denial-of-service Archives

Tech Optimizer

October 16, 2026

New Botnet Puts Home PCs at Risk: AV-Comparatives Publishes Malware Protection Test

AV-Comparatives evaluated 20 consumer security products against 10,000 malware samples, focusing on the x47.c botnet, which emerged in October 2026 and is marketed by WraithTools. This botnet can steal sensitive information and turn infected devices into proxies for cybercriminals. Research indicates it can extract passwords, cookies, and data from AI service accounts. The U.S. Department of Justice noted the risk to freelancers and small businesses from such threats. In its September 2026 Malware Protection Test, AV-Comparatives found that 15 out of 20 products reached the highest protection tier, with six receiving the ADVANCED+ award: Bitdefender, ESET, G DATA, Kaspersky, Total Defense, and VIPRE. The testing revealed a reliance on cloud-based detection, emphasizing the need for consistent internet connectivity for optimal protection.

AppWizard

October 15, 2026

Experts warn cheap Android phones are shipping with malware

Cybersecurity experts from Bitdefender have found that budget Android smartphones, such as the Doogee S200 X, Doogee Fire 3 Max, and Cubot KINGKONG X, may come pre-loaded with malware embedded in their firmware, posing significant security risks. This malware is introduced during the manufacturing process, particularly affecting devices with MediaTek chipsets. Thousands of users in around 150 countries, including Mexico, France, Italy, the United States, Germany, Brazil, and Spain, have been impacted. Bitdefender identified a network of 32 malicious applications disguised as legitimate utilities that generate fraudulent ad impressions. Some infected phones can function as residential proxies for criminal activities, including spam campaigns and DDoS attacks. Uninstalling the malicious app may not eliminate the infection if it is integrated into the system software, potentially requiring firmware-level remediation. Buyers of budget phones should research manufacturers' supply chain control and commitment to security updates.

Winsage

October 14, 2026

Microsoft Patches Record 1,413 Vulnerabilities, Including Exploited Windows Zero-Day

Microsoft's October 2026 Patch Tuesday updates addressed 1,413 vulnerabilities, including 1,102 in Windows, 134 in Office applications, 61 in developer tools, and 36 related to SharePoint Server. This total surpasses the vulnerabilities fixed by Microsoft in all of 2025, with over 4,000 vulnerabilities resolved in 2026. A critical zero-day vulnerability, CVE-2026-96951, with a CVSS score of 8.8, was also patched; it allows attackers to bypass Windows shell security features. The Cybersecurity and Infrastructure Security Agency (CISA) has included this vulnerability in its Known Exploited Vulnerabilities catalog. Additionally, two publicly disclosed vulnerabilities were patched, and Microsoft introduced 'risk cohorts' to help manage security updates.

Winsage

October 14, 2026

Microsoft’s Record October Patch Tuesday Fixes 1,400+ Flaws As Windows Zero-Day Comes Under Attack

Microsoft's October 2026 security updates address 1,411 vulnerabilities, marking the largest Patch Tuesday release to date. The update includes 70 vulnerabilities classified as Critical, with 57 related to remote code execution, 11 to elevation of privilege, and two to spoofing. Key vulnerabilities include CVE-2026-96951, a Windows Shell security bypass being actively exploited, CVE-2026-108398, which affects .NET Framework and allows bypassing Windows Defender Application Control, and CVE-2026-92707, a denial-of-service vulnerability in MessagePack-CSharp. The release coincides with critical Windows support deadlines, with the final regular update for Windows 11 24H2 Home and Pro and Windows 10 Enterprise LTSB 2016 occurring on October 13. Organizations are advised to prioritize the exploited vulnerabilities, ensure relevant updates are applied, and validate application-control behavior.

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.

Winsage

September 23, 2026

New Windows Defender zero-day blocks Microsoft antivirus updates

Security researcher Abdelhamid Naceri, known as Nightmare Eclipse, released a zero-day exploit called BigDiskBuster that targets Microsoft Defender, preventing antivirus updates and leaving systems vulnerable. BigDiskBuster operates across all supported Windows versions and must run in the background to block updates. Naceri has previously released a similar exploit called UnDefend and has a history of releasing multiple zero-day exploits since April 2026 amid a dispute with Microsoft. Two weeks before BigDiskBuster, he introduced another exploit named ShieldCrash, which grants SYSTEM access and circumvents a patched flaw. Naceri's recent exploits include tools like LegacyHive, BlueHammer, RedSun, YellowKey, GreenPlasma, and MiniPlasma, all targeting Microsoft Defender and other Windows components. Microsoft has warned of potential legal action against malicious activities but has not commented on BigDiskBuster.

