Microsoft 365 | Breaking Cybersecurity News | The Hacker News

Cybercriminals are increasingly leveraging legitimate HTTP client tools to facilitate account takeover (ATO) attacks on Microsoft 365 environments. Enterprise security company Proofpoint said it observed campaigns using HTTP clients Axios and Node Fetch to send HTTP requests and receive HTTP responses from web servers with the goal of conducting ATO attacks. "Originally sourced from public repositories like GitHub, these tools are increasingly used in attacks like Adversary-in-the-Middle (AitM) and brute force techniques, leading to numerous account takeover (ATO) incidents," security researcher Anna Akselevich said . The use of HTTP client tools for brute-force attacks has been a long-observed trend since at least February 2018, with successive iterations employing variants of OkHttp clients to target Microsoft 365 environments at least until early 2024. But by March 2024, Proofpoint said it began to observe a wide range of HTTP clients gaining traction, with the atta...

The modern workplace has undergone a seismic transformation over recent years, with hybrid work becoming the norm and businesses rapidly adopting cloud-based Software-as-a-Service (SaaS) applications to facilitate it. SaaS applications like Microsoft 365 and Google Workspace have now become the backbone of business operations, enabling seamless collaboration and productivity. However, this dependence on SaaS solutions has also attracted a surge in cyberthreats, exposing critical business data to risks like ransomware and phishing attacks.  Amid these challenges, the 2025 State of SaaS Backup and Recovery Report offers a timely analysis of the SaaS data protection landscape. By surveying over 3,700 IT professionals from diverse industries and company sizes, this report highlights trends, challenges and solutions shaping the future of SaaS data resilience. For organizations seeking clarity in navigating these turbulent waters, the findings provide invaluable guidance. Key revelat...

As cloud security evolves in 2025 and beyond, organizations must adapt to both new and evolving realities, including the increasing reliance on cloud infrastructure for AI-driven workflows and the vast quantities of data being migrated to the cloud. But there are other developments that could impact your organizations and drive the need for an even more robust security strategy. Let's take a look… #1: Increased Threat Landscape Encourages Market Consolidation Cyberattacks targeting cloud environments are becoming more sophisticated, emphasizing the need for security solutions that go beyond detection. Organizations will need proactive defense mechanisms to prevent risks from reaching production. Because of this need, the market will favor vendors offering comprehensive, end-to-end security platforms that streamline risk mitigation and enhance operational efficiency. #2: Cloud Security Unifies with SOC Priorities Security operations centers (SOC) and cloud security functions are c...

Cybersecurity researchers have detailed a new adversary-in-the-middle (AitM) phishing kit that's capable of Microsoft 365 accounts with an aim to steal credentials and two-factor authentication (2FA) codes since at least October 2024. The nascent phishing kit has been dubbed Sneaky 2FA by French cybersecurity company Sekoia, which detected it in the wild in December. Nearly 100 domains hosting Sneaky 2FA phishing pages have been identified as of this month, suggesting moderate adoption by threat actors. "This kit is being sold as phishing-as-a-service (PhaaS) by the cybercrime service 'Sneaky Log,' which operates through a fully-featured bot on Telegram," the company said in an analysis. "Customers reportedly receive access to a licensed obfuscated version of the source code and deploy it independently." Phishing campaigns have been observed sending payment receipt-related emails to entice recipients into opening bogus PDF documents containing QR co...

An interruption to the phishing-as-a-service (PhaaS) toolkit called Rockstar 2FA has led to a rapid uptick in activity from another nascent offering named FlowerStorm . "It appears that the [Rockstar2FA] group running the service experienced at least a partial collapse of its infrastructure, with pages associated with the service no longer reachable," Sophos said in a new report published last week. "This does not appear to be because of a takedown action, but due to some technical failure on the backend of the service." Rockstar2FA was first documented by Trustwave late last month as a PhaaS service that allows criminal actors to launch phishing attacks that are capable of harvesting Microsoft 365 account credentials and session cookies, thereby circumventing multi-factor authentication (MFA) protections. The service is assessed to be an updated version of the DadSec phishing kit, which is tracked by Microsoft under the name Storm-1575. A majority of the ph...

