Threats Tagged 'oauth abuse'

Between mid-2025 and mid-2026, threat actors using tradecraft associated with ShinyHunters targeted customer SaaS applications, particularly Salesforce instances, through three primary intrusion paths. Voice phishing campaigns impersonated IT support to trick employees into authorizing malicious OAuth applications. Supply chain compromises leveraged trusted integrations including Salesloft, Gainsight, and Klue to obtain OAuth tokens for downstream customer access. Misconfigured guest access enabled exploitation of Aura framework functionality for unauthorized data queries. These techniques abused legitimate OAuth relationships to inherit user and application privileges, enabling enumeration and exfiltration of CRM data while evading authentication detections. The campaigns targeted multiple industries including retail, education, and manufacturing, highlighting risks in OAuth-connected applications and third-party integrations.

A misconfigured Python HTTP server on a Budapest VPS exposed the complete operational infrastructure of three distinct phishing operators. The investigation uncovered codemado, an Egyptian threat actor operating since 2018, running a full AiTM platform with custom tools including MaDoO Blaster; saroula01, deploying OAuth Device Code Flow attacks that accumulated 218 victims across 12 countries over a year; and mail-argenta, a Nigerian operator identified through infostealer logs containing his own credentials. All three actors leveraged customized Evilginx forks and AI-assisted development to build MFA-bypass infrastructure from public GitHub repositories. The campaigns targeted Microsoft 365 accounts primarily, with codemado maintaining ties to RockyBelling's "The Quarry" cybercrime ecosystem. The exposed server contained phishing configurations, credential logs, RMM installers, combolists, and Telegram session files, revealing sustained operations from at least January 2025 through May 2026.

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On June 11, 2026, the Icarus threat group compromised Klue's backend systems, a market intelligence platform used by hundreds of enterprises to sync competitive battlecard data with CRM environments. The attackers exploited a dormant credential from an abandoned prototype integration to harvest OAuth tokens for Salesforce and Gong. Through automated API calls using Python scripts, the group exfiltrated CRM data including business contacts, price quotes, and sales communications from multiple customer Salesforce organizations. Klue detected the anomalous activity on June 12 and revoked OAuth credentials on June 13. The attackers subsequently launched an extortion campaign starting June 16, demanding victims contact them via Session Messenger within 48 hours.

In June 2026, a compromised Klue competitive-intelligence platform integration was exploited to exfiltrate customer relationship management data from enterprise Salesforce environments. Attackers authenticated through compromised Klue service accounts, generated OAuth tokens, and executed automated Python scripts to conduct bulk data extraction via Salesforce REST API queries over approximately 24 hours. The activity included concentrated bursts of nearly a thousand queries within 15 minutes and sustained extraction windows exceeding 6 hours. This incident follows similar third-party OAuth-abuse campaigns targeting Salesforce through Salesloft Drift and Gainsight integrations throughout 2025 and 2026. While the tactics resemble operations attributed to ShinyHunters and UNC6395 threat groups, attribution remains uncertain. The initial access vector, full scope of exfiltration, and attacker intent are still under investigation, with no extortion demands observed to date.

Device code phishing attacks have exploded across the threat landscape, with new toolkits emerging weekly. This surge coincides with publicly released criminal toolkits and multiple phishing-as-a-service offerings like EvilTokens and Tycoon. Threat actors abuse the OAuth 2.0 device authorization grant flow to compromise Microsoft 365 and other enterprise accounts by tricking users into authorizing malicious applications. Current implementations use on-demand code generation, addressing the 15-minute expiration limitation of previous techniques. Most activity appears to be generated using AI-based coding techniques. Successful attacks lead to full account takeover, data theft, business email compromise, and potential ransomware deployment. The technique represents the natural evolution of credential phishing as organizations improve their defenses against traditional multifactor authentication bypass methods.

In early April 2026, a large-scale device code phishing campaign targeted organizations across multiple sectors and regions, exploiting OAuth 2.0 Device Authorization Grant. Threat actors leveraged the Kali365 phishing-as-a-service platform, originating primarily from IP address 216.203.20[.]95. The campaign used high-fidelity lures directing victims to Microsoft's legitimate device login flow, where users unknowingly authorized threat actor-controlled sessions. Captured OAuth tokens enabled immediate mailbox access and post-compromise activities. In some cases, attackers established malicious inbox rules to suppress security notifications, extending dwell time. The Kali365 platform operates as a multi-tenant PhaaS ecosystem supporting both device code abuse and adversary-in-the-middle session capture, featuring rapid lure generation across multiple languages and file types, Cloudflare Worker-hosted pages, and token sharing capabilities between affiliates.