Uncommon Registry Persistence Change

Detects changes to registry persistence keys that are not commonly used or modified by legitimate programs. This could be an indication of an adversary’s attempt to persist in a stealthy manner.

Rule type: eql

Rule indices:

logs-endpoint.events.registry-*
logs-windows.sysmon_operational-*
winlogbeat-*

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://www.microsoftpressstore.com/articles/article.aspx?p=2762082&seqNum=2

Tags:

Domain: Endpoint
OS: Windows
Use Case: Threat Detection
Tactic: Persistence
Data Source: Elastic Defend
Data Source: Sysmon

Version: 110

Rule authors:

Elastic

Rule license: Elastic License v2

Rule query

edit

registry where host.os.type == "windows" and event.type == "change" and
 length(registry.data.strings) > 0 and
 registry.path : (
      "HKLM\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Terminal Server\\Install\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Run\\*",
      "HKLM\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Terminal Server\\Install\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Runonce\\*",
      "HKEY_USERS\\*\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Windows\\Load",
      "HKEY_USERS\\*\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Windows\\Run",
      "HKLM\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Windows\\IconServiceLib",
      "HKLM\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Winlogon\\Shell",
      "HKEY_USERS\\*\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Winlogon\\Shell",
      "HKLM\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Winlogon\\AppSetup",
      "HKLM\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Winlogon\\Taskman",
      "HKLM\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Winlogon\\Userinit",
      "HKLM\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Winlogon\\VmApplet",
      "HKLM\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Policies\\Explorer\\Run\\*",
      "HKLM\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Policies\\System\\Shell",
      "HKLM\\SOFTWARE\\Policies\\Microsoft\\Windows\\System\\Scripts\\Logoff\\Script",
      "HKLM\\SOFTWARE\\Policies\\Microsoft\\Windows\\System\\Scripts\\Logon\\Script",
      "HKLM\\SOFTWARE\\Policies\\Microsoft\\Windows\\System\\Scripts\\Shutdown\\Script",
      "HKLM\\SOFTWARE\\Policies\\Microsoft\\Windows\\System\\Scripts\\Startup\\Script",
      "HKEY_USERS\\*\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Policies\\Explorer\\Run\\*",
      "HKEY_USERS\\*\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Policies\\System\\Shell",
      "HKEY_USERS\\*\\SOFTWARE\\Policies\\Microsoft\\Windows\\System\\Scripts\\Logoff\\Script",
      "HKEY_USERS\\*\\SOFTWARE\\Policies\\Microsoft\\Windows\\System\\Scripts\\Logon\\Script",
      "HKEY_USERS\\*\\SOFTWARE\\Policies\\Microsoft\\Windows\\System\\Scripts\\Shutdown\\Script",
      "HKEY_USERS\\*\\SOFTWARE\\Policies\\Microsoft\\Windows\\System\\Scripts\\Startup\\Script",
      "HKLM\\SOFTWARE\\Microsoft\\Active Setup\\Installed Components\\*\\ShellComponent",
      "HKLM\\SOFTWARE\\Microsoft\\Windows CE Services\\AutoStartOnConnect\\MicrosoftActiveSync",
      "HKLM\\SOFTWARE\\Microsoft\\Windows CE Services\\AutoStartOnDisconnect\\MicrosoftActiveSync",
      "HKLM\\SOFTWARE\\Microsoft\\Ctf\\LangBarAddin\\*\\FilePath",
      "HKLM\\SOFTWARE\\Microsoft\\Internet Explorer\\Extensions\\*\\Exec",
      "HKLM\\SOFTWARE\\Microsoft\\Internet Explorer\\Extensions\\*\\Script",
      "HKLM\\SOFTWARE\\Microsoft\\Command Processor\\Autorun",
      "HKEY_USERS\\*\\SOFTWARE\\Microsoft\\Ctf\\LangBarAddin\\*\\FilePath",
      "HKEY_USERS\\*\\SOFTWARE\\Microsoft\\Internet Explorer\\Extensions\\*\\Exec",
      "HKEY_USERS\\*\\SOFTWARE\\Microsoft\\Internet Explorer\\Extensions\\*\\Script",
      "HKEY_USERS\\*\\SOFTWARE\\Microsoft\\Command Processor\\Autorun",
      "HKEY_USERS\\*\\Control Panel\\Desktop\\scrnsave.exe",
      "HKLM\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Image File Execution Options\\*\\VerifierDlls",
      "HKLM\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Winlogon\\GpExtensions\\*\\DllName",
      "HKLM\\SYSTEM\\ControlSet*\\Control\\SafeBoot\\AlternateShell",
      "HKLM\\SYSTEM\\ControlSet*\\Control\\Terminal Server\\Wds\\rdpwd\\StartupPrograms",
      "HKLM\\SYSTEM\\ControlSet*\\Control\\Terminal Server\\WinStations\\RDP-Tcp\\InitialProgram",
      "HKLM\\SYSTEM\\ControlSet*\\Control\\Session Manager\\BootExecute",
      "HKLM\\SYSTEM\\ControlSet*\\Control\\Session Manager\\SetupExecute",
      "HKLM\\SYSTEM\\ControlSet*\\Control\\Session Manager\\Execute",
      "HKLM\\SYSTEM\\ControlSet*\\Control\\Session Manager\\S0InitialCommand",
      "HKLM\\SYSTEM\\ControlSet*\\Control\\ServiceControlManagerExtension",
      "HKLM\\SYSTEM\\ControlSet*\\Control\\BootVerificationProgram\\ImagePath",
      "HKLM\\SYSTEM\\Setup\\CmdLine",
      "HKEY_USERS\\*\\Environment\\UserInitMprLogonScript") and

