Latest cybersecurity reporting from selected sources.

Microsoft Threat Intelligence identified threat actor activity with overlapping tradecraft commonly associated with ShinyHunters, including voice phishing (vishing), supply-chain compromise, and misconfigured guest access targeting SaaS-based applications. The post Defending SaaS-based applications against ShinyHunters OAuth abuse appeared first on Microsoft Security Blog.

Separate but similar campaigns described by Microsoft and Trend Micro use malicious zip files to spread malware via social engineering and obsfucation, including blockchain abuse.

Threat actors associated with the DragonForce ransomware have been observed using a custom Go-based remote access trojan (RAT) called Backdoor.Turn to conceal command-and-control (C2) traffic inside Microsoft Teams relay infrastructure

A dependency confusion campaign leveraged 33 malicious npm packages to collect reconnaissance data from developer and build environments. This report details the attack chain, observed tradecraft, and detection opportunities to help organizations identify and disrupt related activity. The post Malicious npm packages abuse dependency confusion to profile developer environments appeared first on Microsoft Security Blog.

A threat actor targeting Microsoft 365 and Azure production environments is stealing data in attacks that abuse legitimate applications and administration features. [...]

Microsoft's total vulnerability count stayed steady in 2025, but critical flaws surged year over year. BeyondTrust breaks down why attackers are increasingly focused on privilege escalation and identity abuse. [...]

In hard-to-detect attacks, hackers are dropping the CloudZ RAT and a fresh plug-in, Pheno, to hijack the Windows-based bridge between PCs and smartphones.

A newly discovered threat actor is using Microsoft Teams, AWS S3 buckets, and custom "Snow" malware in a multipronged campaign.

Chinese-speaking individuals are the target of a new campaign that uses a trojanized version of SumatraPDF reader to deploy the AdaptixC2 Beacon post-exploitation agent and ultimately facilitate the abuse of Microsoft Visual Studio Code (VS Code) tunnels for remote access

A "novel" social engineering campaign has been observed abusing Obsidian, a cross-platform note-taking application, as an initial access vector to distribute a previously undocumented Windows remote access trojan called PHANTOMPULSE in attacks targeting individuals in the financial and cryptocurrency sectors

Microsoft has introduced new Windows protections to defend against phishing attacks that abuse Remote Desktop connection (.rdp) files, adding warnings and disabling risky shared resources by default. [...]

Attackers are abusing Microsoft 365 mailbox rules to hide activity, exfiltrate data and retain access after account compromise, researchers warn

Cybersecurity researchers are calling attention to an active device code phishing campaign that's targeting Microsoft 365 identities across more than 340 organizations in the U.S., Canada, Australia, New Zealand, and Germany

The North Korean threat actors behind the Contagious Interview campaign, also tracked as WaterPlum, have been attributed to a malware family tracked as StoatWaffle that's distributed via malicious Microsoft Visual Studio Code (VS Code) projects

Organizations typically roll out multi-factor authentication (MFA) and assume stolen passwords are no longer enough to access systems. In Windows environments, that assumption is often wrong. Attackers still compromise networks every day using valid credentials. The issue is not MFA itself, but coverage.  Enforced through an identity provider (IdP) such as Microsoft Entra ID, Okta, or

Hackers are abusing the legitimate OAuth redirection mechanism to bypass phishing protections in email and browsers to take users to malicious pages. [...]

Microsoft on Monday warned of phishing campaigns that employ phishing emails and OAuth URL redirection mechanisms to bypass conventional phishing defenses implemented in email and browsers

Crims hope for payday from malicious payloads rather than stealing access tokens Microsoft has warned organizations about ongoing OAuth abuse scams that use phishing emails and URL redirects to infect victims' machines with malware and take over their devices.…

Threat actors are targeting technology, manufacturing, and financial organizations in campaigns that combine device code phishing and voice phishing (vishing) to abuse the OAuth 2.0 Device Authorization flow and compromise Microsoft Entra accounts. [...]

CTM360 reports 4,000+ malicious Google Groups and 3,500+ Google-hosted URLs used to spread the Lumma Stealer infostealing malware and a trojanized "Ninja Browser." The report details how attackers abuse trusted Google services to steal credentials and maintain persistence across Windows and Linux systems. [...]