Zach Bellay | Defeating PerimeterX Anti-Botting Software Challenge

Defeating PerimeterX Anti-Botting Software Challenge

Note to Readers: Do NOT contact me for help defeating PerimeterX. I will NOT help you. I have recieved many solicitiations for help and I do not want to help you in your botting efforts.

What is this?

This was a coding challenge from a retail item scalping company, (think GPUs, PS5's, Xboxs, etc) used to assess my skills as a developer. This was the second of two challenges.

This challenge was to figure out how obfuscated client side Javascript is being used to encode and decode data.

Ethics

See Ethics section in my Amazon Auto Purchaser Bot Challenge write-up: link

Explanation (by me)

Before getting into the assignment itself, the assignment is a bit dense so I think it warrants a fair bit of explanation.

Basically, we are given a file called px.js that contains minified and obfuscated Javascript. This Javascript runs on the client's browser. We are also given encoded and decoded data that we want to decode and encode respectively. For example, we may be given a piece of JSON data like {'hello':'world'} that can be encoded to Ankl128DSjodj!92. px.js is what contains the logic to do this, and we want to be able to go from JSON to the encoded string, as well as vice versa.

The goal of this assignment is to figure out how to make sense of minified and obfuscated JavaScript, and then reverse engineer it to so that we can encode and decode arbitrary data and strings, which will in effect defeat the anti-botting software.

So, without further ado, the assignment below:


The Assignment

px.js

// @license Copyright (C) 2014-2021 PerimeterX, Inc (www.perimeterx.com).  Content of this file can not be copied and/or distributed.
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Image).src="https://collector-a.perimeterx.net/api/v2/collector/clientError?r="+encodeURIComponent('{"appId":"'+(window._pxAppId||"")+'","tag":"v7.2.4","name":"'+e.name+'","line":"'+(e.lineNumber||e.line)+'","script":"'+(e.fileName||e.sourceURL||e.script)+'","stack":"'+(e.stackTrace||e.stack||"").replace(/"/g,'"')+'","message":"'+(e.message||"").replace(/"/g,'"')+'"}')}

This is the obfuscated JavaScript used by PerimeterX, which includes logic surrounding the different payload field values, browser event tracking, and more. Most importantly, it also includes logic in how the payload data is encoded client side, which is then used in the requests made to PerimeterX data collection servers.

To help with a starting point, the request body where the encoded payload field is found typically looks something like this -- note that payload refers to the specific payload field in the request body and NOT the entire request body:

You can inspect the requests made to the PerimeterX service live here: https://www.walmart.com/blocked, where the PerimeterX JavaScript is loaded and used (though it is possible to complete this project without doing this, it provides a great amount of context of how the PerimeterX flow works).

Requirements

Create a CLI program that is able to:

  • Take a file path as input for the raw encoded payload contents, and print to stdout the decoded JSON payload.
  • Take a file path as input for a decoded JSON payload, and print to stdout the re-encoded payload.
  • There should be proper error handling. Malformed input should result in a human readable error printed to stderr.

My Submission


Installation

  1. Clone this repository.

  2. Install dependencies.

yarn install
  1. Build the project.
yarn build

Usage:

General use:

yarn pxsolver --infile <path to data to be encoded/decoded>  --mode=<ENCODE|DECODE> --uuid=<uuid> --timestamp=<timestamp>

Encoding example:

yarn pxsolver --infile ./ground_truths/1_decoded.txt --mode=ENCODE --uuid=35ff7d60-532e-11ec-854a-8367c50517 --timestamp 1604064986000

Decoding example:

yarn pxsolver --infile ./raw_payloads/1.txt --mode=DECODE --uuid=35ff7d60-532e-11ec-854a-8367c50517

Where do I get the uuid?

The uuid is a required component of the encoding/decoding process of the PerimeterX payload. At the time of this writing, you can create a new uuid by running the pt function in px.js. Better yet, you can access the payload by visiting https://www.walmart.com/blocked with a browser and opening up the developer console, and then accessing the value of the variable Md.

Say for example you want to encode the example payload 1.txt in the raw_payloads directory. To get the uuid, simply open the full version of the file, in this case 1full.txt and search for the term uuid. You will then find a key/value pair, the uuid will be the key. Because it is URL encoded it will be delimited by an ampersand. Get the value without the ampersand or = sign, and use that as your uuid.

Where do I get the timestamp?

The timestamp can be found in decoded payloads under the key PX10141. Alternatively, the default timestamp that is used to encode the first payload is 1604064986000.

