Macro Security Checker
Upload any Office document (DOCX, XLSX, PPTX) to analyze its VBA macros for suspicious security patterns. Our Macro Security Checker scans the VBA source code against 50+ signatures across 7 categories - shell execution, network access, file system manipulation, code injection, auto-execute triggers, obfuscation techniques, and credential access. Each finding is rated by severity (Critical, High, Medium, Low) and contributes to an overall risk score (0-100). All processing runs locally in your browser for complete privacy - no signup required.
Upload any Office document (DOCX, XLSX, PPTX) to analyze VBA macros for suspicious security patterns. Detects shell execution, network access, file system manipulation, code injection, auto-execute triggers, obfuscation, and credential access - all processed locally in your browser.
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Supports DOCX, XLSX, and PPTX files
Why Use Our Macro Security Checker?
Deep VBA Pattern Analysis Across 7 Categories
Our Macro Security Checker scans VBA macro code against 50+ suspicious patterns organized into 7 security categories: Shell Execution, Network Access, File System Manipulation, Code Injection, Auto-Execute Triggers, Obfuscation, and Credential Access. Each pattern is matched against the actual VBA binary source code to accurately identify malicious behaviors.
Multi-Level Risk Scoring with Severity Ratings
Each detected pattern is classified as Critical, High, Medium, or Low severity based on its potential impact. The Macro Security Checker calculates an overall risk score (0-100) and labels the macro as Safe, Low, Medium, High, or Critical risk. Critical findings include Shell(), URLDownloadToFile, and PowerShell execution - patterns commonly found in malware payloads.
50+ Suspicious Pattern Signatures
The Macro Security Checker includes a comprehensive database of suspicious VBA patterns: WScript.Shell COM object creation, XMLHTTP/ServerXMLHTTP network requests, FileSystemObject operations, Eval/Execute dynamic code injection, Auto_Open/Workbook_Open auto-execute triggers, Chr() obfuscation routines, WMI queries, and credential access attempts. New patterns are detected through binary-level string extraction.
100% Private Browser-Based Analysis
Your documents never leave your device. All ZIP parsing, VBA binary decompression, pattern matching, and risk scoring runs locally in your browser using JavaScript. No document data is ever uploaded to any server - complete privacy for sensitive security analysis.
Common Use Cases for Macro Security Checker
Phishing Email Attachment Analysis
Security analysts investigating phishing campaigns can rapidly scan suspicious Office attachments for malicious VBA macros. The Macro Security Checker identifies critical patterns like URLDownloadToFile (payload downloader), WScript.Shell (command execution), and Auto_Open triggers - providing actionable intelligence within seconds.
Security Incident Response Triage
During incident response, quickly assess the risk level of macro-enabled documents found on compromised systems. The risk score (0-100) and severity breakdown help prioritize which macros require immediate reverse engineering versus those that are likely benign.
Malware Analysis & Reverse Engineering
Malware analysts can use the Macro Security Checker to get a quick overview of a macro's capabilities before deep diving into the VBA source code. The category breakdown (shell, network, file system, injection) reveals the macro's behavioral profile at a glance.
Enterprise Document Security Policy Enforcement
Organizations can screen all incoming macro-enabled documents against security policies. Automatically flag documents containing high-risk patterns like PowerShell execution, WMI queries, or file downloaders before they reach end users.
Cybersecurity Training & Awareness
Educators teaching malware analysis or email security can demonstrate how VBA macro malware works in practice. Show students how to identify suspicious patterns, understand risk scoring, and differentiate between benign macros and malicious payloads.
Forensic Document Examination
Digital forensic examiners analyzing evidence files can document the specific VBA macro patterns present in suspicious documents. The detailed pattern report with exact match snippets provides evidentiary-quality documentation for forensic reports.
Understanding VBA Macro Security Analysis
What is VBA Macro Security Analysis?
VBA Macro Security Analysis is the process of examining Visual Basic for Applications (VBA) code embedded in Office documents to identify potentially malicious behaviors. Unlike simple macro detection (which only confirms macros exist), security analysis goes deeper - it scans the actual VBA source code for patterns commonly associated with malware: shell command execution, network payload downloads, file system manipulation, code injection, and credential theft attempts. The Macro Security Checker automates this analysis by matching binary VBA project data against 50+ suspicious pattern signatures organized by category and severity.
How the Macro Security Checker Works
- Document Parsing: You upload an Office document (DOCX, XLSX, or PPTX) and the tool parses its ZIP-based internal structure to find all
vbaProject.binfiles - the binary containers that store compiled VBA macros. - VBA Binary Analysis: The tool decompresses DEFLATE-compressed VBA entries and extracts both macro names and the full VBA source text from the binary data using Latin-1 decoding and ASCII string extraction.
