CoPHish: New OAuth phishing technique abuses Microsoft Copilot Studio chatbots to create convincing credential theft campaigns
Source Reddit NetSec
Description
CoPHish is a novel phishing technique that leverages Microsoft Copilot Studio chatbots to craft highly convincing OAuth-based credential theft campaigns. Attackers abuse the chatbot’s capabilities to generate realistic phishing content that tricks users into granting OAuth permissions, thereby compromising their accounts. This technique does not require exploiting software vulnerabilities but relies on social engineering and the abuse of legitimate OAuth flows. The threat is categorized as medium severity due to its potential impact on user credentials and organizational security, though it requires user interaction and targeted phishing attempts. European organizations using Microsoft 365 and related cloud services are at risk, especially those with extensive OAuth integrations. Mitigation involves user education on OAuth consent phishing, strict monitoring of OAuth app permissions, and enhanced email filtering. Countries with high Microsoft cloud adoption and significant digital infrastructure, such as Germany, the UK, France, and the Netherlands, are most likely to be affected. Given the ease of exploitation through social engineering and the broad scope of affected users, the suggested severity is medium.