Visualization Archives

Tech Optimizer

August 23, 2025

How to load test PostgreSQL database and not miss anything

Practitioners face challenges during load testing of Tantor Postgres databases using pgbench, primarily due to insufficient documentation of the testing environment, leading to non-representative results and the need for repeated tests. The pg_perfbench tool has been developed to address these issues by ensuring repeatability, safeguarding data, and simplifying result comparisons through a cohesive template. It automates pgbench execution, collects metadata about the testing environment, and generates structured reports. pgbench operates on a TPC-B model, providing performance metrics such as transactions per second (tps), average latency, and the number of processed and failed transactions. A Bash script can be used to automate pgbench tests with varying client numbers, logging results into separate files. The pg_perfbench tool captures extensive data regarding the database environment and generates reports that include system properties, common database information, benchmark details, and test results. It facilitates the comparison of multiple load test results and ensures that environments being compared are consistent in terms of PostgreSQL versions and system parameters. The tool also allows for the evaluation of performance impacts from changes to PostgreSQL settings by generating separate reports for different configurations. It verifies compliance of specified parameters before joining reports, ensuring accurate comparisons. The final reports are structured in JSON and HTML formats, enhancing analysis and collaboration efforts.

AppWizard

August 8, 2025

Epic Games store’s massive update: You can grab $45worth in free games for a limited period of time

The Epic Games Store is offering two free PC games until August 14. The first game is Road Redemption, an action racing game developed by Redemption Road and Pixel Dash Studios, published by Tripwire Presents, released in 2019, and typically retails for .99. It has an 82% approval rating from over 10,000 user reviews on Steam. The second game is 112 Operator, a simulation and strategy game developed by Jutsu Games and published by Games Operators, released in 2020, and normally costs .99. It has an 89% approval rating from over 5,000 user reviews on Steam.

Winsage

August 4, 2025

Malware disguises itself as an innocent photo on Dropbox. APT37’s steganographic strategy

Specialists at the Genians Security Center have identified a new version of the RoKRAT malware linked to the North Korean APT37 group. This version uses steganography to hide its code in JPEG images, allowing it to bypass antivirus systems. The infection begins with a malicious .LNK link in a ZIP archive, which contains a large .LNK file that misleads users. The malware employs various encrypted components, including shellcode, PowerShell scripts, and batch files. Upon execution, PowerShell decrypts the shellcode using a XOR operation, and the malware injects itself into legitimate Windows processes without leaving traces on the disk. The RoKRAT loader is embedded in a JPEG image hosted on Dropbox, and it uses a double XOR transformation to extract the shellcode. The malware is activated through sideloading techniques using legitimate utilities and downloads from cloud platforms. RoKRAT can collect data, take screenshots, and transmit them to external servers. Recent samples have targeted “notepad.exe” for code injection, indicating ongoing development. Endpoint detection and response (EDR) systems are essential for monitoring unusual activities and protecting against these sophisticated attacks, as traditional defenses are inadequate.

Winsage

August 4, 2025

North Korea Hiding Malware Within JPEG Files to Attack Windows Systems Bypassing Detections

Security researchers at Genians Security Center discovered a new variant of the RoKRAT malware linked to the North Korean APT37 threat group. This malware uses steganography to hide malicious payloads within JPEG files, allowing it to evade traditional antivirus detection. It is typically distributed through malicious shortcut files within ZIP archives, often disguised as legitimate documents. The malware employs a two-stage encrypted shellcode injection method, utilizing PowerShell and batch scripts to execute its payloads in memory. It collects system information, documents, and screenshots, exfiltrating data via compromised cloud APIs. The command and control accounts associated with the malware are linked to Russian email services. Variants of RoKRAT have evolved to include different injection methods and reference specific PDB paths. Indicators of compromise include various MD5 hashes associated with the malware.

AppWizard

July 5, 2025

I wouldn’t be able to use my gaming PC without this one mod

Special K is a versatile utility for PC gaming that enhances gameplay across various titles. It features a frame rate limiter that improves consistency, surpassing Nvidia's built-in limiter in minimum frame rates during tests. Special K allows users to force games into borderless or exclusive fullscreen modes, enable Nvidia Reflex, adjust DLSS settings, and link input devices to specific applications. It also addresses HDR support issues by enabling HDR injection in games that lack native support, with extensive customization options for HDR settings. Originally developed to fix problems in PC ports like Fallout 4 and Batman: Arkham Knight, it has evolved to optimize a wide range of games, including Elden Ring, Monster Hunter: World, and Final Fantasy VII Remake. Special K has limitations with online games due to anti-cheat concerns but is highly applicable for single-player titles. The introduction of the SKIF GUI has made it more accessible for users.

