Reg Hive Parser

Introduction

Reg Hive Parser is an entirely JavaScript-based tool for parsing Windows Registry hive files, such as the NTUSER.dat file in the user prfiles, enhancing the security of the analysis process. The tool does not rely on any third-party libraries as dependencies. You can involve it in Node.js by using CommonJS or ESM. Furthermore, it is compatible with web browsers. To get a firsthand experience, simply click here.

The parser is implemented based on this format specification. We appreciate the hard work and dedication of the author, whose efforts have made this project possible.

NPM: see here.

Installation

npm install reg-hive-parser

Usage

CJS

const { parse } = require('reg-hive-parser')

;(async () => {
    const parsed = await parse('path/to/hive.dat', { recurse: true })
    console.log(parsed)
})()

ESM

import { parse } from 'reg-hive-parser'

;(async () => {
    const parsed = await parse('path/to/hive.dat', { recurse: true })
    console.log(parsed)
})()

Browser

<input type="file" />
<script src="./node_modules/reg-hive-parser/dist/index.umd.js"></script>
<script>
    const { parse } = regHiveParser
    const input = document.querySelector('input')
    input.addEventListener('change', e => {
        const file = e.target.files[0]
        const reader = new FileReader()
        reader.onload = async e => {
            const parsed = await parse(e.target.result, {
                recurse: false
            })
            console.log(parsed)
        }
        reader.readAsArrayBuffer(file)
    })
<script>

API

async parse(buffer, options)

Parses a Windows Registry hive file and returns a parsed object.

buffer

Type: String, ArrayBuffer (browser) or Buffer (nodejs)

If the argument is a String type, it represents the path of the hive file. Please note that this functionality is not supported in web browsers. If the argument is an ArrayBuffer (for browsers) or a Buffer (for Node.js), it corresponds to the content of the file data.

options

Type: Object

recurse

Type: Boolean

Default: false

If true, the parser will recursively parse subkeys. To efficiently parse large hive files, we recommend setting the recurse parameter to false in order to minimize latency.

simplify

Type: Boolean

Default: true

If set false, the parser returns the raw parsed object of each node. Here is the example.

{
  "signature": "regf",
  "primarySeqNum": 1446218,
  "secondarySeqNum": 1446218,
  "majVer": 1,
  "minVer": 5,
  "fileType": 0,
  "fileFormat": 1,
  "rootCellOffset": 32,
  "root": {
    "size": 88,
    "signature": "nk",
    "keyNameLength": 4,
    "classNameLength": 0,
    "keyNameString": "ROOT",
    "virtualControlFlags": {
      "number": 0,
      "dontVirtualize": false,
      "dontSilentFail": false,
      "recurseFlag": false
    }
    // ...
  },
  // ...
}

If set true, the parser simplifies the parsed object. Here is the example.

{
  "base": {
    "signature": "regf",
    "primarySeqNum": 1446218,
    "secondarySeqNum": 1446218,
    // ...
  },
  "root": {
    "type": "key",
    "name": "root",
    "children": [
      {
        "type": "key",
        "name": "AppEvents",
        "children": [
          // ...
        ]
      },
      {
        "type": "value",
        "name": "",
        "valType": "REG_SZ",
        "val": "Default Beep"
      }
      // ...
    ]
  }
}

Note: if the recurse parameter is set to false and the simplify parameter is set to true, the following behavior is observed:

1. For each simplified key node, the children property will always be an empty array.
2. For each simplified value node, the val property will always be null.
3. Each node will include a parse function.
4. Invoking the parse function on a key node will return the children of the key.
5. Invoking the parse function on a value node will return the data content of the value.

extra

Type: Function

Default: () => undefined

You have the flexibility to add any property that you are interested in to the simplified object. This allows you to include additional information or customize the structure according to your specific needs. By extending the simplified object, you can enhance its functionality and tailor it to suit your requirements. Here is the example.

await parse(e.target.result, {
    recurse: false,
    simplify: true,
    extra: raw => ({ signature: raw.signature })
})

This will add the signature property to each simplified object.

{
  "base": {
    // ...
  },
  "root": {
    "extra": {
        "signature": "nk"
    },
    "type": "key",
    "name": "root",
    "children": [
      {
        "extra": {
            "signature": "nk"
        },
        "type": "key",
        "name": "AppEvents",
        "children": [
          // ...
        ]
      },
      {
        "extra": {
            "signature": "vk"
        },
        "type": "value",
        "name": "",
        "valType": "REG_SZ",
        "val": "Default Beep"
      }
      // ...
    ]
  }
}

Lisence

This project is licensed under the MIT license.