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Vishing

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high advisory

Spring Ring Voice Phishing Campaign Targeting Microsoft Teams

The Spring Ring campaign is a coordinated voice phishing operation impersonating IT help desk staff via Microsoft Teams to coerce victims into executing remote access tools or facilitating NTLM relay attacks against domain controllers.

Microsoft Teams +1 phishing social-engineering identity teams vishing
2t 8i
high threat

ShinyHunters OAuth Abuse Targeting SaaS Applications

ShinyHunters, and related threat actor Storm-3138, conducted campaigns between mid-2025 and mid-2026 by employing voice phishing, supply chain compromise, and misconfigured guest access to abuse trusted OAuth relationships in SaaS applications like Salesforce, leading to unauthorized access, data exfiltration, and persistence.

Salesforce +4 ShinyHunters oauth-abuse saas supply-chain vishing data-exfiltration persistence cloud
6t
high threat

UNC6671 BlackFile Vishing Extortion Campaign Targeting Microsoft 365 and Okta

UNC6671, operating under the "BlackFile" brand, conducts a sophisticated extortion campaign targeting organizations through voice phishing (vishing) and single sign-on (SSO) compromise, using adversary-in-the-middle (AiTM) techniques to bypass MFA and exfiltrate sensitive corporate data.

Microsoft 365 +5 UNC6671 vishing extortion aitm credential-theft data-exfiltration sso
2r 8t 5i