Tech Optimizer

June 30, 2025

Supercharging AWS database development with AWS MCP servers

The Model Context Protocol (MCP) facilitates integration between AI systems and various data sources, including databases, APIs, and business applications. AWS has released open-source MCP servers for Amazon Aurora, Amazon DynamoDB, and Amazon ElastiCache to enhance developer productivity by allowing AI-assisted tools to access structured metadata. MCP standardizes connections between AI assistants and external environments, enabling intelligent suggestions and context-aware query assistance. Traditional development challenges include time spent on boilerplate queries and context switching between different database technologies, which MCP aims to alleviate. The MCP servers provide secure access to structured metadata and streamline the development process by integrating database context directly into development environments. Developers can utilize these servers to generate tests based on live metadata, monitor database performance, and troubleshoot issues efficiently. The MCP servers are available for local deployment using Docker and can be configured for various AWS database services.

AppWizard

June 25, 2025

Minecraft Clone Manages With Nothing But HTML + CSS

Benjamin Aster has created a 3D Minecraft clone using only CSS and HTML, without any JavaScript. The project consists of approximately 40,000 lines of HTML and fewer than 500 lines of CSS. Each block in the 9x9x9 world is represented by a combination of HTML elements, with CSS managing the display based on user interactions. Users can click on blocks to change their types, which alters the visible labels. The 3D effect is achieved through CSS animations that can be controlled by the user. The complete code is available on GitHub.

Winsage

June 21, 2025

This open-source tool gave me the Windows desktop I’ve always wanted

JaxCore is an open-source suite designed to enhance the Windows 11 experience through customization. It operates as a collection of plugins and tools built on the Rainmeter platform, providing users with various widgets for their desktops. JaxCore simplifies the customization process with pre-made tools and allows for deeper customization for those familiar with coding. The suite includes modules like YourFlyouts, YourMixer, ValliStart, Keylaunch, and IdleStyle, as well as widgets such as ModularVisualizer, ModularClocks, ModularPlayers, and Plainext. Although JaxCore is no longer under active development, users can still utilize it, though they may encounter bugs. The author successfully customized their desktop with a media player, clock, and revamped start menu, enhancing their workflow and aesthetic experience. They express a desire to further explore JaxCore and other customization tools.

Tech Optimizer

June 16, 2025

Norton Antivirus Review 2025: Solid Value for Fast, Effective Protection

Norton Antivirus has a score of 8.6 out of 10 and was established in 1982. The Norton 360 Deluxe package includes features such as real-time protection, manual and automated scans, the Genie Scam Detector, a password manager, and 2GB of cloud backups. It offers four plans: Norton Antivirus Plus, Norton 360 Standard, Norton 360 Deluxe, and Norton 360 with LifeLock Select Plus, each with varying identity protection features and cloud backup space. The installation process is user-friendly, and the software operates efficiently, using minimal CPU and disk space. Norton has maintained a perfect security ranking from AV-Test for over a decade but has experienced a data breach in the past five years. Customer support includes a knowledge base, community forum, and 24/7 live chat and phone support, with an overall customer support score of 8 out of 10. Norton’s pricing is competitive, particularly for higher-tier plans, resulting in a value ranking of 8 out of 10.

Tech Optimizer

June 9, 2025

Streamline Amazon Aurora database operations at scale: Introducing the AWS Database Acceleration Toolkit

The AWS Database Acceleration Toolkit (DAT) is an open-source solution that enhances database performance, particularly for Amazon Aurora, by utilizing Terraform for setup, provisioning, and maintenance. DAT helps organizations reduce time to market, improve customer satisfaction, and optimize costs. It is beneficial for DevOps teams, SaaS providers, and enterprises transitioning from commercial databases to Aurora. One example of its effectiveness includes a customer reducing database migration time from 12 months to 4 weeks for over 100 databases, achieving zero outages over six months, increasing database team productivity by 60-70%, and lowering infrastructure costs by 42%. DAT's architecture includes automated resource provisioning and security through Terraform, with source code available in a Git repository. It offers multiple provisioning options for Aurora clusters, including the Terraform CLI and Jenkins pipelines. Key modules include: - Aurora cluster module for creating new clusters with customization options. - Amazon RDS Proxy for enhancing application performance and security. - Aurora GlobalDB for creating clusters across AWS Regions for disaster recovery. - Aurora Monitoring for configuring CloudWatch dashboards to monitor database performance. Use case examples are provided in the Git repository for both Aurora PostgreSQL-Compatible and Aurora MySQL-Compatible engines. Deployment options include using Terraform directly, setting up a new Jenkins instance, or integrating with an existing Jenkins setup. To provision an Aurora PostgreSQL cluster, users must clone the DAT repository, navigate to the appropriate folder, configure the Terraform variable definition file, initialize the working directory, execute a plan, and apply the changes. Security features include customer-managed keys, integration with AWS Secrets Manager for password management, and enhanced monitoring through CloudWatch. To clean up, users can destroy the Aurora cluster with a Terraform command.