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    Rewterz Threat Advisory -Multiple Microsoft Windows Products Vulnerabilties
    Severity High Analysis Summary CVE-2023-23410 CVSS:7.8 Microsoft Windows could allow a local authenticated attacker to gain elevated privileges on the system, caused by a flaw in […]

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    Rewterz Threat Alert -New Golang-Based Botnet GoBruteforcer Breaches Web Servers – Active IOCs
    Severity High Analysis Summary According to researchers, a Golang-based botnet named GoBruteforcer has been discovered, which is specifically targeting web servers running FTP, MySQL, phpMyAdmin, and […]
    March 15, 2023
    March 15, 2023
    Rewterz Threat Alert – DarkComet RAT (Remote Access Trojan) – Active IOCs
    Severity High Analysis Summary DarkComet RAT (Remote Administration Tool) is a type of malware that is designed to allow attackers to gain remote access to a […]
    March 15, 2023
    March 15, 2023
    Rewterz Threat Advisory -Multiple Microsoft Windows Products Vulnerabilties
    Severity High Analysis Summary CVE-2023-23410 CVSS:7.8 Microsoft Windows could allow a local authenticated attacker to gain elevated privileges on the system, caused by a flaw in […]

    Threat Insights

    16
    pdf-file (1)
    Annual Threat Intelligence Report 2022
    • Threat Advisories
    • Monthly Threat Insights
    • Threat Intelligence Reports
  • Why Rewterz?

    About Us

    Before Rewterz got its start, the market was in dire need of a specialized and dedicated information security company. It was nearly impossible for businesses to find a trustworthy provider that could truly cover all of their bases. We wanted to meet this need, giving companies across the globe a chance to get ahead while knowing that their data is in good hands.

    Read More

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    Our leadership team brings together years of knowledge and experience in cybersecurity to drive our company's mission and vision. Our team is passionate about delivering high-quality products and services, leading by example and assisting our clients in securing their organization’s environment.
    help

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    At Rewterz, we believe that businesses have a responsibility to impact positively and contribute to the well-being of our communities as well as the planet. That's why we are committed to operating in a socially responsible and sustainable way.

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Rewterz Threat Advisory – Microsoft Windows Server 2016 / Windows 10 Multiple Vulnerabilities
September 12, 2018
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Rewterz Threat Advisory – New ‘Brrr’ Variant of Dharma Ransomware released
September 17, 2018

Rewterz Threat Advisory – PyLocky ransomware using unique evasion tactics

September 13, 2018

Socially engineered spam emails have been identified delivering the PyLocky ransomware.

 

 

IMPACT: MEDIUM

 

PUBLISH DATE: 13-09-2018

 

OVERVIEW

 

A ransomware has been spotted by TrendMicro in Europe that tends to mimic the Locky ransomware. Named Pylocky, the ransomware features anti-machine learning capability and anti-sandboxing features. Therefore, it becomes notable due to the difficulty in its detection and analysis.

 

ANALYSIS

 

PyLocky’s has smart evasion techniques and it abuses legitimate tools that are mainly used by administrators. This makes it a very serious threat. The ransomware is written in Python and packaged with PyInstaller, a tool that turns Python applications into standalone executables.

 

The ransomware imitates Locky and other known ransomware families but is found unrelated to them. The researchers have also found that it also uses the open-source script-based Inno Setup Installer and can pose a real challenge to static analysis methods.

 

It was proliferated through socially-engineered malicious emails posing to relate to invoices. When a user follows the instruction to click the attached malicious URLs containing Pylocky, they will be redirected to a URL containing a ZIP file that drops malware components when executed.

 

The malware components will then proceed to encrypt a total of 150 file types (shown below) including images, videos, documents, sounds, programs, games, databases, archived files and other types of data on a user’s device. PyLocky iterates through each logical drive, generates a list of files, and then overwrites targeted files with an encrypted version.

 

A hardcoded list of file extensions seems to be the target of encryption for this ransomware. Furthermore, it seems to have been configured to abuse Windows Management Instrumentation (WMI) to check the properties of the affected system.

The ransomware possesses anti-sandbox capabilities that may make it sleep for 999,999 seconds or just over 11.5 days if the total visible memory size of the target system is less than 4GB.

 

Sand-box evasion techniques of Pylocky

 

After encrypting a system’s files, it generates an encryption key and proceeds to communicate with its command-and-control (C&C) server. The ransom note then dropped is multilingual, hinting at the broad term usage of this ransomware, finding targets across borders.

 

INDICATORS OF COMPROMISE

 

 

 

 

MITIGATION

 

With so many attack vectors available for the attackers, safeguarding your organization’s assets requires you to establish a multi-layered approach to security. Apply best practices like regularly backing up files, keeping the system updated, securing the use of system components and promoting a culture of cybersecurity awareness. Moreover, the threat indicators may help in blocking out certain security threats if used correctly.

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