Threat intelligence

The Microsoft Threat Intelligence community is made up of world-class experts, security researchers, analysts, and threat hunters who analyze 100 trillion signals daily to discover threats and deliver timely and timely, relevant insight to protect customers. See our latest findings, insights, and guidance.

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November 3

10 min read

SesameOp: Novel backdoor uses OpenAI Assistants API for command and control

Microsoft Incident Response – Detection and Response Team (DART) researchers uncovered a new backdoor that is notable for its novel use of the OpenAI Assistants Application Programming Interface (API) as a mechanism for command-and-control (C2) communications.
October 20

20 min read

Inside the attack chain: Threat activity targeting Azure Blob Storage

Azure Blob Storage is a high-value target for threat actors due to its critical role in storing and managing massive amounts of unstructured data at scale across diverse workloads and is increasingly targeted through sophisticated attack chains that exploit misconfigurations, exposed credentials, and evolving cloud tactics.
October 9

12 min read

Investigating targeted “payroll pirate” attacks affecting US universities

Microsoft Threat Intelligence has identified a financially motivated threat actor that we track as Storm-2657 compromising employee accounts to gain unauthorized access to employee profiles and divert salary payments to attacker-controlled accounts, attacks that have been dubbed “payroll pirate”.
October 7

23 min read

Disrupting threats targeting Microsoft Teams

Threat actors seek to abuse Microsoft Teams features and capabilities across the attack chain, underscoring the importance for defenders to proactively monitor, detect, and respond effectively.
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October 6

8 min read

Investigating active exploitation of CVE-2025-10035 GoAnywhere Managed File Transfer vulnerability

Storm-1175, a financially motivated actor known for deploying Medusa ransomware and exploiting public-facing applications for initial access, was observed exploiting the deserialization vulnerability in GoAnywhere MFT’s License Servlet, tracked as CVE-2025-10035.
September 25

13 min read

XCSSET evolves again: Analyzing the latest updates to XCSSET’s inventory

Microsoft Threat Intelligence has uncovered a new variant of the XCSSET malware, which is designed to infect Xcode projects, typically used by software developers building Apple or macOS-related applications.
September 24

10 min read

AI vs. AI: Detecting an AI-obfuscated phishing campaign

Microsoft Threat Intelligence recently detected and blocked a credential phishing campaign that likely used AI-generated code to obfuscate its payload and evade traditional defenses, demonstrating a broader trend of attackers leveraging AI to increase the effectiveness of their operations and underscoring the need for defenders to understand and anticipate AI-driven threats.
August 27

23 min read

Storm-0501’s evolving techniques lead to cloud-based ransomware

Financially motivated threat actor Storm-0501 has continuously evolved their campaigns to achieve sharpened focus on cloud-based tactics, techniques, and procedures (TTPs).
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August 21

26 min read

Think before you Click(Fix): Analyzing the ClickFix social engineering technique

The ClickFix social engineering technique has been growing in popularity, with campaigns targeting thousands of enterprise and end-user devices daily.
August 18

16 min read

Dissecting PipeMagic: Inside the architecture of a modular backdoor framework

A comprehensive technical deep dive on PipeMagic, a highly modular backdoor used by Storm-2460 masquerading as a legitimate open-source ChatGPT Desktop Application.
July 31

13 min read

Frozen in transit: Secret Blizzard’s AiTM campaign against diplomats

Microsoft Threat Intelligence has uncovered a cyberespionage campaign by the Russian state actor we track as Secret Blizzard that has been ongoing since at least 2024, targeting embassies in Moscow using an adversary-in-the-middle (AiTM) position to deploy their custom ApolloShadow malware.
July 28

9 min read

Sploitlight: Analyzing a Spotlight-based macOS TCC vulnerability

Microsoft Threat Intelligence has discovered a macOS vulnerability, tracked as CVE-2025-31199, that could allow attackers to steal private data of files normally protected by Transparency, Consent, and Control (TCC), including the ability to extract and leak sensitive information cached by Apple Intelligence.

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