Securing AI agents: When AI tools move from reading to acting
MCP tool poisoning turns trusted AI agents into a control plane for data loss.
-
-
One intrusion, two cyberattackers: Uncovering parallel threat activity
Ransomware case reveals two parallel threat actors, blending tactics and evasion—showing why isolated signals can often miss modern, overlapping cyberattacks. -
Undermining the trust boundary: Investigating a stealthy intrusion through third-party compromise
Microsoft Incident Response investigated an attack operated through legitimate and trusted administrative mechanisms to blend seamlessly into routine operations and remain undetected demonstrating that intrusions have increasingly avoided using noisy exploits, obvious malware, or custom tooling, instead leveraging systems that organizations already trust within their environments. -
Investigating Storm-2755: “Payroll pirate” attacks targeting Canadian employees
Microsoft Incident Response – Detection and Response Team (DART) researchers observed an emerging, financially motivated threat actor, tracked as Storm-2755, compromising Canadian employee accounts to gain unauthorized access to employee profiles and divert salary payments to attacker-controlled accounts. -
Help on the line: How a Microsoft Teams support call led to compromise
A DART investigation into a Microsoft Teams voice phishing attack shows how deception and trusted tools can enable identity-led intrusions and how to stop them. -
Detecting and analyzing prompt abuse in AI tools
Hidden instructions in content can subtly bias AI, and our scenario shows how prompt injection works, highlighting the need for oversight and a structured response playbook. -
Imposter for hire: How fake people can gain very real access
Fake employees are an emerging cybersecurity threat. -
SesameOp: Novel backdoor uses OpenAI Assistants API for command and control
Microsoft Incident Response – Detection and Response Team (DART) researchers uncovered a new backdoor that is notable for its novel use of the OpenAI Assistants Application Programming Interface (API) as a mechanism for command-and-control (C2) communications. -
Retail at risk: How one alert uncovered a persistent cyberthreat
In the latest edition of our Cyberattack Series, we dive into real-world cases targeting retail organizations. -
StilachiRAT analysis: From system reconnaissance to cryptocurrency theft
Microsoft Incident Response uncovered a novel remote access trojan (RAT) named StilachiRAT, which demonstrates sophisticated techniques to evade detection, persist in the target environment, and exfiltrate sensitive data. -
Build a stronger security strategy with proactive and reactive incident response: Cyberattack Series
Find out how a cyberattack by Storm-2077 was halted faster because the Microsoft Incident Response team is both proactive and reactive at the same time. -
The art and science behind Microsoft threat hunting: Part 3
In this blog post, read how Microsoft Incident Response leverages three types of threat intelligence to enhance incident response scenarios.