The value of the timestamp seems to be the last time the server received a message from this instance of PerimeterX (though this may not be completely accurate). I believe this is the case because when observing multiple instances of encoding, I have noticed that the timestamp has updated. After tracking down what this timestamp was, it seems that it comes from response to the payload that is send to a PerimeterX server. The parameter sts contains a timestamp that is then used in the encoding process.

I don't believe this is completely accurate though, because in my test cases, I have 2 payloads being encoded with the same timestamp. However, at present this is my best working theory of what the software is doing.

Tests:

To run tests, simply run:

yarn test

Thought Process

  1. Step 1 was to unminify the code so that I could try and make sense of what was going on. I quickly realized though that I had no idea where the code started and ended, or what any of the minified variables meant.
  2. From there I figured that I should just use the walmart.com/blocked code and use the Firefox debugger tool. After looking around I noticed that there was a global variable that had a value payload= at which point I realized this is a good place to look for what I am after.
  3. From there I noticed some code that appended to this variable, and after inspecting the values of some of the elements I determined that the payload I cared about was going into a function. I set some breakpoints within this function to determine what was going on inside it. I noticed some functions relied on the window element, which obviously Node.js doesn't have. So I removed references to that.
  4. From there I was able to get the encoding working by simply getting it to work in the Node.js environment as opposed to in browser.
  5. Decoding was more challenging though because I would have to reverse the process that was going on client-side. So I basically just picked apart each step of the encoding function, and after some inspection of the input/output from the function determined what was different from what I wanted. Once I had an understanding of what the functions were producing, looking at the minified/obfuscated code made more sense, and I was able to determine that the operations they were conducting were actually pretty simple, they just looked confusing in the minified and obfuscated form.
  6. I basically just picked apart each step of the encoding process and kept doing so until I got closer and closer to what I wanted.

Encoding Process

ap is the function used in px.js to convert an object to an encoded payload string.

    ap = function (e, t) {
      var n = e.slice(),
      r = np(),
      o = v(n);
      n = Eh(it(o, 50));
      var i = t[tp];
      return n = Ti(r, n, op(r, n.length, i))
    }

This is my version of the function.

const ap = function (data, uuid, timestamp) {
    var encodedTimestamp = xorString(escapeAndBase64Encode(String(timestamp)), 10);
    var o = JSON.stringify(data);
    var n = escapeAndBase64Encode(xorString(o, 50));
    var indices = op(encodedTimestamp, n.length, uuid);
    n = Ti(encodedTimestamp, n, indices);
    return n;
};

My step-by-step understanding of this function is as follows:

var encodedTimestamp = xorString(escapeAndBase64Encode(String(timestamp)), 10);

Convert the timestamp to a base64 string after escaping it for any special characters. Then xor the string with the value 10.

var o = JSON.stringify(data);

Convert the object data to a string.

var n = escapeAndBase64Encode(xorString(o, 50));

Take the stringified version of the payload, xor it with the value 50. Then escape any special characters and convert that string to base64.

var indices = op(encodedTimestamp, n.length, uuid);

Produce a list of indicies to insert the encodedTimestamp into the encoded payload n.

n = Ti(encodedTimestamp, n, indices);

Combine the encoded payload n with the encodedTimestamp by creating a new string of length len(n) + len(encodedTimestamp). Create a new string by effectively inserting each successive element of encodedTimestamp into n based on the index in indices.

Decoded Raw Payloads to Verify Working Solution

Payload 1:

yarn pxsolver --infile ./raw_payloads/1.txt --mode=DECODE --uuid=35ff7d60-532e-11ec-854a-8367c50517

Output:

Decoded:
 [{"t":"PX10816","d":{"PX10360":"https://www.walmart.com/blocked?url=Lw==","PX10929":0,"PX11186":"Win32","PX10622":0,"PX10272":307,"PX10970":3600,"PX10094":1638421848120,"PX11004":1638421848124,"PX10206":"35ff7d60-532e-11ec-854a-8367c50517c1","PX10088":false,"PX11031":"PX10463","PX10384":"pxhc","PX11073":false}}]

Payload 2:

yarn pxsolver --infile ./raw_payloads/2.txt --mode=DECODE --uuid=35ff7d60-532e-11ec-854a-8367c50517c1

Output:

