Macro/VBA Detector
Upload any Office document (DOCX, XLSX, PPTX) to scan for embedded VBA macros. Our Macro/VBA Detector parses the ZIP-based file structure to find VBA project binaries, extracts macro names and module information, and identifies auto-execute macros that run automatically on document events. All processing is local in your browser for complete privacy - no signup required.
Upload any Office document (DOCX, XLSX, PPTX) to scan for embedded VBA macros. Detects macro names, identifies auto-execute macros, and highlights security risks. All processing is local - no data is uploaded to any server.
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Supports DOCX, XLSX, and PPTX files
Upload any Office Open XML document (DOCX, XLSX, PPTX) to scan for embedded VBA macros. The detector parses the ZIP-based file structure to find vbaProject.bin entries, extracts macro names from the binary VBA project data, and identifies auto-execute macros that run automatically on document events (Open, Close, Activate, etc.). All processing is done entirely in your browser - no data is uploaded to any server.
Why Use Our Macro/VBA Detector?
Instant Macro Detection
Upload any Office document and instantly scan for embedded VBA macros. Our Macro/VBA Detector parses the ZIP-based OOXML structure to find vbaProject.bin files, extracts macro names from the binary VBA project data, and identifies auto-execute macros - all in seconds with no server uploads.
Auto-Execute Macro Detection
The detector automatically identifies dangerous auto-execute macros that run when a document is opened, closed, or activated. Macros like Auto_Open, Workbook_Open, Document_Open, and Auto_Exec are flagged with clear warnings so you can assess the risk before enabling content.
Deep Binary VBA Analysis
Unlike simple string scanners, our detector parses the actual VBA project binary data to find module names, Sub/Function declarations, and auto-execute triggers. It searches across all common VBA project locations in the document structure for comprehensive coverage.
100% Private Browser Processing
Your documents never leave your device. All ZIP parsing, VBA binary analysis, and macro detection happens locally in your browser. No data is uploaded to any server - complete privacy guaranteed for sensitive document analysis.
Common Use Cases for Macro/VBA Detector
Security Incident Investigation
Security analysts investigating phishing or malware incidents can quickly scan suspicious Office documents for malicious VBA macros. Detect auto-execute macros, identify suspicious macro names, and assess the risk level of enabling content before opening potentially dangerous attachments.
Email Attachment Screening
IT administrators and security teams can screen email attachments for embedded macros as part of their security workflow. Identify documents with auto-execute macros that could be used to deliver ransomware, spyware, or other malware through phishing campaigns.
VBA Development & Debugging
VBA developers can verify that their macros are properly embedded in Office documents before distribution. Check that all expected module names appear, validate auto-execute triggers, and ensure the VBA project structure is intact and correctly configured.
Enterprise Document Security Policy
Organizations enforcing security policies around macro-enabled documents can use the detector to verify compliance. Check that documents do not contain unauthorized macros or auto-execute triggers before allowing them through security gateways.
Cybersecurity Education & Training
Instructors teaching cybersecurity awareness can use the detector to demonstrate how macros work in Office documents, how auto-execute macros pose security risks, and how to identify potentially malicious documents before opening them.
Forensic Document Analysis
Digital forensic examiners analyzing evidence files can determine if Office documents contain macros that may have executed automatically. Documenting macro presence, names, and auto-execute triggers is critical for building a complete forensic timeline.
Understanding VBA Macro Detection in Office Documents
What are VBA Macros in Office Documents?
VBA (Visual Basic for Applications) macros are small programs embedded within Microsoft Office documents that automate repetitive tasks, extend functionality, or create custom workflows. Macros are written in the VBA programming language and stored in a binary format (vbaProject.bin) inside Office Open XML (OOXML) files - DOCX, XLSX, and PPTX - which are essentially ZIP archives containing structured XML and binary data. While macros are legitimate productivity tools, they are also commonly exploited by attackers to deliver malware through phishing emails, making macro detection an essential part of document security analysis.