 not registry.data.strings : ("C:\\Windows\\system32\\userinit.exe", "cmd.exe", "C:\\Program Files (x86)\\*.exe",
                              "C:\\Program Files\\*.exe") and
 not (process.name : "rundll32.exe" and registry.path : "*\\Software\\Microsoft\\Internet Explorer\\Extensions\\*\\Script") and
 not process.executable : ("C:\\Windows\\System32\\msiexec.exe",
                           "C:\\Windows\\SysWOW64\\msiexec.exe",
                           "C:\\ProgramData\\Microsoft\\Windows Defender\\Platform\\*\\MsMpEng.exe",
                           "C:\\Program Files\\*.exe",
                           "C:\\Program Files (x86)\\*.exe") and
 not (process.name : ("TiWorker.exe", "poqexec.exe") and registry.value : "SetupExecute" and
      registry.data.strings : (
        "C:\\windows\\System32\\poqexec.exe /display_progress \\SystemRoot\\WinSxS\\pending.xml",
        "C:\\Windows\\System32\\poqexec.exe /skip_critical_poq /display_progress \\SystemRoot\\WinSxS\\pending.xml"
      )
     ) and
 not (process.name : "svchost.exe" and registry.value : "SCRNSAVE.EXE" and
      registry.data.strings : (
        "%windir%\\system32\\rundll32.exe user32.dll,LockWorkStation",
        "scrnsave.scr",
        "%windir%\\system32\\Ribbons.scr"
      )
     )

Framework: MITRE ATT&CK^TM

Tactic:
- Name: Persistence
- ID: TA0003
- Reference URL: https://attack.mitre.org/tactics/TA0003/
Technique:
- Name: Event Triggered Execution
- ID: T1546
- Reference URL: https://attack.mitre.org/techniques/T1546/
Sub-technique:
- Name: Screensaver
- ID: T1546.002
- Reference URL: https://attack.mitre.org/techniques/T1546/002/
Technique:
- Name: Boot or Logon Autostart Execution
- ID: T1547
- Reference URL: https://attack.mitre.org/techniques/T1547/
Sub-technique:
- Name: Registry Run Keys / Startup Folder
- ID: T1547.001
- Reference URL: https://attack.mitre.org/techniques/T1547/001/
Tactic:
- Name: Defense Evasion
- ID: TA0005
- Reference URL: https://attack.mitre.org/tactics/TA0005/
Technique:
- Name: Modify Registry
- ID: T1112
- Reference URL: https://attack.mitre.org/techniques/T1112/

« New ActiveSyncAllowedDeviceID Added via PowerShell Account Password Reset Remotely »