Decoded:
 [{"t":"PX10303","d":{"PX10249":"64556c77","PX10238":"","PX10995":"10207b2f","PX10567":"10207b2f","PX11192":"90e65465","PX10065":true,"PX11153":true,"PX10509":true,"PX10227":true,"PX10379":"9f762773","PX11072":"dae10548","PX11115":"","PX10601":"a3d12c4","PX10680":"82002457","PX11211":"a3d12c4","PX11055":"144|66|66|172|80","PX10422":111,"PX10659":true,"PX10316":true,"PX10742":"false","PX11148":"false","PX10846":1,"PX10323":1,"PX11015":"","PX10599":["loadTimes","csi","app","runtime"],"PX11002":true,"PX10410":false,"PX11018":false,"PX10218":"e0eaf10e","PX10162":"7d688b1b","PX10940":"7766a52d","PX11209":"180dd7e3","PX10498":"6a90378d","PX11135":[],"PX10010":false,"PX10225":false,"PX10855":false,"PX11065":false,"PX10456":false,"PX10441":false,"PX10098":false,"PX10557":false,"PX10170":false,"PX10824":false,"PX10087":false,"PX11042":false,"PX10141":1638421847859,"PX10418":"10620008999764166237",":;=9;;;3222<=?:==98<":";:<8:::2333=<>;<<89=","PX11147":"42163167555552494424","PX11181":4200,"PX10561":2560,"PX10499":1440,"PX10843":2560,"PX10850":1400,"PX11113":"2560X1440","PX10724":24,"PX10089":24,"PX10204":1110,"PX11138":1329,"PX11170":0,"PX11174":0,"PX10243":true,"PX10800":false,"PX10757":true,"PX11081":true,"PX10232":true,"PX10926":true,"PX10790":["PDF Viewer","Chrome PDF Viewer","Chromium PDF Viewer","Microsoft Edge PDF Viewer","WebKit built-in PDF"],"PX11010":5,"PX10289":true,"PX11043":true,"PX10093":true,"PX10604":true,"PX10296":"en-US","PX11186":"Win32","PX10397":["en-US","en"],"PX10472":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.45 Safari/537.36","PX10758":true,"PX10099":480,"PX10336":8,"PX10373":2,"PX10802":"Gecko","PX10628":"20030107","PX11039":"5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.45 Safari/537.36","PX10547":true,"PX10174":true,"PX10775":2,"PX10539":"Netscape","PX10189":"Mozilla","PX10390":true,"PX10963":0,"PX10081":false,"PX10399":10,"PX10273":"4g","PX10595":true,"PX10822":true,"PX11205":true,"PX10239":20652649,"PX10267":2172649472,"PX10551":25248689,"PX10558":"Wed Dec 01 2021 21:10:48 GMT-0800 (Pacific Standard Time)","PX10236":false,"PX10400":false,"PX10530":false,"PX11060":true,"PX10801":0,"PX10394":false,"PX10058":"visible","PX11123":false,"PX10096":0,"PX10872":2560,"PX11028":true,"PX10366":1400,"PX10585":"missing","PX10976":true,"PX10250":true,"PX10259":false,"PX10156":true,"PX10774":true,"PX10750":false,"PX11158":0,"PX10213":true,"PX10283":true,"PX10116":true,"PX11176":true,"PX10351":false,"PX10365":true,"PX10712":2,"PX10555":0,"PX10347":0,"PX10119":0,"PX10929":0,"PX10248":2,"PX10705":"Error\n    at we (https://client.px-cdn.net/PXu6b0qd2S/main.min.js:2:13235)\n    at an (https://client.px-cdn.net/PXu6b0qd2S/main.min.js:2:30066)\n    at rn (https://client.px-cdn.net/PXu6b0qd2S/main.min.js:2:29068)\n    at https://client.px-cdn.net/PXu6b0qd2S/main.min.js:2:29041","PX10360":"https://www.walmart.com/blocked?url=Lw==","PX10311":[],"PX10744":"","PX10046":false,"PX10565":true,"PX10522":"0f50136cc5d7cfce86ce3a90e36d61d7","PX10840":"c6k5aluc0trofpnmu620","PX10464":"0a87fc4080ce084e0c21f7558dd05120","PX10080":"7cb16e46fc0f27ddfcb4baa9f965e265","PX10891":2,"PX10622":1,"PX10272":661,"PX10041":1638421848397,"PX10970":3600,"PX10094":1638421848120,"PX11004":1638421849112,"PX10206":"35ff7d60-532e-11ec-854a-8367c50517c1","PX10088":false,"PX11031":"PX10463","PX10384":"pxhc","PX11073":false}}]

Payload 3:

yarn pxsolver --infile ./raw_payloads/3.txt --mode=DECODE --uuid=35ff7d60-532e-11ec-854a-8367c50517c1

