KurayStealer Malware

There was an advertisement by a discord user with the handle “Portu” that exploded over the internet on April 23rd, 2022 for a new password-stealing malware builder.

It is a sort of program that enables so-called script kiddie hackers, to construct their own executables from scratch. Recently, the threats analysts at Uptycs have discovered, in the wild, the first sample of what they called KurayStealer, which had been based on the Portu-inspired malware.

This malware, KurayStealer has been used by the threat actors to target Discord users primarily.

Discovery

On 27 April 2022, the first sample of KurayStealer malware was detected by the Uptycs threat intelligence systems. 

Moreover, the cybersecurity researchers at Uptycs performed OSINT research in which they found that the threat actors have used YouTube to advertise this malicious builder for the first time on 23 April 2022.

Not only that even they also advertised this builder on Discord as well with the name or alias “Portu.” Python 3.0 (also known as Py3k or Python 3000) is the programming language the builder is written in.

The builder uses the command “wmic csproduct get UUID” to find the universally unique identifier for the product upon execution.

Apps Exploited to Harvest Passwords & Tokens

KurayStealer harvests the passwords and tokens from the following applications:-

  • Discord
  • Lightcord
  • Discord PTB
  • Opera
  • Opera GX
  • Amigo
  • Torch
  • Kometa
  • Orbitum
  • CentBrowser
  • 7Star
  • Sputnik
  • Vivaldi
  • Chrome SxS
  • Chrome
  • Epic Privacy Browser
  • Microsoft Edge
  • Uran
  • Yandex
  • Brave
  • Iridium

KurayStelaer OSINT

In KurayStelaer, you’ll find a number of components that combine to create a wide variety of password stealers that use the Discord tokens as both command and control (C2) channels and harvest all of the victim information.

Also included in the builder code was the link for the invite to the Discord channel for the creators of the builder.

A post is mentioned on the channel regarding the commercial version of this builder in different price ranges. Moreover, Portu’s Discord profile contains the names of two channels:-

  • A Shoppy link
  • A YouTube link

The author’s Shoppy profile for “Portu” was linked to additional tools and commercial offerings that are planned to build.

While the YouTube link contains the videos from the author, but, the YouTube video that was uploaded by the author has been deleted from the author’s channel.

Recommendations

Here below we have mentioned all the recommendations provided by the experts:-

  • Tight security controls
  • Multi-layered visibility
  • Robust security solutions
  • YARA process scanning capabilities
  • Multi-factor authentication

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