Information Gathering

SecretFinder – Find Sensitive Data (Apikeys, Accesstoken, JWT…)

June 17, 2020
3 Min Read
SecretFinder - A Python Script For Find Sensitive Data (Apikeys, Accesstoken, JWT...) And Search Anything On Javascript Files

[sc name=”ad_1″]

SecretFinder is a python script based on LinkFinder, written to discover sensitive data like apikeys, accesstoken, authorizations, jwt,..etc in JavaScript files. It does so by using jsbeautifier for python in combination with a fairly large regular expression. The regular expressions consists of four small regular expressions. These are responsible for finding and search anything on js files.
The output is given in HTML or plaintext.

Help

usage: SecretFinder.py [-h] [-e] -i INPUT [-o OUTPUT] [-r REGEX] [-b]
                       [-c COOKIE] [-g IGNORE] [-n ONLY] [-H HEADERS]
                       [-p PROXY]
optional arguments:
-h, --help show this help message and exit
-e, --extract Extract all javascript links located in a page and
process it
-i INPUT, --input INPUT
Input a: URL, file or folder
-o OUTPUT, --output OUTPUT
Where to save the file, including file name. Default:
output.html
-r REGEX, --regex REGEX
RegEx for filtering purposes against found endpoint
(e.g: ^/api/)
-b, --burp Support burp exported file
-c COOKIE, --cookie COOKIE
Ad d cookies for authenticated JS files
-g IGNORE, --ignore IGNORE
Ignore js url, if it contain the provided string
(string;string2..)
-n ONLY, --only ONLY Process js url, if it contain the provided string
(string;string2..)
-H HEADERS, --headers HEADERS
Set headers ("Name:ValuenName:Value")
-p PROXY, --proxy PROXY
Set proxy (host:port)

Installation
SecretFinder supports Python 3.

$ git clone https://github.com/m4ll0k/SecretFinder.git secretfinder
$ cd secretfinder
$ python -m pip install -r requirements.txt or pip install -r requirements.txt
$ python SecretFinder.py

Usage

  • Most basic usage to find the sensitive data with default regex in an online JavaScript file and output the HTML results to results.html:

python3 SecretFinder.py -i https://example.com/1.js -o results.html

  • CLI/STDOUT output (doesn’t use jsbeautifier, which makes it very fast):

python3 SecretFinder.py -i https://example.com/1.js -o cli

  • Analyzing an entire domain and its JS files:

python3 SecretFinder.py -i https://example.com/ -e

  • Ignore certain js file (like external libs) provided by -g --ignore

python3 SecretFinder.py -i https://example.com/ -e -g 'jquery;bootstrap;api.google.com'

  • Process only certain js file provided by -n --only:

python3 SecretFinder.py -i https://example.com/ -e -n 'd3i4yxtzktqr9n.cloudfront.net;www.myexternaljs.com'

  • Use your regex:

python3 SecretFinder.py -i https://example.com/1.js -o cli -r 'apikey=my.api.key[a-zA-Z]+'

  • Other options: add headers,proxy and cookies:

python3 SecretFinder.py -i https://example.com/ -e -o cli -c 'mysessionid=111234' -H 'x-header:value1nx-header2:value2' -p 127.0.0.1:8080 -r 'apikey=my.api.key[a-zA-Z]+'

add Regex

  • Open SecretFinder.py and add your regex:
_regex = {
    'google_api'     : r'AIza[0-9A-Za-z-_]{35}',
    'google_captcha' : r'6L[0-9A-Za-z-_]{38}|^6[0-9a-zA-Z_-]{39}$',
    'google_oauth'   : r'ya29.[0-9A-Za-z-_]+',
    'amazon_aws_access_key_id' : r'AKIA[0-9A-Z]{16}',
    'amazon_mws_auth_toke' : r'amzn.mws.[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}',
    'amazon_aws_url' : r's3.amazonaws.com[/]+|[a-zA-Z0-9_-]*.s3.amazonaws.com',
    'facebook_access_token' : r'EAACEdEose0cBA[0-9A-Za-z]+',
    'authorization_basic' : r'basics*[a-zA-Z0-9=:_+/-]+',
    'authorization_bearer' : r'bearers*[a-zA-Z0-9_-.=:_+/]+',
    'authorization_api' : r'api[key|s*]+[a-zA-Z0-9_-]+',
    'mailgun_api_key' : r'key-[0-9a-zA-Z]{32}',
    'twilio_api_key' : r'SK[0-9a-fA-F]{32}',
    'twilio_account_sid' : r'AC[a-zA-Z0-9_-]{32}',
    'twilio_app_sid' : r'AP[a-zA-Z0-9_-]{32}',
    'paypal_braintree_access_token' : r'access_token$produc   tion$[0-9a-z]{16}$[0-9a-f]{32}',
    'square_oauth_secret' : r'sq0csp-[ 0-9A-Za-z-_]{43}|sq0[a-z]{3}-[0-9A-Za-z-_]{22,43}',
    'square_access_token' : r'sqOatp-[0-9A-Za-z-_]{22}|EAAA[a-zA-Z0-9]{60}',
    'stripe_standard_api' : r'sk_live_[0-9a-zA-Z]{24}',
    'stripe_restricted_api' : r'rk_live_[0-9a-zA-Z]{24}',
    'github_access_token' : r'[a-zA-Z0-9_-]*:[a-zA-Z0-9_-][email protected]*',
    'rsa_private_key' : r'-----BEGIN RSA PRIVATE KEY-----',
    'ssh_dsa_private_key' : r'-----BEGIN DSA PRIVATE KEY-----',
    'ssh_dc_private_key' : r'-----BEGIN EC PRIVATE KEY-----',
    'pgp_private_block' : r'-----BEGIN PGP PRIVATE KEY BLOCK-----',
    'json_web_token' : r'ey[A-Za-z0-9-_=]+.[A-Za-z0-9-_=]+.?[A-Za-z0-9-_.+/=]*$',
    'name_for_my_regex' : r'my_regex',
    # for example
    'example_api_key' : r'^examplew+{10,50}'
}


[sc name=”ad-in-article”]

Tags