Digital Security Research | Microsoft Security Blog

Tailored AI insights from Microsoft Security Copilot

Empower your defenders to detect hidden patterns, harden defenses, and respond to incidents faster with generative AI.

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September 10 9 min read

Protecting organizations from AI-assisted executive impersonation and invoice fraud

Microsoft examines an AI-assisted business email compromise campaign that used executive impersonation and fake invoices to target finance teams with ACH payment fraud.
September 9 15 min read

Threat matrix: Mapping threats across cloud web applications

Microsoft introduces the Cloud Web Applications Threat Matrix, a MITRE ATT&CK-aligned framework that helps defenders understand, prioritize, and mitigate threats to cloud-hosted web apps and serverless platforms.
September 9 19 min read

Passkey-themed social engineering leads to identity and cloud compromise

Passkey-themed social engineering is being used to compromise identities and enable broader cloud attacks.
September 4 6 min read

How to secure edge AI in customer-owned environments

As AI moves into customer-owned environments, organizations need new ways to verify the systems, software, and AI assets they trust before releasing sensitive data, credentials, and models.
Go beyond data protection with Microsoft Purview

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September 3 17 min read

ASCII smuggling crosses over from AI prompt injection to phishing evasion

Invisible Unicode characters popularized for hiding instructions from AI models are now being used to obfuscate words before email filters parse them.
September 2 16 min read

Impersonating IT support: how threat actors turn a remote session into enterprise-wide access

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.
September 1 18 min read

Counterfeit installers to system compromise: Tracking a deceptive software download campaign

An active campaign is impersonating legitimate software vendors to deliver malware through look-alike download pages and regenerated installer archives.
September 1 4 min read

Cybersecurity IR Workshop: The workshop you shouldn’t miss

Cyber resilience starts before a crisis. Gain practical insights from DART to strengthen readiness and response.
Streamline privacy management with Microsoft Priva

Protect and govern personal information, reduce privacy risks, and manage subject rights requests at scale with Microsoft Priva privacy risk management solutions.

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August 28 16 min read

TerminalFix campaign deploys a reverse tunnel through multistage intrusion

Microsoft Threat Intelligence provides analysis of a ClickFix campaign that uses fake CAPTCHA prompts, DLL sideloading, and a reverse tunnel, with detections and hunting guidance.
August 26 23 min read

When AI infrastructure becomes the target: Securing gateways and control points

Microsoft Threat Intelligence examines attacks on exposed AI workloads, including LiteLLM gateway exploitation, credential harvesting, persistence, and cryptomining activity.
August 18 16 min read

Hunting MacSync Stealer infrastructure through behavioral pivots

MacSync Stealer rapidly rotates domains to evade detection, but its behavior remains consistent.
August 10 20 min read

DeadLock ransomware: Breaking down a Rust-based encryptor with decentralized recovery infrastructure

Microsoft Threat Intelligence examines DeadLock ransomware, an emerging financially motivated operation distinguished by its use of decentralized infrastructure to support victim communications, negotiations, and data leak operations alongside double extortion tactics used to pressure victims.