investigation Archives

Tech Optimizer

September 23, 2026

BigDiskBuster PoC Blocks Windows Defender Updates

A new tool named BigDiskBuster has been released on GitHub, which disrupts Microsoft Defender Antivirus by preventing it from installing updates. It does this by consuming available disk space during the update process, causing Defender to remain on its current version and unable to receive new platform or signature updates. BigDiskBuster operates as a local denial-of-service technique and requires prior access to the target machine to execute. The tool was created by researcher Abdelhamid Naceri, known as Nightmare Eclipse, who has previously worked on similar projects. As of now, there is no CVE identifier, patch, or advisory from Microsoft regarding this issue.

AppWizard

September 23, 2026

Expert Opinions and Insights from the Tech Industry

The Android development community has historically addressed memory optimization reactively, but new performance requirements from Google Play, effective February 2027, emphasize proactive memory management. These requirements include metrics for dynamic memory usage, bitmap memory, and DEX code optimization, with apps needing at least 25% optimization coverage. Memory usage can now hinder releases even without local crash replication, necessitating its integration into the pre-production process alongside other performance metrics. Dynamic memory usage is defined as anonymous RSS plus swap, excluding file-backed data. Google Play will evaluate this across different application states and device performance categories. Bitmap memory is scrutinized for the retention of invisible bitmaps, and DEX optimization aims to reduce memory footprint and improve performance. Investigating memory growth involves using Android Studio’s Memory Profiler to monitor memory changes during specific user flows and conducting heap dumps to identify retained objects. Issues often arise from retained state, where components hold onto callbacks that reference image data, necessitating a focus on lifecycle management rather than merely cache size. Bitmap memory should be carefully managed, as the decoded size can significantly exceed the compressed file size. Downsampling images to match UI dimensions is crucial. Memory checks should occur before production, with a focus on establishing a memory budget based on actual measurements and defining representative memory scenarios for testing. A pre-release memory checklist includes running user flows repeatedly, testing on various devices, inspecting heap dumps, examining image configurations, and reviewing optimization metrics. Monitoring Android vitals and Play Console warnings is essential to detect potential issues before they lead to user-reported crashes.

Winsage

September 22, 2026

PAYLOAD ransomware hijacks Windows Group Policy in encryption-less attacks

A sophisticated PAYLOAD ransomware attack targeted a manufacturing organization in the Middle East, exploiting vulnerabilities in Microsoft Active Directory Group Policy. The attackers gained initial access on April 11 by compromising a domain account through the company's FortiGate SSL VPN. By April 13, they escalated privileges to a domain administrator and created a malicious Group Policy Object (GPO) named “PAYLOAD,” which was linked at the root of the domain. This GPO allowed them to distribute a ransom note, change desktop images, display a ransom message during login, and disable the local administrator account. A secondary GPO, “win Firewall Off,” was used to disable Windows Firewall across all profiles. The malicious changes activated on April 14 after system reboots, causing widespread disruption. The attackers also exfiltrated sensitive data, which was later released on the dark web. Kaspersky's investigation found no evidence of file encryption or active malware processes, indicating the attack was contained within Active Directory. Recommendations for organizations include monitoring GPO modifications, implementing multi-factor authentication for VPN access, and safeguarding privileged accounts.

Winsage

September 22, 2026

Microsoft admits Windows 11’s emergency update still breaks audio, and a fix may not arrive until October

Windows 11 is facing ongoing challenges with audio functionality following recent updates, particularly with the emergency update KB5129195 released on September 14. This update aimed to fix issues from the September Patch Tuesday update (KB5124008) but has led to new problems, including compromised audio output on some devices and disruptions in secure trust relationships for enterprise systems. Users have reported error messages like “This device cannot start (Code 10)” in Device Manager, and issues with USB audio devices. Microsoft is investigating these audio problems but has not provided a timeline for resolution. Additionally, there are reports of GPU issues on AMD systems, including driver timeouts and black screens, affecting various Radeon models such as RX 6600, RX 7700 XT, RX 7800 XT, RX 7900 GRE, RX 7900 XTX, and RX 9070 XT. Some users found that uninstalling the September update alleviated these problems, but the emergency update KB5129195 does not address the GPU errors.