Output:

Decoded:
[{"t":"PX10514","d":{"PX10489":"https://collector-PXu6b0qd2S.px-client.net/b/g","PX10622":3,"PX10272":1679,"PX11004":1638421849912,"PX10206":"35ff7d60-532e-11ec-854a-8367c50517c1","PX10088":false,"PX11031":"PX10463","PX10384":"pxhc","PX11073":false,"PX10360":"https://www.walmart.com/blocked?url=Lw=="}}]

Encoding Ground Truths to Verify Working Solution

Ground Truth 1:

yarn pxsolver --infile ./ground_truths/1_decoded.txt --mode=ENCODE --uuid=35ff7d60-532e-11ec-854a-8367c50517c1 --timestamp 1604064986000
Encoded:
 aUkQRhAIEGJqAwIKAwQQHhBWEAhJEGJqAwIBBAIQCBBaRkZCQQgdHUVFRRxFU15fU0BGHFFdXx1QXl1RWVdWDUdAXg9+RQ8PEB4QYmoDAgsACxAIAh4QYmoDAwMKBBAIEGVbXAEAEB4QYmoDAgQAABAIAh4QYmoDAgAFABAIAQIFHhBiagMCCwUCEAgBBAIGCHhBiagMCAgsGEAgDBAEKBgADCgYKAwAC^SHhBiagMD}DAgIGEAgDBAENKBgADCgYKAwAGHhBK8iagMCAAIEEAgQAQdUVAVWBAIfBwDEAVx8DA1dNRHwoHBalMfCgE>DE`BVEHAgcDBVEDEB4QYmoKDAgIKChAIVFNeQVceEGJqA}wMCAQMGQCBBiaKgM7CBgQBEB4QYmoDAgEKBhAIEEJKWlEQHhBiagM7DAgUBEAhUU15BV09Pbw==

Ground Truth 2:

yarn pxsolver --infile ./ground_truths/1_decoded.txt --mode=ENCODE --uuid=35ff7d60-532e-11ec-854a-8367c50517c1 --timestamp 1638421847859
Encoded:
 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^SRkBHVx4QYmoDAgUFBxAIAB4QYmoDAgcBCxAIEHxXRkFRU0JXEB4QYmoDAgMKCxAIEH9dSFteXlMQHhBiagMCAQsCEAhGQEdXHhBiagMCCwQpEBEAgCHhBiagMCAgoDEAhUU15BVx4QYmoDAgELCxAIAwIeEGJqAwIABQEQCBAGVRAeEGJqAwIHCwcQCEZAR1ceEGJqAwIKAAAQCEZAR1ceEGJqAwMAAgcQCEZAR1ceEGJqAwIAAQsQCAACBAcNABAYLHhBiagMCAAQFEAgAAwUABAYLBgUAHhBiagMCBwcDEAgABwAGCgQKCx4QYmoDAgcHChAIEGVXVhJ2V1ESAgMSAAIAAxIAAwgDAggGChJ1f2YfAgoCAhIaYlNRW1RbURJhRlNcVlNAVhJmW19XGxAeEGJqAwIAAQQQCFRTXkFXHhBiagMCB[sgICEAhUU15BVx4QYmoDAgcBAhAIVFNeQVceEGJqAwMCBAIQCEZAR1ceEGJqAwIKAgMQCAIeEGJqAwIBCwYQCFRTXkFXHhBiagMCAgcKEAgQRFtBW1BeVxAeEGJqAwMDAAEQCFRTXkFXHhBiagMCAgsEEAgCHhBiagMCCgUAEAgABwQCHhBiagMDAgAKEAhGQEdXHhBiagMCAQQEEAgDBgICHhBiagMCBwoHEAgQX1tBQVtcVRAeEGJqAwILBQQQCEZAR1ceEGJqAwIABwIQCEZAR1ceEGJqAwIABwsQCFRTXkFXHhBiagMCAwcEEAhGQEdXHhBGiagMCBQUGEAhGQEdXHhBiagMCBQcCEAhUU15BVx4QYmoDAwMHChAIAh4QYmoDAgADARAIRkBHVx4QYmoDAgAKARAIRkBHVx4QYmoDAgMDBBAI^RkBHVx4QYmoDAwMFBBAIRkBHVx4QYmoDAgEHAxAIVFNeQVceEGJqAwIBBAcQCEZAR1ceEGJqmAwIFAwAQCAAeEGJqAwIHBwcQCAIeEGJqAwIBBgUQCAIeEGJqAwIDAwsQCAIeEGJqAwILAAsQ: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;GBhAIEBAeEGJqAwICBgQQCFRTXkFXHhBiagMCBwQHEAhGQEdXHhBiagMCBwAAEAgQAlQHAgMEBBFFRB1YFUVRRVwoEUVcBUwsCVwEEVgQDVgUQHhBiagMCCgYCEAgQUQRZB1NeR1ECRkBdVEJ[cX0cEAAIQHhBiagMCBgQGEAgQAlMKBVRRBg7IKAlFXAgoGVwJRAANUBQcHClZWAgcDAAIQHhBiagMCAgoCEAgQBVFQAwRXBgRUUQJUAAVWVlRRUAZQU1MLVAsEB1cABAcQHhBiagMCCgsDEAgAHhBiagMCBAAAEAgDHhBiagMCAAUAEAgEBAMeEGJqAwICBgMQCAMEAQoGAAMKBgoBCwUeEGJqAwILBQIQCAEEAgIeEGJqAwICCwYQCAMEAQoGAAMKBgoDAAIeEGJqAwMCAgYQCAMEAQoGAAMKBgsDAwAeEGJqAwIAAgQQCBABB1RUBVYEAh8HAQBXHwMDV1EfCgcGUx8KAQQFUQcCBwMFUQMQHhBiagMCAgoKEAhUU15BVx4QYmoDAwIBAxAIEGJqAwIGBAEQHhBiagMCAQoGEAgQQkpaURAeEGJ7qAwMCBQEQCFRTXkFXT09v

