Microsoft 365
Hotel Wi-Fi attacks use custom malware to breach Microsoft 365 accounts
Microsoft has linked a global campaign targeting hospitality Wi-Fi networks to the Russian threat actor Midnight Blizzard, also known as APT29. The activity was previously disclosed in a report from cybersecurity company ReliaQuest, which detailed how the attacker changed DNS settings on Wi-Fi devices to steal Microsoft 365 accounts. Besides attributing the campaign to Russian hackers tracked […]
Hackers hijack hotel Wi-Fi DNS to steal Microsoft 365 accounts
Hackers are changing the DNS settings on Wi-Fi devices at hotels and conference centers to redirect users to fake Microsoft 365 login pages. The campaign has been ongoing since at least June and impacts organizations in various sectors, including financial services, professional services, legal, health care, energy, and retail. Cybersecurity company ReliaQuest identified compromised Wi-Fi […]
Microsoft blames massive Microsoft 365 outage on maintenance bug
Microsoft says a bug in its automated network maintenance request system caused Thursday’s massive outage by mistakenly removing IP routes from more devices than intended, disrupting Azure and Microsoft 365 services. The outage began at 10:44 AM ET on Thursday, July 23, and mostly affected customers accessing Microsoft 365 services through network infrastructure connected to […]
Microsoft 365 outage affects Teams, SharePoint and other services
Microsoft is impacted by a massive outage affecting Teams and Microsoft 365 services, primarily affecting users in North America. At 11:11 AM ET on July 23, Downdetector recorded 2,403 reports, sharply above its normal baseline of 29. SharePoint accounted for 78% of the complaints, followed by Excel at 11% and the Microsoft 365 Admin Center at 6% […]
New HollowGraph malware uses Microsoft Graph for stealthy C2 comms
A malicious component dubbed HollowGraph uses the calendar feature in compromised Microsoft 365 mailboxes as a command-and-control channel to receive attacker commands and exfiltrate stolen data. Researchers analysing the module believe it is part of the Cavern command-and-control framework that has been previously linked to an Iranian threat actor targeting entities in Israel. At least 12 systems […]
Microsoft warns of surge in ACR Stealer attacks on customers
Microsoft has observed a surge in attacks using the ACR Stealer malware to steal browser-stored passwords, authentication tokens, and sensitive documents from its enterprise customers. Between late April and mid-June, the threat actor used the ClickFix social-engineering method, WebDAV servers, and the MSHTA (Microsoft HTML Application Host) utility to deliver the info-stealing payload. ACR Stealer […]
New Forg365 phishing platform uses AI to target Microsoft 365 accounts
A new phishing-as-a-service (PhaaS) operation called Forg365 focuses on stealing Microsoft 365 accounts by combining adversary-in-the-middle (AiTM) and device code methods with AI-assisted lure generation. The platform also provides a browser extension for continued access to the Microsoft services linked to the compromised accounts without the need to re-authenticate. Researchers at ZeroBEC email security company […]
Entra passkey enrollment vishing targets Microsoft 365 users
A threat actor has been targeting organizations across multiple sectors with voice-based fake security requests that ask Microsoft 365 users to enroll a new Entra passkey. The attacker is taking advantage of a new capability Microsoft opened to administrators in May, allowing them to run “passkey registration campaigns” to entice users to enrol passkeys for […]
ARToken PhaaS exposes EvilTokens’ Microsoft 365 phishing toolkit
A new phishing-as-a-service (PhaaS) platform dubbed “ARToken” appears to operate as an affiliate of the EvilTokens phishing platform, giving researchers a glimpse into an extensive toolkit designed to compromise Microsoft 365. Cisco Talos researchers discovered the platform while investigating phishing infrastructure used in an incident response engagement and identified a React-based management panel called “ARToken Panel” that exposed […]
New attack turned Microsoft 365 Copilot into 1-click data theft tool
A critical vulnerability chain dubbed SearchLeak in Microsoft 365 Copilot Enterprise could allow attackers to steal sensitive data from a target’s mailbox, OneDrive, or SharePoint account through a specially crafted URL. The exfiltrated information could be email content (e.g., access codes, passwords), calendar events and meeting details, documents, and other content accessible through Copilot Enterprise […]