AppWizard

September 10, 2026

Tor VPN Beta brings isolated app-by-app Tor routing to Android

The Tor Project has launched Tor VPN Beta for Android, allowing mobile applications to route traffic through the Tor network, expanding beyond web browsing. This development was driven by user demand for privacy tools to bypass internet censorship, particularly in restrictive regions. The concept originated in 2021, and after initial testing and user feedback, the beta was announced on September 9. Tor VPN creates a separate Tor circuit for each application, enhancing privacy by complicating activity correlation across apps. Users can select which applications use Tor, and the interface has been improved for easier management. The beta version 1.4.0 includes support for WebTunnel bridges to disguise Tor connections as standard encrypted traffic. Usability testing revealed issues with exit-node selection, leading to a design change that requires users to connect to Tor before choosing an exit. Tor VPN is built on the Arti implementation of the Tor protocol and the Onionmasq networking layer, ensuring stability and component sharing. The software supports reproducible builds and is available via F-Droid and APK downloads. A security review in June 2025 found no major flaws but identified some issues being addressed. Tor VPN is currently in beta and focuses on enhancing circumvention capabilities and usability rather than competing with commercial VPNs on speed. Users in censored areas are advised to configure bridges for access.

Winsage

August 16, 2026

LeakWatch CW 33/2026: Windows Zero-Day, AMD, Intel and Malware

- The August Patch Tuesday release included 421 vulnerabilities, with 236 affecting Windows, highlighting CVE-2026-68820, a critical use-after-free vulnerability that allows privilege escalation to SYSTEM level without user interaction. - CISA added CVE-2026-68820 to its Known Exploited Vulnerabilities Catalog, confirming its active exploitation. - AMD's Ryzen Master software has vulnerabilities, including CVE-2025-54512 (DLL hijacking) and CVE-2026-0465 (use-after-free), which could allow code execution with elevated privileges. - AMD's advisory on CVE-2026-6726 and CVE-2026-6727 indicates vulnerabilities in the TPM 2.0 reference code affecting Ryzen platforms, leading to potential information disclosure. - Intel's advisories included updates for microcode, Wi-Fi software, and NPU drivers, with CVE-2026-20760 addressing privilege escalation risks. - Google’s Chrome update on August 11 fixed five high-severity vulnerabilities, including use-after-free flaws. - Gunra malware has evolved into a ransomware-as-a-service model using a double-extortion strategy. - WindRelay malware combines SpyNote RAT with an NFC relay component, allowing attackers to relay NFC communication between a victim's bank card and a remote device. - The findings emphasize the need to view vulnerabilities as part of potential attack chains, highlighting the complexity of modern cybersecurity threats.

AppWizard

August 14, 2026

Threema messenger says DDoS attacks disrupted its service for two days

Threema experienced significant disruptions due to large-scale DDoS attacks, rendering the service inaccessible for several hours on Tuesday and causing intermittent outages on Wednesday morning. The attacks targeted both Threema and its Swiss colocation partner, Nine, with service being unavailable from 7:30 p.m. to 11:30 p.m. CEST on Tuesday. By 12:23 p.m. on Wednesday, normal operations were restored. The security of Threema's systems and user data remained intact despite the service availability issues. The nature of the attacks made mitigation challenging, as attackers modified their methods rapidly. Threema's status page faced issues during the outage, and communication was conducted via email and social media. In response, Threema is implementing specialized upstream DDoS protection and plans to enhance its status page to provide monitoring for future disruptions.

Winsage

July 14, 2026

Microsoft Just Patched a Record 570 Flaws in Windows

Microsoft's July Patch Tuesday update addresses 570 vulnerabilities, including three critical zero-days. The vulnerabilities include 254 elevation-of-privilege flaws, 17 security feature bypasses, 145 remote-code-execution issues, 102 information disclosures, 16 spoofing vulnerabilities, and 35 denial-of-service vulnerabilities. Among these, 59 bugs are classified as "critical." The three zero-days patched are CVE-2026-56155 (elevation of privilege in Active Directory Federation Services), CVE-2026-56164 (elevation of privilege in Microsoft SharePoint Server), and CVE-2026-50661 (security bypass in Windows BitLocker). The update is recommended to be installed as soon as possible, and users can check for updates through the Windows Update settings.