StandaloneUpdaterDaemon is a background process (daemon) found on Apple macOS systems. It is a component of Microsoft AutoUpdate (MAU), the utility responsible for keeping Microsoft applications like Word, Excel, PowerPoint, Outlook, and Teams up to date.
The "Standalone" in the name refers to Microsoft applications that are installed individually (perhaps from the Mac App Store or a direct download) rather than as part of a bundled Office suite installer. The "Daemon" indicates that it runs in the background without needing a user to be logged in or an application window to be open.
The Standalone Updater Daemon is a background service designed to manage software updates for a system or application suite without relying on existing package managers (e.g., apt, yum, winget) or manual intervention. It operates as an autonomous, always-running process that checks, downloads, verifies, and applies updates—even across system reboots. This write-up covers its design rationale, core components, lifecycle, security considerations, and failure recovery mechanisms.
All platforms share a common Go/Rust core; OS-specific adapters handle service registration and file locking.
| Threat | Mitigation |
|--------|-------------|
| Man-in-the-middle (manifest tampering) | TLS 1.3 + pinned certificates or public key pinning. |
| Compromised update server | Offline signing of manifests; daemon verifies signature using embedded public key. |
| Race condition during update | Filesystem locks (flock) and atomic renames; no window of partial read. |
| Privilege escalation | Daemon runs as least-privilege user (e.g., updater); uses sudo/polkit only for system-wide writes. |
| Denial of service via frequent updates | Minimum interval enforcement (e.g., 1 hour between attempts) and jitter. |
StandaloneUpdaterDaemon (often seen as StandaloneUpdaterDaemon.xpc
) is a background process on macOS primarily associated with Microsoft OneDrive Microsoft Office (via Microsoft AutoUpdate). Microsoft Learn Core Functionality
As a "daemon," this process runs in the background to handle specific system tasks without user interaction: AppleInsider Background Updates standaloneupdaterdaemon
: It checks for and installs updates for Microsoft applications independently of the Mac App Store. Privileged Execution
: It often operates with elevated permissions to allow the software to update itself even if the current user is not an administrator. Apple Support Community Common User Concerns Unidentified Developer Warnings : You may see this process listed in System Settings > General > Login Items
under "Allow in the Background". Because Microsoft sometimes does not sign these specific helper binaries with their primary developer certificate, macOS may flag it as being from an "Unidentified Developer". Performance Issues
: If the process becomes "Not Responding" or consumes high CPU, it can cause system slowdowns or crashes. Security Vulnerabilities
: Security researchers have previously identified "Local Privilege Escalation" vulnerabilities in this daemon, where its insecure verification methods could allow a low-privilege user to gain root access. Apple Support Community Troubleshooting and Fixes
If you are experiencing issues like the OneDrive app not opening or Microsoft AutoUpdate (MAU) failing, you can manage the daemon using these steps: Force Quit via Activity Monitor Activity Monitor from your Applications/Utilities folder. Search for "StandaloneUpdaterDaemon." Select the process and click the
button to terminate it. This often unfreezes a stuck update process. Manual Removal (For OneDrive Issues) Artifact
If OneDrive fails to start, some users resolve it by right-clicking the OneDrive icon in Applications and selecting Show Package Contents Navigate to the internal folders (e.g., Contents/MacOS Contents/Helpers ) and delete StandaloneUpdaterDaemon.xpc
This should only be done if the app is consistently failing, as it may break automatic updates. Disable in Login Items System Settings > General > Login Items
Toggle off the entry for "StandaloneUpdaterDaemon" to prevent it from starting automatically when you log in. Apple Support Community securely reinstall Microsoft AutoUpdate to resolve these daemon errors? MAU still didn't work - Microsoft Q&A
It is a background agent (daemon) designed to check for, download, and install updates for specific applications without requiring the main application to be open. On macOS, users often encounter it in Activity Monitor or Apple Support Community threads when troubleshooting system performance. Common Issues & Solutions
High CPU/Memory Usage: Daemons like this can occasionally consume excessive resources while indexing or verifying files. If your Mac is sluggish, experts often recommend checking for "Google cruft" and using tools to completely remove residual update files if the behavior persists.
Battery Drain: Background update processes are known to prevent computers from entering a deep sleep state, leading to unexpected battery drain overnight.
Connectivity Conflicts: In some cases, third-party update daemons can conflict with macOS system updates (like Sonoma or Ventura) or external hardware drivers. How to Manage It Policy
Monitor Activity: Open Activity Monitor (Cmd + Space, type "Activity Monitor") to see if the process is currently "not responding" or using high CPU.
Toggle Auto-Updates: Within the settings of the parent app (e.g., Chrome or Microsoft Office), you can often switch from "Automatic" to "Manual" updates to prevent the daemon from running constantly.
Check LaunchAgents: More advanced users can find the configuration files for these daemons in /Library/LaunchAgents or ~/Library/LaunchAgents to disable them manually.
Are you seeing this process causing performance lag, or are you trying to manually disable a specific update service?
Outlook for Mac running very slowly after… - Apple Communities
A legitimate standaloneupdaterdaemon should consume negligible resources (typically < 50 MB RAM and 0-2% CPU). However, if you notice excessive resource usage, possible causes include:
False. Microsoft does not use a daemon by that name. Windows uses TrustedInstaller.exe, wuauclt.exe, or USOClient.exe for updates.