Malicious OAuth applications used to compromise email servers and spread spam
Microsoft researchers recently investigated an attack where malicious OAuth applications were deployed on compromised cloud tenants and then used to control Exchange servers and spread spam. The investigation revealed that the threat actor launched credential stuffing attacks against high-risk accounts ... continue reading
The art and science behind Microsoft threat hunting: Part 2
We discussed Microsoft Detection and Response Team’s (DART) threat hunting principles in part 1 of The art and science behind Microsoft threat hunting blog series. In this follow-up post, we will talk about some general hunting strategies, frameworks, tools, and ... continue reading
Check This Out! (CTO!) Guide (August 2022)
Hi everyone! Brandon Wilson here once again with this month’s “Check This Out!” (CTO!) guide. These posts are only intended to be your guide, to lead you to some content of interest, and are just a way we ... continue reading
Looking for the ‘Sliver’ lining: Hunting for emerging command-and-control frameworks
Microsoft has observed the Sliver command-and-control (C2) framework now being adopted and integrated in intrusion campaigns by nation-state threat actors, cybercrime groups directly supporting ransomware and extortion, and other threat actors to evade detection. We’ve seen these actors use Sliver ... continue reading
Disrupting SEABORGIUM’s ongoing phishing operations
The Microsoft Threat Intelligence Center (MSTIC) has observed and taken actions to disrupt campaigns launched by SEABORGIUM, an actor Microsoft has tracked since 2017. SEABORGIUM is a threat actor that originates from Russia, with objectives and victimology that align closely ... continue reading
CIS Tech Community-Check This Out! (CTO!) Guide (July 2022)
Hi everyone! Brandon Wilson here once again with this month’s “Check This Out!” (CTO!) guide. These posts are only intended to be your guide, to lead you to some content of interest, and are just a way we are trying ... continue reading
Microsoft Defender Experts for Hunting proactively hunts threats
Today, we announced the general availability of Microsoft Defender Experts for Hunting to support organizations and their cybersecurity employees with proactive threat hunting. Defender Experts for Hunting was created for customers who have a robust security operations center but want ... continue reading
From cookie theft to BEC: Attackers use AiTM phishing sites as entry point to further financial fraud
A large-scale phishing campaign that used adversary-in-the-middle (AiTM) phishing sites stole passwords, hijacked a user’s sign-in session, and skipped the authentication process even if the user had enabled multifactor authentication (MFA). The attackers then used the stolen credentials and session ... continue reading
Network ATC on Azure Stack HCI
Update: Network ATC is now publicly available with Azure Stack HCI 21H2 As you may be aware, Microsoft announced the general availability of the Azure-connected Hyper-Converged Infrastructure, Azure Stack HCI. Previously Azure Stack HCI was built off Windows Server which ... continue reading
Ransomware-as-a-service: Understanding the cybercrime gig economy and how to protect yourself
Microsoft processes 24 trillion signals every 24 hours, and we have blocked billions of attacks in the last year alone. Microsoft Security tracks more than 35 unique ransomware families and 250 unique threat actors across observed nation-state, ransomware, and criminal ... continue reading
