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index.js
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import * as parser from "@babel/parser";
import * as t from '@babel/types';
import traverse from '@babel/traverse';
import generate from '@babel/generator';
import beautify from 'js-beautify';
import { get } from 'axios';
import { writeFile, existsSync, mkdirSync } from 'fs';
async function fetchAkamaiScript(url) {
const res = await get(url);
return res.data;
}
// Regex for valid variable names (https://stackoverflow.com/a/9337047)
const validIdentifierRegex = 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function deobfuscate(source) {
const ast = parser.parse(source);
let lookupTable = [];
let stringArrName = undefined;
traverse(ast, {
/*
Unroll sequence statements into individual statements.
Akamai's obfuscation litters this pattern all over their codebase.
e.g: b.innerHTML = "abcdefhijklmnopqrstuvxyz1234567890;+-.", b.style.fontSize = "90px", b.style.fontFamily = o[c]
This transformation will turn it into:
b.innerHTML = "abcdefhijklmnopqrstuvxyz1234567890;+-."
b.style.fontSize = "90px"
b.style.fontFamily = o[c]
*/
SequenceExpression(path) {
if (path.parent && !t.isExpressionStatement(path.parent)) {
return;
}
path.parentPath.replaceWithMultiple(path.node.expressions.map(e => t.expressionStatement(e)));
},
/*
Akamai tends to flatten if statements into logical expressions.
This undoes that transformation.
e.g: e && e.pageX && e.pageY ? (n = Math.floor(e.pageX), o = Math.floor(e.pageY)) : e && e.clientX && e.clientY && (n = Math.floor(e.clientX), o = Math.floor(e.clientY));
turns into:
if (e && e.pageX && e.pageY) {
n = Math.floor(e.pageX);
o = Math.floor(e.pageY);
} else {
if (e && e.clientX && e.clientY) {
n = Math.floor(e.clientX);
o = Math.floor(e.clientY);
}
}
*/
LogicalExpression(path) {
if (!t.isExpressionStatement(path.parent)) {
return;
}
if(path.node.right.type === 'SequenceExpression'
|| path.node.right.type === 'AssignmentExpression'
|| path.node.right.type === 'CallExpression') {
path.parentPath.replaceWith(t.ifStatement(path.node.left, t.blockStatement([t.expressionStatement(path.node.right)]), null));
}
},
/*
Akamai uses void 0 to mean undefined sometimes.
They also use !0 as true and !1 as false.
This transforms them back into their respective meaning.
*/
UnaryExpression(path) {
if (path.node.operator === 'void' && path.node.argument.type === 'NumericLiteral') {
path.replaceWith(t.identifier("undefined"));
}
if (path.node.operator === '!' && path.node.argument.type === 'NumericLiteral') {
if (path.node.argument.value === 0) {
path.replaceWith(t.booleanLiteral(true));
} else {
path.replaceWith(t.booleanLiteral(false));
}
}
},
VariableDeclaration(path) {
// Find the variable that holds all the function
// and property names by finding the first array
// of strings. This is used as a lookup table by
// Akamai.
const functionNameMap = path.node.declarations.find(d => d.init && d.init.type === 'ArrayExpression' && d.init.elements.every(e => e.type === 'StringLiteral'));
if(functionNameMap && !stringArrName) {
// copy all of the values into a copy of the array
// so we can retrieve the proper function names later on
stringArrName = functionNameMap.id.name;
lookupTable = functionNameMap.init.elements.map(n => n.value);
// remove the variable from the code because it's
// useless once we recover all of the names.
path.replaceWith(t.noop());
}
},
MemberExpression(path) {
// If we find a MemberExpression who's object's name equals the
// lookup table replace it with the value retrieved from the array.
// e.g. var _ = ["cookie", "activeElement", ...]
// document[_[1]] -> document["activeElement"]
if(path.node.object.name === stringArrName) {
path.replaceWith(t.stringLiteral(lookupTable[path.node.property.value]));
}
}
})
// Do one more pass through the AST
// This changes all of the StringLiterals into Identifiers if it can.
