.exe", "certutil.exe", "bitsadmin.exe", "msbuild.exe", "esentutl.exe") or

  ((process.Ext.relative_file_creation_time <= 900 or process.Ext.relative_file_name_modify_time <= 900) and
   not process.code_signature.status : ("trusted", "errorExpired", "errorCode_endpoint*") and
   not process.executable : ("?:\\Program Files\\*", "?:\\Program Files (x86)\\*"))
 ) and
 not (process.name : "rundll32.exe" and
      process.command_line : ("*davclnt.dll,DavSetCookie*", "*?:\\Program Files*",
                              "*\\Windows\\System32\\winethc.dll*", "*\\Windows\\SYSTEM32\\EDGEHTML.dll*",
                              "*shell32.dll,SHCreateLocalServerRunDll*")) and
 not startswith~(process.Ext.effective_parent.name, process.parent.name) and
 not (process.name : "powershell.exe" and process.parent.name : "wmiprvse.exe" and process.Ext.effective_parent.executable : "?:\\Windows\\System32\\wsmprovhost.exe") and
 not (process.Ext.effective_parent.executable : "?:\\Windows\\System32\\RuntimeBroker.exe" and process.parent.executable : "?:\\Windows\\System32\\sihost.exe") and
 not (process.Ext.effective_parent.executable : "?:\\Windows\\System32\\sethc.exe" and process.parent.executable : "?:\\Windows\\System32\\svchost.exe") and
 not (process.Ext.effective_parent.executable : "?:\\Windows\\explorer.exe" and
      process.parent.executable : ("?:\\Windows\\System32\\svchost.exe", "?:\\Windows\\System32\\msiexec.exe", "?:\\Windows\\twain_32\\*.exe"))

Framework: MITRE ATT&CK^TM

Tactic:
- Name: Privilege Escalation
- ID: TA0004
- Reference URL: https://attack.mitre.org/tactics/TA0004/
Technique:
- Name: Access Token Manipulation
- ID: T1134
- Reference URL: https://attack.mitre.org/techniques/T1134/
Sub-technique:
- Name: Token Impersonation/Theft
- ID: T1134.001
- Reference URL: https://attack.mitre.org/techniques/T1134/001/
Sub-technique:
- Name: Create Process with Token
- ID: T1134.002
- Reference URL: https://attack.mitre.org/techniques/T1134/002/

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