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BambooToken malware controls Windows and Linux systems via MQTT
Lumen Black Lotus Labs exposes BambooToken, a China-aligned malware framework using MQTT C2 to backdoor Windows and Linux systems at roughly a dozen enterprises.
Lumen's Black Lotus Labs documented BambooToken, a previously unknown malware framework active since at least 2023 that adopted MQTT for command-and-control in 2024-2025 variants targeting Windows and Linux. Infection occurs via DLL side-loading through digitally signed Tendyron OnKey USB-token software or an impersonated Kingsoft Office installer; dead code suggests keylogging, clipboard theft, audio/webcam capture, and screenshot modules. Telemetry identified roughly a dozen compromised entities, mostly in Asia and South America, including a Hong Kong GitLab server and possibly users of the SpeedCN VPN service. Targeting patterns are consistent with China-aligned operations, though no attribution to a known cluster was made.
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Microsoft releases emergency Windows updates to fix RDS failures
Microsoft released emergency out-of-band Windows updates fixing Remote Desktop Services failures and Hyper-V issues caused by September 2026 security patches.
Microsoft issued out-of-band updates on September 14, 2026 to fix Remote Desktop Services instability introduced by the September security updates, which caused RDP connection and sign-in failures and unresponsive servers. Updates include KB5129194 (Windows 11 26H1), KB5129195 (Windows 11 24H2/25H2), KB5129236 (Windows 10), KB5129235 (Windows Server 2025), and KB5129237 (Windows Server 2022). The Windows 11 updates also fix a Hyper-V Plan9 shared folder issue and some USB Audio Class 1.0 multichannel problems, though remaining USB audio issues await a fix. Admins had previously used Group Policy mitigations or uninstalled the security updates, which removed security protections.
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Twitch extension with 30K installs exposes users’ OAuth tokens
Twitch extension with 30,000+ installs exfiltrates users' OAuth session tokens to Russian-run JeetBot proxy servers.
Socket analysis shows the "Twitch Enhanced Viewer | JeetBot" browser extension, with over 30,000 installs on the official Chrome and Firefox stores, captures the Twitch web client's authorization header and extracts the user's OAuth token. The token is appended as an auth= URL parameter to video playlist requests routed through JeetBot proxy servers, landing in cleartext request logs retrievable by the Russian-language bot service vendor; ten hardcoded Russian-language channels are exempted. Earlier versions used more explicit token exfiltration, and the extension remained live in both stores at publication. Socket recommends removing the extension, disconnecting all Twitch sessions, and re-authenticating.
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Trezor: 347,000 users targeted in phishing attacks after Brevo breach
Trezor reported phishing after the Brevo breach targeted 347,000 newsletter subscribers, with 2,500 users clicking before the domain was taken down.
Threat actors who breached Trezor's third-party email provider Brevo on September 9, 2026 sent fake 'critical security alert' emails from [email protected] to 347,000 opted-in newsletter subscribers, claiming an STM32 microcontroller vulnerability exposed wallet seeds. The emails linked to a malicious app that asked users to enter their wallet backup; 2,500 users clicked before Trezor disabled the phishing domain within 20 minutes. Trezor also disclosed that a prior breach via logistics provider ShipMonk, exploited through a critical Metabase SQL injection zero-day, affected 81,000 customers and drew extortion emails from the ShinyHunters gang.
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New Android malware encrypts files, steals data, and harasses victims
Zimperium details Mantax Otax, an Android malware combining ransomware, spyware, and harassment, spread via phishing APKs to Indonesian users.
Zimperium researchers report Mantax Otax is distributed through malicious APKs hosted outside Google Play via phishing and social engineering, then abuses Accessibility permissions for broad device control. It encrypts files with a C2-provided AES key on Android 9 and older, adds '.enc' extensions, and hosts ransom chats on Firebase; researchers exposed attacker chats via a Firebase misconfiguration. The malware steals lock-screen PINs, SMS one-time codes, contacts, WhatsApp and Telegram chats, and captures screens via MediaProjection, while version 2 adds jumpscare overlays and text-to-speech harassment. Google Play Protect already detects and blocks it on up-to-date devices via the App Defense Alliance.
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September Windows Server updates break Remote Desktop Services
September 2026 Windows Server cumulative updates cause Remote Desktop Services failures on Server 2019, 2022 and 2025, forcing some admins to roll back.
Admins report Remote Desktop Services failures after installing September 2026 Patch Tuesday updates KB5122876 (Server 2019), KB5122882 (Server 2022), and KB5122871 (Server 2025), with connections hanging, sessions failing after logout, and some systems requiring hard resets. One administrator debugging Server 2022 observed an apparent deadlock between RDP and the Local Session Manager, though Microsoft has not confirmed a root cause. Rolling back the updates restores RDS functionality but removes this month's security fixes. Microsoft had not responded to inquiries at publication time.
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Surfshark VPN says hackers breached internal testing, proxy servers
Surfshark disclosed that hackers accessed misconfigured internal test and proxy servers, exposing build credentials but not customer data, VPN traffic, or production infrastructure.
Surfshark said a human error left an internal engineering test server reachable from the internet, exposing service configurations, build-related credentials, and portions of system binaries and code history. A separate proxy server used for content-accessibility optimization was also accessed, but it stored no user identity data, IP addresses, encryption keys, or browsing traffic. Suspicious activity was detected on August 31, contained on September 2, and remediation completed on September 5, with no evidence of credential misuse or spread to other systems. The company rotated impacted credentials, revoked exposed tokens, added monitoring and hardening, and commissioned an independent infrastructure audit; no customer action is required.
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