Microsoft is working to resolve a known issue that causes delays or blocks some users from opening the Microsoft Teams desktop client on Windows systems. [...]
Russia's data centers are concentrated in areas increasingly exposed to Ukrainian drone attacks. The Kremlin wants them to stiffen their physical defenses.
An anonymous security researcher who uses the "Nightmare Eclipse" handle released a CrowdStrike Falcon zero-day exploit named "FalconFlank" that lets attackers escalate privileges on up-to-date Windows systems. [...]
Microsoft is working to resolve an ongoing Exchange Online outage that is delaying email sent to and received from external domains. [...]
Invisible Unicode characters popularized for hiding instructions from AI models are now being used to obfuscate words before email filters parse them. The post ASCII smuggling crosses over from AI prompt injection to phishing evasion appeared first on Microsoft Security Blog.
Cybersecurity researchers have disclosed details of a sophisticated Python-based Windows malware framework called BraZetsu that fuels an underground marketplace commercializing access to compromised hosts. "Unlike the standard infostealer model, BraZetsu is a comprehensive master toolkit that empowers Initial Access Brokers (IABs) by turning compromised systems into highly valuable commercial
Microsoft says a known issue that reverts mouse settings after installing the KB5120998 August 2026 preview update affects only non-English Windows 11 systems. [...]
Infostealers can expose far more than passwords, including authenticated sessions that may let attackers bypass MFA. Flare explains how defenders can prioritize compromised identities, determine whether stolen access is still usable, and respond before it leads to account takeover. [...]
412,000 The Town 2025 festival buyer records are being sold for $10,000, with Brazil’s data openly marketed for bank fraud, loans and SIM registration. A seller on a Russian-language data-trading forum listed what they’re calling a Ticketmaster database on September 2, claiming over 412,000 Latin American purchase records with a heavy concentration of Brazilian data. […]
Microsoft has confirmed that desktop settings are lost or reset on some Windows devices after installing the KB5120998 August 2026 preview update. [...]
Explore how attackers targeting Latin American entities use AI for data exfiltration and how basic OpSec errors allow defenders to disrupt operations. The post Attackers Expose Ongoing AI Tool Use Targeting Organizations in Latin America appeared first on Unit 42.
Microsoft is working to fix a known issue that causes crashes and launch failures for Microsoft Teams and New Outlook users after installing updates released since the August 2026 Patch Tuesday. [...]
Microsoft Threat Intelligence observed a human-operated intrusion campaign that abuses Microsoft Teams external collaboration to impersonate IT support, gain remote access, and deploy a Node.js-based implant. Learn how attackers move from social engineering to lateral movement using legitimate tools, and how Microsoft Defender helps detect and disrupt the activity. The post Impersonating IT support: how threat actors turn a remote session into enterprise-wide access appeared first on Microsoft …
Google on Wednesday announced Gemini 3.8 Flash Cyber, which it described as its most capable cybersecurity model, and has made it available to a set of trusted defenders via a new initiative called the Fairwind Program. "The Fairwind Program gives high-priority defenders (like governments, healthcare providers, and telecommunications services) early access to advanced models that help them
The "Spring Ring" operation aims to compromise users of the collaboration suite to remotely access their sessions, spread malware, and even take over infrastructure.
An active malware campaign is using bogus software-download websites to impersonate trusted vendors and distribute malicious installers. "The campaign has targeted users looking to download popular software and has resulted in compromises across multiple organizations and industries, primarily affecting China-based operations of multinational organizations and Chinese-speaking users," Microsoft
An inside look at Knight Office, a newly discovered AiTM phishing kit featuring custom control panels, Cloudflare Turnstile, and M365 Token theft.
Microsoft is investigating an issue causing the Defender for Office 365 security software to mistakenly block access to legitimate Google search links. [...]
An active campaign is impersonating legitimate software vendors to deliver malware through look-alike download pages and regenerated installer archives. Microsoft Defender Experts shares observed attack techniques, Defender XDR detections, indicators of compromise, and practical mitigations to help organizations identify, block, and respond to this threat. The post Counterfeit installers to system compromise: Tracking a deceptive software download campaign appeared first on Microsoft Security B…
Cyber resilience starts before a crisis. Gain practical insights from DART to strengthen readiness and response. The post Cybersecurity IR Workshop: The workshop you shouldn’t miss appeared first on Microsoft Security Blog.
Introduction Beginning in 2024 Mandiant investigated a string of compromises affecting Brazilian financial services, retail, and eCommerce organizations. Google Threat Intelligence Group (GTIG) tracks this activity as BREEZE COMET (formerly UNC5669), a financially motivated threat actor specializing in manipulating payment systems and banking software in Brazil to conduct fraudulent transfers. This activity overlaps with operations publicly reported as Plump Spider and SHADOW-AETHER-064. In thi…
Nearly 22,000 Microsoft Exchange servers exposed online remain unpatched against a high-severity authentication bypass vulnerability that allows attackers to hijack all user mailboxes. [...]
The most common way into a company last year was to ask. A web page tells the visitor to prove they are not a robot. While they read the instructions, it quietly places a command on their clipboard. Then it talks them through opening a terminal and pasting it in. The technique is called ClickFix, and it was the most common initial access method Microsoft’s team observed last year, accounting
While guardrails are critical, as evidenced by recent high-profile incidents, defenders need help staying ahead of attackers who do not play by the rules.
A new ClickFix variant dubbed TerminalFix uses fake Cloudflare CAPTCHA prompts on compromised websites to trick victims into running malicious PowerShell commands in Windows Terminal. [...]
AWS IAM Identity Center integrates with external identity provider (IdP) to provide customers with a centralized authentication and authorization solution for AWS resources across AWS Organizations. AWS continues to invest into IAM Identity Center with a growing number of AWS services that natively integrate with IAM Identity Center. As your AWS organization scales, maintaining visibility […]
Microsoft is investigating a widespread service issue causing authentication issues, email delays and failures, and various other issues for Exchange Online customers. [...]
Microsoft has confirmed that mouse settings are being reverted on Windows 11 systems after installing the KB5120998 August 2026 non-security preview update. [...]
Learn how the Spring Ring campaign abuses Microsoft Teams and voice phishing to deploy malware and target enterprise domain controllers. The post Spring Ring: An Inside Look at Voice Phishing Campaigns in Microsoft Teams appeared first on Unit 42.
