Windows6.1-kb958-488-v6001-x64.msu | Download

Double-clicking the .msu file triggers the Windows Update Standalone Installer (wusa.exe). This method is suitable for single-user troubleshooting but lacks logging verbosity required for enterprise auditing.

After thorough analysis, Windows6.1-kb958-488-v6001-x64.msu is not a legitimate Microsoft update. It may be:

Recommendation: Delete any copy of this file you encounter. Do not run it, even in a sandbox, unless you are a professional malware analyst. For genuine Windows 6.1 (Windows 7) updates, use the Microsoft Update Catalog or the official Windows Update service (extended support may require ESU licenses). Download Windows6.1-kb958-488-v6001-x64.msu

If you already downloaded or ran this file, disconnect from the network immediately and run a full offline scan with Windows Defender Offline or a reputable third-party rescue disk.

For scripted deployments, the following command syntax is standard: Double-clicking the

wusa.exe Windows6.1-KB958488-v6001-x64.msu /quiet /norestart

Let’s decode the structure:

| Component | Meaning | Standard ? | |-----------|---------|-------------| | Windows6.1 | Targets Windows 7 / Server 2008 R2 (NT 6.1) | ✅ Standard | | kb958488 | Knowledge Base article number | ⚠️ Suspicious – real KB numbers have 6–7 digits | | v6001 | Version/build tag (6001 = Windows Vista SP2/Server 2008) | ❌ Mismatch – Windows 6.1 + Vista build number | | x64 | 64-bit architecture | ✅ Standard | | .msu | Microsoft Update standalone package | ✅ Standard | Recommendation: Delete any copy of this file you encounter

Key red flag: KB958488 does not exist in Microsoft’s official catalog. The closest real updates are:

The filename appears to be a hybrid or altered name, possibly from a custom build, a renamed file, or an unofficial source.

If you run it (not recommended), monitor registry changes, file creations, and network connections using Process Monitor or Sysmon.