// This helps us recover the dot operator for function calls
// and property access instead of array lookup.
// e.g.
// document["activeElement"] to document.activeElement
traverse(ast, {
MemberExpression(path) {
if(path.node.property.type === 'StringLiteral' && validIdentifierRegex.test(path.node.property.value)) {
path.replaceWith(t.memberExpression(path.node.object, t.identifier(path.node.property.value), false));
}
}
})
traverse(ast, {
/*
Make sure literals and undefined identifier is on the right in a binary expression.
undefined == a turns into a == undefined
0 == b turns into b == 0
*/
BinaryExpression(path) {
if(path.node.left.type === 'Identifier') {
if(path.node.left.name === 'undefined') {
path.replaceWith(t.binaryExpression(path.node.operator, path.node.right, path.node.left));
}
}
if(t.isLiteral(path.node.left)) {
path.replaceWith(t.binaryExpression(path.node.operator, path.node.right, path.node.left));
}
},
/*
Akamai sometimes defines multiple variables with one var keyword.
This gives them their own declaration.
e.g:
var bm_url = bm_script.src, url_split = bm_url.split("/"), obfus_state_field;
turns into:
var bm_url = bm_script.src;
var url_split = bm_url.split("/");
var obfus_state_field;
*/
VariableDeclaration(path) {
if (path.node.declarations.length > 1) {
path.replaceWithMultiple(path.node.declarations.map(d => t.variableDeclaration("var", [d])));
}
},
ConditionalExpression(path) {
if (t.isAssignmentExpression(path.parent) || t.isReturnStatement(path.parent)) {
return;
}
if(!t.isExpressionStatement(path.parent)) {
return;
}
path.parentPath.replaceWith(t.ifStatement(path.node.test, t.blockStatement([t.expressionStatement(path.node.consequent)]), t.blockStatement([t.expressionStatement(path.node.alternate)])));
path.parentPath.skip();
}
});
traverse(ast, {
LogicalExpression(path) {
if (!t.isExpressionStatement(path.parent)) {
return;
}
if(path.node.right.type === 'SequenceExpression'
|| path.node.right.type === 'AssignmentExpression'
|| path.node.right.type === 'CallExpression') {
path.parentPath.replaceWith(t.ifStatement(path.node.left, t.blockStatement([t.expressionStatement(path.node.right)]), null));
}
}
});
traverse(ast, {
SequenceExpression(path) {
if (path.parent && !t.isExpressionStatement(path.parent)) {
return;
}
path.parentPath.replaceWithMultiple(path.node.expressions.map(e => t.expressionStatement(e)));
},
UnaryExpression(path) {
if (path.node.operator === 'void' && path.node.argument.type === 'NumericLiteral') {
path.replaceWith(t.identifier("undefined"));
}
if (path.node.operator === '!' && path.node.argument.type === 'NumericLiteral') {
if (path.node.argument.value === 0) {
path.replaceWith(t.booleanLiteral(true));
} else {
path.replaceWith(t.booleanLiteral(false));
}
}
},
});
// Generate the new code given our modifications to the AST
// and beautify it to recover any indentation that may have
// been lost.
let deobfCode = generate(ast, {}, source).code;
deobfCode = beautify(deobfCode, {indent_size: 2, space_in_empty_paren: true});
writeCodeToFile(deobfCode);
}
function writeCodeToFile(code) {
if(!existsSync(__dirname + '/out')) {
mkdirSync(__dirname + '/out');
}
writeFile(__dirname + '/out/output.js', code, (err) => {
if(err) {
console.log('Error writing file', err);
} else {
console.log('Wrote file to /out/output.js');
}
});
}
// Fetch the Akamai URL from the arguments
// or use AMD's Akamai script as a default.
fetchAkamaiScript(process.argv[2] || 'https://www.amd.com/akam/11/796a4075')
.then(src => deobfuscate(src))
.catch(e => console.log(e));