privilege escalation Archives

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 19, 2026

New Android malware uses AI to take over your phone

A new Android malware called RatHat has emerged, analyzed by researchers from Zimperium's zLabs. It spreads through deceptive smishing texts and malicious ads that lead users to counterfeit download pages for popular apps. Once installed, it manipulates Android's Accessibility Service to gain elevated access by enabling Wireless Debugging and retrieving authentication codes without user intervention. RatHat targets finance and banking apps to steal user IDs, passwords, and MFA codes, using techniques to obtain touch coordinates for PIN recovery. It can intercept SMS messages, gain limited control of the device, and reinstall itself. Users are advised against sideloading apps and granting unnecessary accessibility permissions. Google's Advanced Protection Mode and Malwarebytes for Android can help mitigate risks associated with RatHat.

Winsage

September 16, 2026

Windows 11 out-of-band update fixes audio glitch and other bugs – grab it now

Microsoft released an out-of-band patch on Monday to resolve an audio issue affecting Windows 11 users on versions 26H2, 25H2, and 24H2. The patch addresses a glitch that caused no audio output, unresponsive sound settings, and error messages in Device Manager related to USB-connected devices using the USB Audio Class 1.0 standard. This issue originated from a September 8 security update. The patch also fixes several security vulnerabilities, including CVE-2026-62721 and CVE-2026-85921, and resolves bugs in Microsoft’s Remote Desktop Services and Hyper-V platform. Users can install the update through Windows Update, with specific update labels for each version.

Tech Optimizer

September 15, 2026

AI Is Changing Antivirus From File Matching to Behaviour-Based Malware Detection

Artificial intelligence is transforming malware detection by moving away from traditional file signature reliance to analyzing program actions. Antivirus software previously used signatures to identify known threats, but the rapid emergence of over 450,000 new malware samples daily complicates this method. Attackers now employ techniques like repacking and encryption to evade detection, prompting the need for machine-learning and behavioral techniques for better protection. Modern detection systems assess multiple characteristics of executable files, including their behavior, to identify potential threats, even if they lack recognized signatures. Microsoft's Project Ire exemplifies advanced detection capabilities, functioning as an automated malware analyst that evaluates unknown binaries based on their behavior. Additionally, modern endpoint-security products leverage cloud systems to analyze data from multiple devices, enhancing threat detection through shared intelligence. However, AI detection can still produce false positives and is susceptible to manipulation by attackers. Therefore, effective security systems require a combination of traditional measures, behavioral monitoring, machine learning, and human analysis to navigate complex threats.

Winsage

September 15, 2026

China-Linked Hackers Exploit Chrome-Windows Zero-Day Chain to Deploy GRIMWEDGE

A spear-phishing campaign linked to the Chinese threat actor UTA0560 targeted various NGOs on September 1, 2026, exploiting recently patched vulnerabilities in Google Chrome and Microsoft Windows. The campaign utilized a malicious JavaScript backdoor called GRIMWEDGE, which was deployed through a multi-stage exploit chain that involved three vulnerabilities: CVE-2026-85046, CVE-2026-87491, and CVE-2026-85880. The attack began with spear-phishing emails that led recipients to a vulnerable U.S.-based university website, allowing attackers to redirect users to their infrastructure. The exploit chain enabled arbitrary code execution and facilitated the deployment of GRIMWEDGE, which is capable of host reconnaissance, file and process management, command execution, and payload delivery. The initial payload was an executable named "msgbox.exe," which extracted a legitimate Windows binary and a malicious DLL called "wsc.dll." This DLL initiated a sideloading chain and contacted a command-and-control server for further instructions. GRIMWEDGE allows for several commands, including system reconnaissance, directory listing, file deletion, and command execution in a hidden window. It lacks built-in persistence or lateral movement mechanisms but provides a foothold for further exploitation. Concurrently, another Chinese threat actor, JungleBamboo (APT31), used the same exploit chain to deploy a loader named SUPERSTOMP, which installs a credential-stealing Chrome extension called LONGTALE. The simultaneous use of the exploit chain by multiple actors suggests potential sharing or sale of the exploit, raising concerns about patch-gap vulnerabilities that pose risks for exploitation campaigns.

AppWizard

September 15, 2026

Active Exploitation Alert: Threat Actors Abuse Anthropic Claude AI to Extract Secrets from 1.8M Android Apps in Major Credential Theft Campaign

Between December 2025 and August 2026, a coalition of advanced threat actors exploited the Claude AI model by extracting sensitive information from approximately 1.8 million Android applications. The operation involved groups such as ShinyHunters, Midnight Blizzard (APT29/Nobelium), and the Chinese-speaking entity GTG-10007. They automated the mass download, decompilation, and analysis of Android APKs for hardcoded credentials, API keys, and authentication tokens, leading to extensive credential theft and breaches across various sectors. The attack utilized a distributed pipeline on ten AWS EC2 instances to download APKs, which were then scanned using TruffleHog. Verified secrets were organized and routed in real-time to a private Telegram group for operational deployment. Over 2,100 Azure AD authentication tokens were extracted from more than 40 Microsoft tenants within 34 hours. The operation also included a carding component where stolen payment card data was sold. The tactics employed aligned with several MITRE ATT&CK techniques, including file discovery, unsecured credentials, valid accounts, phishing, and exploitation of remote services. ShinyHunters gained administrative control over targeted environments rapidly, leading to bulk data theft affecting over 200 organizations. Midnight Blizzard automated malware creation and phishing campaigns, targeting government and defense entities. GTG-10007 used Claude for coordinated offensive operations, discovering zero-day vulnerabilities and delivering exploits. Initially, the campaign targeted a broad range of Android APKs but later focused on organizations with valuable credentials across various sectors, including government, technology, and healthcare. Compromises were confirmed in Southeast Asia, Europe, and the Middle East. Organizations are advised to audit Android applications for hardcoded secrets, monitor API key usage, and implement robust security practices to mitigate risks.