How Our Macro/VBA Detector Works
- Parse Document Structure: You upload an Office document (DOCX, XLSX, or PPTX) and the detector reads the ZIP archive structure to find all internal files. It specifically looks for
vbaProject.binentries, which contain the compiled VBA project with all macros. - Extract & Analyze VBA Data: The detector decompresses the VBA project binary and scans for macro identifiers - Sub and Function declarations, module names, and procedure references. It searches both the decoded text and the raw binary data to find all macro names using pattern matching.
- Identify Auto-Execute Triggers: Each detected macro is checked against a comprehensive list of auto-execute patterns - Auto_Open, Workbook_Open, Document_Open, Sheet_Activate, and 20+ more. Macros with auto-execute triggers are flagged with clear warnings to highlight potential security risks.
Why Auto-Execute Macros Are Dangerous
- Auto_Open / Auto_Exec: These legacy macros run automatically when a document is opened in older versions of Office. They can execute arbitrary VBA code without user interaction, making them a common vector for malware delivery.
- Workbook_Open / Document_Open: These event handlers in modern Office applications trigger when a workbook or document is opened. Attackers use these to execute payloads immediately upon document opening, often with social engineering prompts to trick users into enabling content.
- Workbook_BeforeClose / Document_Close: These triggers execute when a document is closed, potentially enabling persistence mechanisms or data exfiltration after the user has finished working with the file.
- Sheet_Activate / Sheet_Change: These event handlers run when the user interacts with spreadsheet cells or switches sheets, allowing macros to execute based on user activity rather than just document lifecycle events.
Privacy, Security & Availability
The Macro/VBA Detector processes all documents entirely within your browser using client-side JavaScript. No document data is ever uploaded to any server - every byte stays on your device. All ZIP parsing, VBA binary analysis, and macro detection happens locally. There are no file size limits, no signup requirements, and no usage caps. The tool is 100% free to use with no hidden premium features. Whether you are screening a suspicious email attachment or auditing your own macro-enabled documents, your privacy and security are guaranteed.
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Frequently Asked Questions About Macro/VBA Detector
VBA (Visual Basic for Applications) macros are programs embedded within Office documents that automate tasks. They are stored as binary data (vbaProject.bin) inside DOCX, XLSX, and PPTX files - which are technically ZIP archives. Macros can be legitimate productivity tools or malicious code used in phishing attacks.
The Macro/VBA Detector supports Office Open XML (OOXML) formats: DOCX (Word), XLSX (Excel), and PPTX (PowerPoint). Legacy binary formats like DOC, XLS, and PPT are not supported. All processing is local in your browser.
Auto-execute macros are VBA procedures that run automatically when a document event occurs - opening, closing, or activating the document. Examples include Auto_Open, Workbook_Open, and Document_Open. They are dangerous because they can execute code without user interaction if macros are enabled, making them a common malware delivery vector.
The detector extracts macro names, module names, and identifies auto-execute triggers. It does not decompile or display the actual VBA source code. For detailed code review, you would need to open the document in an Office application with the VBA editor or use a specialized VBA decompiler.
Yes, VBA projects can be password-protected, which may prevent the detector from extracting macro names. If no macros are found but you suspect the document contains macros, the VBA project may be locked or use an unusual structure. The detector will note this in the findings.
There are no artificial file size limits. Since the tool processes files locally in your browser, the practical limit depends on your device memory. Most computers can handle documents up to several hundred MB. Large documents with many embedded objects may take slightly longer to analyze.
Absolutely. The Macro/VBA Detector processes everything locally in your browser using JavaScript. Your documents are never uploaded to any server - all ZIP parsing, VBA binary analysis, and macro detection happens on your device. This ensures complete privacy for sensitive or confidential documents.
Yes! 100% free with no signup, no account, no usage limits, and no hidden premium features. Scan as many documents as you need - completely free, forever. All processing is done in your browser with no server-side dependencies.