- Pattern Matching: The extracted VBA text is scanned against 50+ regex-based patterns organized into 7 security categories. Each match records the exact text snippet, severity level, and a human-readable description of the risk.
- Risk Scoring: Each pattern contributes to a weighted risk score (critical=25, high=15, medium=8, low=3). The total score (0-100) determines the overall risk classification: Safe, Low, Medium, High, or Critical.
Common Malicious VBA Pattern Categories
- Shell Execution: Patterns like Shell(), CreateObject("WScript.Shell"), PowerShell references, and cmd.exe strings indicate the macro can run arbitrary system commands - a hallmark of macro-based malware.
- Network Access: URLDownloadToFile, XMLHTTP, WinHttp, and hardcoded URLs suggest the macro downloads additional payloads from the internet or exfiltrates data.
- File System: FileSystemObject, CopyFile, DeleteFile, and GetTempName indicate the macro can read, write, copy, or delete files on the local system.
- Code Injection: Eval(), Execute(), ExecuteGlobal(), and CallByName allow the macro to run dynamically constructed code - commonly used to evade static analysis.
- Obfuscation: Chr() and Asc() functions used to build strings from character codes are a classic obfuscation technique designed to hide malicious strings from detection.
- Credential Access: Password references, WMI queries (Win32_*), and LogonUser calls suggest attempts to enumerate or steal credentials.
Privacy, Limitations & Responsible Use
The Macro Security Checker processes all documents entirely within your browser - no data is ever uploaded to any server. The tool analyzes VBA macros for suspicious patterns but does not decompile or display the actual VBA source code. It is designed as a triage and awareness tool, not a replacement for professional malware analysis. False positives and false negatives are possible - legitimate macros may use patterns like FileSystemObject for valid automation, and novel obfuscation techniques may evade detection. Always verify findings through additional analysis methods. The tool supports DOCX, XLSX, and PPTX formats (Office Open XML) and has no file size limits beyond your browser's available memory.
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Frequently Asked Questions About Macro Security Checker
A Macro Security Checker analyzes VBA macros embedded in Office documents (DOCX, XLSX, PPTX) and scans them for suspicious security patterns. It goes beyond simple macro detection by identifying specific malicious behaviors: shell command execution, network payload downloads, file system manipulation, code injection, auto-execute triggers, obfuscation techniques, and credential access attempts. Each pattern is categorized by severity with an overall risk score.
A regular macro detector only confirms that macros exist in a document. The Macro Security Checker goes much deeper - it scans the actual VBA macro code against 50+ suspicious pattern signatures, categorizes findings by behavior type (shell, network, file system, injection, obfuscation, credential access), assigns severity ratings, and calculates an overall risk score (0-100) with labels from Safe to Critical.
The tool 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 analysis runs locally in your browser with no file uploads to any server.
The most critical patterns include: Shell() function calls for arbitrary command execution, URLDownloadToFile for downloading malware payloads, WScript.Shell COM object creation for system command execution, PowerShell references for script-based attacks, Eval()/Execute() for dynamic code injection, and LogonUser for credential access. Any of these patterns alone warrants extreme caution.
The tool extracts and scans the VBA source strings from the binary VBA project file to detect suspicious patterns, but it does not display or decompile the full source code. The pattern match snippets are shown to provide context, but the complete VBA source is not reconstructed. For full code review, use a dedicated VBA decompiler or open the document in an Office application with the VBA editor.
The risk score (0-100) is a weighted calculation based on the severity of detected patterns: Critical (25 points each), High (15), Medium (8), and Low (3). A score of 80+ is Critical (immediate threat), 50-79 is High (significant risk), 25-49 is Medium (suspicious), 1-24 is Low (minor), and 0 is Safe (no suspicious patterns). The score helps prioritize which documents need urgent investigation.
Yes, VBA projects can be password-protected, which may prevent the Macro Security Checker from extracting and analyzing the macro source code. In this case, the tool will report that a VBA project was found but could not be analyzed. Password-protected VBA projects in suspicious documents are themselves a red flag and warrant further investigation.
Absolutely. The Macro Security Checker processes everything locally in your browser using JavaScript. Your documents are never uploaded to any server - all ZIP parsing, VBA decompression, pattern matching, and risk scoring 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. Analyze as many documents as you need - completely free, forever. All processing is done in your browser with no server-side dependencies.