Cyber Security

Malicious NPM libraries set up ransomware, password stealer


Malicious NPM packages pretending to be Roblox libraries are delivering ransomware and password-stealing trojans on unsuspecting customers.

The 2 NPM packages are named noblox.js-proxy and noblox.js-proxies, and use typo-squatting to fake to be the professional Roblox API wrapper known as noblox.js-proxied by altering a single letter within the library’s identify.

Malicious noblox.js-proxies NPM
Malicious noblox.js-proxies NPM 

In a new report by open supply safety agency Sonatype with additional evaluation by BleepingComputer, these malicious NPMs are infecting victims with an MBRLocker ransomware that impersonates the notorious GoldenEye ransomware, trollware, and a password stealing trojan.

Each of the malicious NPM libraries have since been taken down and are not accessible.

A multitude of malicious exercise

After the malicious NPM libraries are added to a venture and launched, the library will execute a postinstall.js script. This script is often used to execute professional instructions after a library is put in, however on this case, it begins a sequence of malicious exercise on victims’ computer systems.

As you’ll be able to see beneath, the postinstall.js script is closely obfuscated to forestall evaluation by safety researchers and software program.

Obfuscated postinstall.js script
Obfuscated postinstall.js script

When executed, the script will launch the closely obfuscated batch file known as ‘nobox.bat,’ proven beneath.

Obfuscated noblox.bat batch file
Obfuscated noblox.bat batch file

This batch file was decoded by Sonatype safety researcher Juan Aguirre and can obtain quite a lot of malware from Discord and launches them with the assistance of the fodhelper.exe UAC bypass

The information downloaded by the noblox.bat batch file are listed beneath within the order they’re put in, together with their VirusTotal hyperlinks and an outline of their actions.

  • exclude.bat – Provides a Microsoft Defender exclusion to not scan information below the C: drive.
  • legion.exe – Deploys a password-stealing trojan that steals browser historical past, cookies, saved passwords, and makes an attempt to file video by way of the built-in webcam.
  • 000.exe – Trollware that modifies the present consumer’s identify to ‘UR NEXT,’ performs movies, modifications a consumer’s password, and makes an attempt to lock them out of their system.
  • tunamor.exe – Installs an MBRLocker known as ‘Monster Ransomware,’ which impersonates the GoldenEye ransomware.

The Monster ransomware MBRLocker

Of specific curiosity is the ‘tunamor.exe’ executable, which installs an MBRLocker calling itself ‘Monster Ransomware.’

When executed, the ransomware will carry out a compelled restart of the pc after which show a faux CHKDSK of the system. Throughout this course of, the ransomware is allegedly encrypting the disks on the pc.

Fake CHKDSK while drives are encrypted
Faux CHKDSK whereas drives are encrypted
Supply: BleepingComputer

When completed, it is going to reboot the pc and show a cranium and crossbones lock display initially discovered within the Petya/ GoldenEye ransomware households.

Monster ransomware lock screen
Monster ransomware lock display
Supply: BleepingComputer

After urgent enter, the sufferer is proven a display stating that their onerous disks are encrypted and that they need to go to the http://monste3rxfp2f7g3i.onion/ Tor website, which is now down, to pay a ransom.

Monster ransomware ransom demand
Monster ransomware ransom demand
Supply: BleepingComputer

BleepingComputer found the ‘qVwaofRW5NbLa8gj‘ string, which is accepted as a legitimate key to decrypt the pc. Nevertheless, whereas the secret is accepted and the ransomware states it’s decrypting the pc, Home windows will fail to begin afterward.

Windows unable to start after entering key
Home windows unable to begin after coming into key
Supply: BleepingComputer

It’s unclear if a further string should be added to that key to decrypt the onerous disk’s drive appropriately or if this program is just a wiper designed to destroy programs.

This ransomware doesn’t look like widespread and is just identified to be distributed by way of these NPM packages.

Based mostly on the exercise of the 000.exe trollware and the unusual conduct of the Monster ransomware, it’s possible that these packages are designed to destroy a system moderately than generate a ransom demand.

Malicious NPMs utilized in supply-chain assaults, akin to this one, have gotten extra widespread.

Sonatype recently discovered three malicious NPM libraries used to deploy cryptominers on Linux and Home windows units.

Final Friday, the very talked-about UA-Parser-JS NPM library was hijacked to contaminate customers with miners and password stealing trojans.




Password stealer


tunamor.exe (ransomware)

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