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In a recent report, researchers from Kaspersky Lab analyzed a hacker-for-hire group they dubbed DeathStalker that was seen targeting law offices, wealth consultancy firms and financial technology companies from several countries and continents.

The group is suspected of offering APT-style hacker-for-hire services to other entities, a growing and worrying trend thats changing the threat landscape.

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Evilnum appeared on the radar of security companies in 2018 when it started targeting FinTech companies throughout Europe with spear-phishing emails that try to pass malicious files as scans of credit cards, utility bills, ID cards, drivers licenses and other identity verification documents required by know-your-customer (KYC) regulations in the financial sector.

The emails included links to ZIP archives hosted on Google Drive that contained specially crafted Windows shortcut files (LNK) posing as JPG images.

The LNK files had malicious JavaScript code attached to them which, if executed, started an infection chain resulting in the deployment of a JavaScript-based Trojan.

Researchers from security firm Cybereason have recently observed some changes in Evilnums techniques.

Instead of multiple LNK files masquerading as pictures, the groups ZIP archives now contain a single LNK file that poses as a PDF document with scans of the required KYC documents.

This LNK file also has JavaScript attached to it, but the code only serves as a dropper and instead of a full-blown JavaScript-based Trojan, and it deploys a new malware program written in Python.

How the PyVil RAT works The new Python malware, dubbed PyVil RAT by Cybereason, provides hackers with several capabilities including.

Python is a scripting language thats popular with security professionals and hackers alike on Linux systems, but it does not execute natively on Windows and needs a separate runtime environment, similar to Java.

Python programs can be compiled directly into Windows executables that are self-contained, but because they have to include all the libraries usually provided by the runtime, their size ends up being quite large and this is something thats not appealing to malware authors.

Previous Evilnum attacks used a registry Run key to achieve persistence, but the new infection chain achieves this with a Windows Scheduled Task called the Dolby Selector Task.

The attackers hijack the name to make the scheduled task appear as if it was created by a legitimate system driver or component.

Similarly, the attackers use a Trojanized version of the legitimate Java Web Start Launcher program to execute malicious code, which then downloads the PyVil RAT.

This file manipulation breaks the original files digital signature by Oracle, but people are used to executing non-digitally signed files on Windows.

It seems that the Evilnum attackers have gone to great lengths to maintain persistence and stealth by impersonating a variety of legitimate programs that administrators might not find suspicious on a Windows system.

In the past, Evilnum configured its malware to only talk to command-and-control servers using IP addresses, not domain names.

However, Cybereason has detected a growing number of domains being associated with the IP addresses used by the Evilnum CC infrastructure during the past weeks, signaling a change in tactics as well as a growing infrastructure.

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The researchers also observed PyVil RAT downloading a custom version of an open-source password dumping tool called LaZagne, a post-exploitation tool thats written in Python and is popular with penetration testers.

Its code can be loaded directly into memory without touching the disk and can be used to extract passwords from many applications including browsers, chat programs, games, databases, sysadmin tools and more.

Evilnum attack patterns Evilnum displays various attack patterns that are associated with APT groups.

With all these different changes, the primary method of gaining initial access to their FinTech targets stayed the same: using fake know your customer (KYC) documents to trick employees of the finance industry to trigger the malware.

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