Security News > 2024 > January > Microsoft Teams phishing pushes DarkGate malware via group chats

New phishing attacks abuse Microsoft Teams group chat requests to push malicious attachments that install DarkGate malware payloads on victims' systems.
The attackers used what looks like a compromised Teams user to send over 1,000 malicious Teams group chat invites, according to AT&T Cybersecurity research.
This phishing attack is possible because Microsoft allows external Microsoft Teams users to message other tenants' users by default.
DarkGate operators capitalize on this by pushing their malware through Microsoft Teams in attacks targeting organizations where admins haven't secured their tenants by disabling the External Access setting.
Similar campaigns were observed last year pushing DarkGate malware via compromised external Office 365 accounts and Skype accounts that sent messages containing VBA loader script attachments.
Initial access brokers like Storm-0324 have also used Microsoft Teams for phishing to breach corporate networks with the help of a publicly available tool called TeamsPhisher that exploits a security issue in Microsoft Teams.
News URL
Related news
- Microsoft Warns of Tax-Themed Email Attacks Using PDFs and QR Codes to Deliver Malware (source)
- CISA and FBI Warn Fast Flux is Powering Resilient Malware, C2, and Phishing Networks (source)
- Fake Microsoft Office add-in tools push malware via SourceForge (source)
- Tycoon2FA phishing kit targets Microsoft 365 with new tricks (source)
- Midnight Blizzard deploys new GrapeLoader malware in embassy phishing (source)
- Gamma AI Platform Abused in Phishing Chain to Spoof Microsoft SharePoint Logins (source)
- Microsoft is killing Skype today, pushes users to Teams (source)
- New Microsoft 365 outage impacts Teams and other services (source)
- Microsoft Teams will soon block screen capture during meetings (source)
- Horabot Malware Targets 6 Latin American Nations Using Invoice-Themed Phishing Emails (source)