Winsage

September 10, 2026

U.S. CISA adds Microsoft Windows, N-able N-central, and Adobe flaws to its Known Exploited Vulnerabilities catalog

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has expanded its Known Exploited Vulnerabilities (KEV) catalog, adding critical vulnerabilities that need immediate attention. 1. CVE-2026-75650: A vulnerability in Adobe Commerce and Magento with a CVSS score of 10.0, allowing unauthenticated remote code execution. Affected versions include Magento Open Source releases 2.4.7, 2.4.8, and 2.4.9. It has been actively exploited since September 4. 2. CVE-2026-81963: A Microsoft Windows vulnerability with a CVSS score of 7.8, related to a link-following issue within the Update Stack, allowing local attackers to escalate privileges. It is currently being exploited. 3. CVE-2026-85880: Another Microsoft Windows vulnerability rated at 7.8, involving a heap-based buffer overflow in the ALPC component, permitting local privilege escalation. This flaw is also actively exploited. 4. CVE-2026-86218: A N-able N-central vulnerability with a CVSS score of 10.0, allowing pre-authenticated remote code execution. N-able has released an emergency hotfix for this issue. Federal agencies must address these vulnerabilities by specified deadlines: Windows flaws by September 22 and other vulnerabilities by September 11, 2026, in accordance with Binding Operational Directive (BOD) 22-01. Private organizations are advised to review the KEV catalog and take necessary actions to strengthen their infrastructure against these vulnerabilities.

Winsage

September 10, 2026

Microsoft patches 966 vulnerabilities: Two Windows zero-days actively exploited

On September 8, 2026, Microsoft released 966 security updates, the largest Patch Tuesday to date, addressing various vulnerabilities. Among these, 105 were classified as critical, including two zero-day vulnerabilities: CVE-2026-81963 and CVE-2026-85880. Both allow authorized local attackers to escalate privileges to SYSTEM level. CVE-2026-81963 is related to the Windows Update Stack, while CVE-2026-85880 involves a heap-based buffer overflow in the Windows Advanced Local Procedure Call (ALPC). The updates included 438 vulnerabilities related to privilege escalation, 258 concerning remote code execution, and 173 involving information disclosures. Users are advised to prioritize the installation of these updates due to the potential exploitation of the two critical vulnerabilities.

Winsage

September 10, 2026

CVE-2026-85880 and CVE-2026-81963: Microsoft Patches Two Actively Exploited Windows Zero-Days

Microsoft's Patch Tuesday on September 8, 2026, addressed two critical Windows privilege escalation vulnerabilities: CVE-2026-85880 and CVE-2026-81963, both with a CVSS score of 7.8. CVE-2026-85880 is a heap-based buffer overflow in the Windows Advanced Local Procedure Call (ALPC), allowing attackers with low-privilege local access to escalate privileges to SYSTEM. CVE-2026-81963 involves improper link resolution in the Windows Update Stack, enabling similar privilege escalation. Both vulnerabilities require no user interaction and have been actively exploited prior to the patch release. CISA added them to its Known Exploited Vulnerabilities catalog on September 8, 2026, with a remediation deadline of September 22 for U.S. federal agencies. CVE-2026-85880 affects various Windows 10 and Server versions but excludes Windows 11 and Windows Server 2025. CVE-2026-81963 impacts newer Windows platforms, including Windows 11 and Windows Server 2025. Microsoft released security updates for both vulnerabilities on September 8, 2026, and organizations are advised to prioritize these updates. Security teams should monitor for signs of privilege escalation and unusual SYSTEM-level activities related to these vulnerabilities.

Winsage

September 9, 2026

Four Spy Groups Used the Same Chrome and Windows Exploit Kit Within a Week

Recent investigations have identified the BlueMoon exploit kit, used by espionage-driven threat activity clusters, particularly linked to APT31, a China-aligned state-sponsored group, since August 28, 2026. BlueMoon exploits three vulnerabilities: CVE-2026-85046 (a type confusion vulnerability in Google Chrome's V8 engine), an unassigned V8 sandbox escape, and CVE-2026-85880 (a heap-based buffer overflow in Windows ALPC). Google and Microsoft have released patches for these vulnerabilities, which were exploited as "patch-gap" zero-days. The attack vectors typically begin with phishing emails that lead victims to malicious URLs, triggering the vulnerabilities for code execution and privilege escalation. Variants of BlueMoon have been detected, featuring modifications for specific campaigns. Notable attack chains include: - APT31 targeting NGOs and mining firms in the U.S. with a malicious browser add-on called GemStone. - UNK_LateNight targeting U.S. aerospace companies, deploying BlueMoon alongside the ShadowPad backdoor. - UNK_DoubleCheck targeting a Vietnamese manufacturer, using DLL sideloading to execute a Rust binary. - UNK_QuietRacket targeting government and financial organizations in Indonesia and Singapore, modifying BlueMoon to execute a .NET assembly. CISA added the Chrome flaw to its Known Exploited Vulnerabilities catalog on September 4, 2026, requiring federal agencies to apply patches by September 18, 2026. Indicators of compromise include specific process trees, files, folders, scheduled tasks, mutexes, and registry keys. Proofpoint has released detection rules to help organizations identify and mitigate these threats.