Microsoft Teams
Microsoft rolls out screen capture prevention for Teams users
Microsoft is rolling out a new Teams feature for Premium customers that will automatically block screenshots and recordings during meetings. Microsoft announced the feature in May 2025, stating that the rollout would begin in July 2025. However, as revealed on Wednesday, this was delayed until early November. Named “Prevent screen capture,” it restricts access to visual meeting […]
Microsoft 365 outage blocks access to Teams, Exchange Online
Microsoft is working to resolve an ongoing outage preventing users from accessing Microsoft 365 services, including Microsoft Teams, Exchange Online, and the admin center. While Redmond has yet to disclose which regions are currently affected, it currently tracks it on the Service Health Dashboard as an incident, which is commonly used to describe a critical […]
Fake Microsoft Teams installers push Oyster malware via malvertising
Hackers have been spotted using SEO poisoning and search engine advertisements to promote fake Microsoft Teams installers that infect Windows devices with the Oyster backdoor, providing initial access to corporate networks. The Oyster malware, also known as Broomstick and CleanUpLoader, is a backdoor that first appeared in mid-2023 and has since been linked to multiple campaigns. […]
Microsoft adds malicious link warnings to Teams private chats
Microsoft Teams will automatically alert users when they send or receive a private message containing links that are tagged as malicious. Microsoft will introduce these new warnings for messages containing URLs that have been flagged as spam, phishing, or malware, for all Microsoft Defender for Office 365 (MDO) and Microsoft Teams enterprise customers. The new link […]
Microsoft: Anti-spam bug blocks links in Exchange Online, Teams
Microsoft is working to resolve a known issue that causes an anti-spam service to mistakenly block Exchange Online and Microsoft Teams users from opening URLs and quarantine some of their emails. In a service alert seen by GeekFeed, the company stated that the issue is caused by the anti-spam engine incorrectly tagging URLs contained within other URLs […]
Microsoft shares workaround for Teams “couldn’t connect” error
Microsoft is resolving a known issue that causes “couldn’t connect” errors when launching the Microsoft Teams desktop and web applications. The company states that the error is caused by a recent change to Teams’ sidebar, but has yet to disclose which regions are affected by this ongoing issue. While Microsoft has yet to share more […]
Microsoft Teams to protect against malicious URLs, dangerous file types
Microsoft recently revealed that it’s enhancing protection against dangerous file types and malicious URLs in Teams chats and channels. “Microsoft Teams now blocks messages containing weaponizable file types, such as executables, in chats and channels, increasing protection against malware and other file-based attacks,” the company said in a Microsoft 365 roadmap update this week. “Microsoft Teams can […]
New Ghost Calls tactic abuses Zoom and Microsoft Teams for C2 operations
A new post-exploitation command-and-control (C2) evasion method called ‘Ghost Calls’ abuses TURN servers used by conferencing apps like Zoom and Microsoft Teams to tunnel traffic through trusted infrastructure. Ghost Calls uses legitimate credentials, WebRTC, and custom tooling to bypass most existing defenses and anti-abuse measures, without relying on an exploit. This new tactic was presented […]
Attackers exploit link-wrapping services to steal Microsoft 365 logins
A threat actor has been abusing link wrapping services from reputed technology companies to mask malicious links leading to Microsoft 365 phishing pages that collect login credentials. The attacker exploited the URL security feature from cybersecurity company Proofpoint and cloud communications firm Intermedia in campaigns from June through July. Some email security services include a […]
Microsoft Teams voice calls abused to push Matanbuchus malware
The Matanbuchus malware loader has been seen being distributed through social engineering over Microsoft Teams calls impersonating IT helpdesk. Matanbuchus is a malware-as-a-service operation seen promoted on the dark web first in early 2021. It was advertised as a $2,500 Windows loader that executes malicious payloads directly in memory to evade detection. In June 2022, threat analyst Brad […]