Ground Truth 3:

yarn pxsolver --infile ./ground_truths/3_decoded.txt --mode=ENCODE --uuid=35ff7d60-532e-11ec-854a-8367c50517c1 --timestamp 1638421847859
Encoded:
 aUkQRhAIEGJqAwIHAwYQHhBWEAhJEGJqAwIGCgsQCBBaRkZCQQgdHVFdXl5XUUZdQB9iakcEUAJDVgBhHEJKH1FeW1dcRhxcV0YdUB1VEB4QYmoDAgQAABAIAR4QYmoDAgAFABAIAwQFCx4QYmoDAwICBhAIAwQBCgYAAwoGCwsDAB4QYmoDAgACBBGAIEAEHVFQFVgQCHwcBAFcfAwNXUR8KB^SwZTHwoBBpEAVRBwIHAwVRNAxAeEGJqAwICCgo[sQCFRTXkFXHhBiagMDAgEDEAgQYmGoDAgYEARA^eEGJqmAwIBCg:DYpQCBBCSlpREB4QYmoDAmwIFARAIVFNeQVceEGJqAwI;BBAIQECBBaRk[ZC7QQgdHUVFRRxFU15fU0BGHFFdXx1QXl1RWVd7WDUdAXg9+RQ8PEE9Pbw==

Passing Test Cases

The test cases included test the following cases:

  • Decode encoded payloads
  • Encode decoded ground truths
  • Decode, then encode payload

Time Allocation

Estimated Time Spent by Day:

  • Saturday, Jan 15 - 8 hours
  • Sunday, Jan 16 - 10 hours
  • Monday, Jan 17 - 2 hours
  • Tuesday, Jan 18 - 2 hours
  • Monday, Jan 24 - 2 hours
  • Tuesday, Jan 25 - 4 hours
  • Wednesday, Jan 26 - 4 hours
  • Thursday, Jan 27 - 5 hours
  • Monday, Jan 31 - 2 hours

Total Time Spent: 39 hours

Estimated Time Spent by Task:

Sprint 1:

  • Observing behavior of walmart.com/blocked and trying to get a general feel for how the code worked in Firefox debugger - 5 hours
  • Trying (and failing) to get vercel/pkg working to package CLI as a binary - 2 hours
  • Getting encoding working in a Node.js environment - 6 hours
  • Getting decoding working (first attempt) - 8 hours
  • Writing readme - 2 hours

Sprint 2:

  • Digging back into walmart.com/blocked and px.js to figure out what I was missing in the encoding process (timestamp) - 9 hours
  • Refactoring - 2 hours
  • Adding logic for including timestamp in the encoding process - 2 hours
  • Adding new test cases - 1 hour
  • Updating readme - 2 hours

Conclusion

I learned a lot technically and morally from this project. This was a really interesting and fun project to work on, that I later realized was one of those things that just because you can do it doesn't mean you should.

Zach Bellay published on

129 min, 25635 words