A previously undocumented "phishing empire" has been linked to cyber attacks aimed at compromising Microsoft 365 business email accounts over the past six years. "The threat actor created a hidden underground market, named W3LL Store, that served a closed community of at least 500 threat actors who could purchase a custom phishing kit called W3LL Panel, designed to bypass MFA, as well as 16 other fully customized tools for business email compromise (BEC) attacks," Group-IB  said  in a report shared with The Hacker News. The phishing infrastructure is estimated to have targeted more than 56,000 corporate Microsoft 365 accounts and compromised at least 8,000 of them, primarily in the U.S., the U.K., Australia, Germany, Canada, France, the Netherlands, Switzerland, and Italy between October 2022 and July 2023, netting its operators $500,000 in illicit profits. Some of the prominent sectors infiltrated using the phishing solution include manufacturing, IT, consultin...

New research has disclosed what's being called a security vulnerability in Microsoft 365 that could be exploited to infer message contents due to the use of a broken cryptographic algorithm. "The [Office 365 Message Encryption] messages are encrypted in insecure Electronic Codebook ( ECB ) mode of operation," Finnish cybersecurity company WithSecure  said  in a report published last week. Office 365 Message Encryption (OME) is a security mechanism used to send and receive encrypted email messages between users inside and outside an organization without revealing anything about the communications themselves. A consequence of the newly disclosed issue is that rogue third-parties gaining access to the encrypted email messages may be able to decipher the messages, effectively breaking confidentiality protections. Electronic Codebook is one of the simplest modes of encryption wherein each message block is encoded separately by a key, meaning identical plaintext blocks wi...

Microsoft on Thursday warned of a consumer-facing attack that made use of rogue OAuth applications deployed on compromised cloud tenants to ultimately seize control of Exchange servers and spread spam. "The threat actor launched credential stuffing attacks against high-risk accounts that didn't have multi-factor authentication (MFA) enabled and leveraged the unsecured administrator accounts to gain initial access," the Microsoft 365 Defender Research Team said. The unauthorized access to the cloud tenant permitted the adversary to register a malicious OAuth application and grant it elevated permissions, and eventually modify Exchange Server settings to allow inbound emails from specific IP addresses to be routed through the compromised email server. "These modifications to the Exchange server settings allowed the threat actor to perform their primary goal in the attack: sending out spam emails," Microsoft  said . "The spam emails were sent as part of a...

A "dangerous piece of functionality" has been discovered in Microsoft 365 suite that could be potentially abused by a malicious actor to mount attacks on cloud infrastructure and ransom files stored on SharePoint and OneDrive. The cloud ransomware attack makes it possible to launch file-encrypting malware to "encrypt files stored on SharePoint and OneDrive in a way that makes them unrecoverable without dedicated backups or a decryption key from the attacker," Proofpoint  said  in a report published today. The infection sequence can be carried out using a combination of Microsoft APIs, command-line interface (CLI) scripts, and PowerShell scripts, the enterprise security firm added. The attack, at its core, hinges on a Microsoft 365 feature called AutoSave that creates copies of older file versions as and when users make edits to a file stored on OneDrive or SharePoint Online. It commences with gaining unauthorized access to a target user's SharePoint Online...

Microsoft 365 (M365), formerly called Office 365 (O365), is Microsoft's cloud strategy flagship product with major changes ahead, such as the deprecation of their legacy authentication protocols. Often stored on or saved to the device, Basic Authentication protocols rely on sending usernames and passwords with every request, increasing the risk of attackers capturing users' credentials, particularly if not TLS protected. Basic Authentication, while necessary for companies using legacy software, is unable to enforce MFA and is superseded by Modern Authentication. The legacy settings have been on Microsoft's radar to fix for years. In 2018,  Microsoft announced  it would introduce a series of changes — and ultimately deprecation — to its authentication controls as a means to help organizations mitigate the risk. These changes were set to take place over a number of years, and in September 2021,  they announced  that they will begin to permanently disable Basic Auth ...