Qrator-Privacy-Research/replace_qauth.js at main · botswin/Qrator-Privacy-Research · GitHub

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// @ts-check

const { JSDOM } = require('jsdom');
const traverse = require('@babel/traverse').default;
const parser = require('@babel/parser');

/**
 * deobfuscateCode: Simple and direct approach - find calls, match with results, replace with executed values
 *
 * @param {string} sourceCode - Original source code
 * @param {Array} originalResults - Analysis results from findAndResolveCalls
 * @param {string} exposedSourceCode - Source code with window assignments
 * @returns {Object} - { deobfuscatedCode: string, replacements: number, errors: Array }
 */
function deobfuscateCode(sourceCode, originalResults, exposedSourceCode) {
    console.log('🔄 Starting simple deobfuscation process...\n');

    // Create lookup map for quick access
    const resultsMap = new Map();
    originalResults.forEach((result) => {
        if (result.resolved && result.rootName) {
            const key = `${result.calleeName}-${result.arguments.number}-${result.arguments.string}`;
            resultsMap.set(key, result);
        }
    });

    console.log(`📋 Created lookup map with ${resultsMap.size} resolvable calls`);

    // Create JSDOM instance
    let dom;
    try {
        dom = new JSDOM(`<!DOCTYPE html><html><head><script>${exposedSourceCode}</script></head><body></body></html>`, {
            runScripts: 'dangerously',
            resources: 'usable',
        });
        console.log('✅ JSDOM created successfully');
    } catch (error) {
        console.error('❌ Failed to create JSDOM:', error.message);
        return { deobfuscatedCode: sourceCode, replacements: 0, errors: [error.message] };
    }

    const window = dom.window;
    let modifiedCode = sourceCode;
    let replacementCount = 0;
    const errors = [];

    // Parse AST and find all function calls
    try {
        const ast = parser.parse(sourceCode, {
            sourceType: 'module',
            plugins: ['jsx', 'typescript'],
            locations: true,
            allowImportExportEverywhere: true,
            allowReturnOutsideFunction: true,
        });

        // Collect all calls to replace (in reverse order to avoid position shifts)
        const callsToReplace = [];

        traverse(ast, {
            CallExpression(path) {
                const node = path.node;

                // Match our pattern: function(number, string)
                if (node.arguments.length !== 2) return;

                const [arg0, arg1] = node.arguments;
                if (arg0.type !== 'NumericLiteral' || arg1.type !== 'StringLiteral') return;
                if (node.callee.type !== 'Identifier') return;

                const calleeName = node.callee.name;
                const numValue = arg0.value;
                const strValue = arg1.value;

                // Check if we have this call in our results
                const key = `${calleeName}-${numValue}-${strValue}`;
                const matchedResult = resultsMap.get(key);

                if (matchedResult) {
                    callsToReplace.push({
                        start: node.start,
                        end: node.end,
                        calleeName,
                        numValue,
                        strValue,
                        rootName: matchedResult.rootName,
                    });
                }
            },
        });

        console.log(`🎯 Found ${callsToReplace.length} calls to replace`);

        // Sort by position (reverse order)
        callsToReplace.sort((a, b) => b.start - a.start);

        // Replace each call
        callsToReplace.forEach((call, index) => {
            try {
                const windowFuncName = `__${call.rootName}`;

                if (typeof window[windowFuncName] !== 'function') {
                    errors.push(`Function window.${windowFuncName} not found`);
                    return;
                }

                // Execute the function
                const result = window[windowFuncName](call.numValue, call.strValue);

                // Format result
                let formattedResult;
                if (typeof result === 'string') {
                    formattedResult = JSON.stringify(result);
                } else {
                    formattedResult = String(result);
                }

                // Replace in source code
                const before = modifiedCode.substring(0, call.start);
                const after = modifiedCode.substring(call.end);
                modifiedCode = before + formattedResult + after;

                replacementCount++;
                console.log(
                    `   ✅ [${index + 1}/${callsToReplace.length}] ${call.calleeName}(${call.numValue}, "${call.strValue}") → ${formattedResult}`
                );
            } catch (error) {
                const errorMsg = `Failed to execute ${call.calleeName}(${call.numValue}, "${call.strValue}"): ${error.message}`;
                errors.push(errorMsg);
                console.log(`   ❌ [${index + 1}/${callsToReplace.length}] ${errorMsg}`);
            }
        });
    } catch (parseError) {
        console.error('❌ Failed to parse source code:', parseError.message);
        errors.push(`Parse error: ${parseError.message}`);
    }

    // Clean up
    dom.window.close();

    console.log(`\n🎉 Deobfuscation complete: ${replacementCount} replacements applied`);

    return {
        deobfuscatedCode: modifiedCode,
        replacements: replacementCount,
        errors,
    };
}

/**
 * completeDeobfuscation: One-stop function for the entire process
 *
 * @param {string} sourceCode - Original source code
 * @param {Object} analysisResult - Result from analyzeAndExpose function
 * @returns {Object} - Complete deobfuscation results
 */
function completeDeobfuscation(sourceCode, analysisResult) {
    console.log('🚀 Starting complete deobfuscation workflow...\n');

    const { originalResults, exposedSourceCode, stats } = analysisResult;

    if (!originalResults || originalResults.length === 0) {
        console.log('❌ No analysis results provided');
        return {
            success: false,
            deobfuscatedCode: sourceCode,
            replacements: 0,
            errors: ['No analysis results provided'],
        };
    }

    const result = deobfuscateCode(sourceCode, originalResults, exposedSourceCode);

    const summary = {
        totalCallsFound: originalResults.length,
        resolvableCalls: originalResults.filter((r) => r.resolved).length,
        successfulReplacements: result.replacements,
        errors: result.errors.length,
        rootFunctionsUsed: stats ? Object.keys(stats.rootFunctions).length : 0,
    };

    console.log('\n' + '='.repeat(60));
    console.log('             DEOBFUSCATION COMPLETE');
    console.log('='.repeat(60));
    console.log(`📊 Summary:`);
    console.log(`   • Total calls found: ${summary.totalCallsFound}`);
    console.log(`   • Resolvable calls: ${summary.resolvableCalls}`);
    console.log(`   • Successful replacements: ${summary.successfulReplacements}`);
    console.log(`   • Failed executions: ${summary.errors}`);
    console.log(`   • Root functions used: ${summary.rootFunctionsUsed}`);
    if (summary.resolvableCalls > 0) {
        console.log(
            `   • Success rate: ${((summary.successfulReplacements / summary.resolvableCalls) * 100).toFixed(1)}%`
        );
    }
    console.log('='.repeat(60));

    return {
        success: summary.successfulReplacements > 0,
        deobfuscatedCode: result.deobfuscatedCode,
        replacements: result.replacements,
        errors: result.errors,
        summary,
    };
}

module.exports = {
    deobfuscateCode,
    completeDeobfuscation,
};