Latest cybersecurity reporting from selected sources.

Cybersecurity researchers have flagged a new malware artifact generated using DeepSeek that constructed a novel attack path combining "unrealistic browser-malware concepts with a real browser capability" to turn it into a working ransomware technique that runs entirely inside the browser on both Windows and Android devices

ClickFix, the trick that fools people into running malware by hand, has quietly grown a back office

A malicious Chromium-based extension that spoofs the AI-powered answer engine Perplexity AI redirects browser search traffic using MV3 APIs and intermediary infrastructure. The post Chromium extension uses AI‑related branding to redirect browser search appeared first on Microsoft Security Blog.

27 Enterprises Integrate Claude's Compliance APIMore than two dozen enterprise security vendors, including Microsoft, CrowdStrike and Palo Alto Networks, have built integrations with Anthropic's Claude Compliance API, an interface the company launched months ago to give corporate security teams access to Claude activity data.

Cybersecurity researchers have flagged fresh activity from a China-aligned threat actor known as Webworm in 2025, deploying custom backdoors that employ Discord and Microsoft Graph API for command-and-control (C2 or C&C) communications

A security researcher has released a proof-of-concept tool named GhostLock that demonstrates how a legitimate Windows file API can be abused in attacks to block access to files stored locally or on SMB network shares. [...]

Cybersecurity researchers have discovered three packages on the Python Package Index (PyPI) repository that are designed to stealthily deliver a previously unknown malware family called ZiChatBot on Windows and Linux systems

The threat actor known as Harvester has been attributed to a new Linux version of its GoGra backdoor deployed as part of attacks likely targeting entities in South Asia

Microsoft says that an ongoing Universal Print sharing issue that prevents users from creating some printer shares is due to a Microsoft Graph API code change. [...]

A Linux variant of the GoGra backdoor uses legitimate Microsoft infrastructure, relying on an Outlook inbox for stealthy payload delivery. [...]

Researchers who found the flaws scored beer money bounties and warn the problem is probably pervasive Exclusive Security researchers hijacked three popular AI agents that integrate with GitHub Actions by using a new type of prompt injection attack to steal API keys and access tokens, and the vendors who run agents didn’t disclose the problem.…

Microsoft will turn on hotpatch security updates by default for all eligible Windows devices managed through Microsoft Intune and the Microsoft Graph API, beginning with the May 2026 Windows security update. [...]

Microsoft announced today that the Exchange Web Services (EWS) API for Exchange Online will be shut down in April 2027, after nearly 20 years. [...]

Cybersecurity researchers have disclosed details of a new fully-featured Windows backdoor called NANOREMOTE that uses the Google Drive API for command-and-control (C2) purposes

Redmond uncovers SesameOp, a backdoor hiding its tracks by using OpenAI’s Assistants API as a command channel Hackers have found a new use for OpenAI's Assistants API – not to write poems or code, but to secretly control malware.…

Microsoft has disclosed details of a novel backdoor dubbed SesameOp that uses OpenAI Assistants Application Programming Interface (API) for command-and-control (C2) communications

Microsoft security researchers have discovered a new backdoor malware that uses the OpenAI Assistants API as a covert command-and-control channel. [...]

Cybersecurity researchers have uncovered multiple security flaws in Dell's ControlVault3 firmware and its associated Windows APIs that could have been abused by attackers to bypass Windows login, extract cryptographic keys, as well as maintain access even after a fresh operating system install by deploying undetectable malicious implants into the firmware

Using the API Connections for Azure Logic Apps, a security researcher found unauthenticated users could access sensitive data of other customers.

Microsoft Sees Cyberespionage Group Lifting API Keys and Credentials for CustomersA prolific cyberespionage group tied to Beijing appears to have increased its targeting of widely used IT tools and service providers. Microsoft said the group's tactics now include stealing API keys and credentials from providers to gain access to providers' downstream customers' infrastructure.