Tech Optimizer

September 21, 2026

Fake LastPass Authenticator Installer Abuses Microsoft-Signed Driver to Kill Antivirus and EDR

On September 17, researchers from LastPass and Delphos Labs discovered a counterfeit LastPass Authenticator installer on GitHub that installs a malicious Windows kernel driver designed to disable antivirus and steal passwords. The driver, named Alinubx.sys, was signed through Microsoft's hardware compatibility program and initially scored zero detections on VirusTotal. The fake installer is hosted on a fraudulent GitHub page that mimics a legitimate LastPass product page. When executed, the installer uses DLL side-loading to gain SYSTEM-level access and terminates security processes, allowing it to harvest saved passwords from various browsers and applications. The driver is a renamed variant of a known malicious driver, evading detection due to its new file hash. Delphos reported the driver to Microsoft, but it was not considered a security vulnerability. Users who executed the fake installer should treat their passwords and sensitive data as compromised and change them from a secure device. The malicious server has been linked to impersonation pages for multiple brands, and the loader was likely created using a specific crypter tool.

AppWizard

September 21, 2026

When Memory Becomes a Release Metric: Preparing Android Apps for Google Play’s New Limits

In August 2026, Google Play announced new performance requirements for memory management that will be enforced starting February 2027. These requirements include metrics for dynamic memory usage, bitmap memory, and DEX code optimization. Applications that exceed these thresholds may face reduced visibility and publishing capabilities on the platform. Dynamic memory usage is defined as the sum of anonymous RSS and swap, excluding file-backed data. Google is focused on whether applications retain non-visible bitmaps and requires at least 25% coverage in DEX optimization. Memory issues can be difficult to reproduce, and developers are encouraged to use Android Studio’s Memory Profiler to investigate memory growth. A thorough investigation involves monitoring memory changes, taking heap dumps, and understanding reference paths. Bitmap memory should be carefully managed, as the runtime cost of images can exceed their file size. Google will provide real-world memory metrics through the Play Console, and teams are advised to establish memory budgets and perform pre-release checks to identify potential issues before they lead to out-of-memory (OOM) crashes.

Tech Optimizer

September 20, 2026

How to Remove a Keylogger: 12 Steps, 60 Min [2026]

A keylogger captures every keystroke made on a device and sends that information to an external source. In 2025, infostealer malware, including keyloggers, resulted in the theft of 642.4 million credentials from 13.2 million infections globally. In Australia, approximately 30,000 banking passwords were compromised between 2021 and 2025 due to this malware. The Australian Cyber Security Centre reported over 42,500 calls related to credential theft in one year, a 16% increase. Four main malware families dominate the landscape, with LummaC2 accounting for nearly 60% of credentials linked to infostealers in 2026. Keyloggers can be detected through signs such as typing lag, unexpected antivirus notifications, new browser extensions, and unexplained spikes in outbound data usage. Detection and removal steps include checking running processes, auditing startup programs, reviewing installed programs, running antivirus scans, and resetting passwords from a clean device. Keyloggers can infiltrate systems via phishing emails, malicious attachments, or compromised software downloads. Mobile devices can also be targeted by keyloggers disguised as legitimate apps.

AppWizard

September 20, 2026

Gemini’s rough patch with smart home controls has spread to Android Auto

Recent reports indicate that the Gemini smart home control feature in Android Auto has stopped functioning for many users, similar to issues previously experienced by Wear OS users. Despite Google announcing a fix for Wear OS, the cause of the Android Auto malfunction remains unclear. Users have reported that commands for smart home devices, such as turning on air conditioning, are not working, with Gemini providing a message that it "cannot control smart home devices through Google Maps while driving." Some users have reverted to Google Assistant for reliability, as commands still work within the Gemini app. The exact cause of the disruptions is under investigation, with speculation about a potential server-side bug or unannounced changes in functionality. Efforts to obtain a statement from Google are ongoing.

AppWizard

September 19, 2026

Russia’s national messenger app Max found to contain backdoor capable of secret screen captures

Researchers have found that Max, a messaging app mandated by the Russian government, can secretly capture screenshots, access sensitive information, impersonate users, and inject code into other applications. Developed by VK, the app integrates messaging, banking, and government services. Since September 1 of last year, it has been preinstalled on new smartphones, following the blocking of WhatsApp and Telegram. Despite its reach, it is not widely used in political circles, with insiders indicating that compliance with its use is performative.

Winsage

September 17, 2026

Windows Search’s default indexing mode could be writing gigabytes to your SSD every day for a feature almost nobody uses

The search index on Windows 11 can contribute to storage bloat, with reported sizes varying significantly among users. The search index database, named Windows.db, is crucial for delivering quick search results and can grow dramatically, with some users experiencing sizes exceeding 200GB. A PowerShell script can be used to check the size of the Windows.db file. If the file size is unusually large, users can rebuild the search index through the Indexing Options in the Control Panel. Windows 11 has two indexing modes: Classic and Enhanced, which affect the size and number of indexed items. Classic mode indexes specific folders, while Enhanced mode indexes the entire PC. Excluding certain directories can help manage index size. Performance issues may arise on PCs with over 400,000 indexed items.