cstromblad.com Christoffer Strömblad Wednesday, August 27, 2025 -
In this multi-source analysis I’ve attempted to fuse publicly available information about the UNC6040 group into one report and analysis to provide a better view of the activity cluster named UNC6040 (Google/Mandiant naming).

Executive Summary
UNC6040 represents a sophisticated financially motivated threat group that has emerged as a significant threat to organizations utilizing cloud-based customer relationship management systems. First identified by Google’s Threat Intelligence Group1, this actor has been conducting voice phishing campaigns since at least December 20242 to compromise Salesforce environments for large-scale data theft and extortion purposes.

The group has successfully breached approximately 20 organizations across hospitality, retail, and education sectors3, demonstrating a clear preference for targets with substantial customer databases and valuable personally identifiable information. Perhaps most notably, the group successfully compromised Google’s own Salesforce environment through sophisticated OAuth token abuse4, highlighting their capability to breach even well-defended organizations.

What distinguishes UNC6040 from traditional threat actors is their primary reliance on social engineering rather than technical exploitation. By impersonating IT support personnel through voice calls, they guide victims to authorize malicious connected apps, specifically modified versions of Salesforce’s Data Loader tool1. This approach effectively bypasses traditional security controls including multi-factor authentication, representing a fundamental shift in the threat landscape that security teams must address.

Threat Actor Profile and Victimology
UNC6040’s targeting reveals a calculated approach to victim selection. The group primarily focuses on luxury retailers, hospitality organizations, and educational institutions3, with additional confirmed targeting of aviation, financial services, and technology companies2. This sector preference suggests a clear understanding of where high-value customer data concentrates and where cloud CRM adoption is mature.

The threat actor demonstrates varying levels of technical proficiency across different intrusions, with some operations achieving complete data extraction while others result in only partial exfiltration before detection1. This inconsistency may indicate either multiple operators with different skill levels or an evolving tradecraft as the group refines their techniques.

Intelligence suggests potential collaboration with other threat actors, particularly the ShinyHunters collective4. UNC6040 may engage in partnership models where initial compromise and data theft are followed by collaboration with specialized extortion groups months after the initial breach1. This delayed monetization strategy complicates attribution and incident response efforts.

Operational Capabilities and Techniques
The group’s attack methodology begins with extensive reconnaissance through automated phone systems and live calls where operators impersonate IT support staff53. This initial intelligence gathering phase allows them to understand organizational structures, identify key personnel, and develop credible pretexts for their social engineering approaches.

The technical implementation involves guiding victims to Salesforce’s connected app setup page where they authorize malicious applications using connection codes1. These modified Data Loader applications are often disguised with legitimate-sounding names such as “My Ticket Portal” to align with the social engineering narrative13. Once authorized, these applications provide API-level access enabling bulk data exfiltration through legitimate platform features.

Post-compromise activities extend beyond the initial Salesforce environment. The group demonstrates capability for lateral movement, targeting Okta, Microsoft 365, and Workplace environments to harvest additional credentials and expand their access32. They employ test queries before conducting full data extraction1, suggesting a methodical approach to validating access and identifying high-value datasets.

The group’s data exfiltration focuses on customer PII including names, dates of birth, addresses, phone numbers, and account metadata2. By avoiding custom malware and instead relying on legitimate tools and platform features, they maintain a minimal forensic footprint that complicates detection and attribution efforts2.

Infrastructure and Operational Security
UNC6040 demonstrates strong operational security practices, primarily accessing victim environments through Mullvad VPN IP addresses1. This VPN usage provides anonymity and complicates law enforcement efforts to track the group’s activities. The threat actors also utilize Okta phishing panels hosted on the same infrastructure as their vishing operations1, suggesting a centralized approach to their technical infrastructure.

The group’s infrastructure choices reflect an understanding of modern detection capabilities and a deliberate effort to blend malicious activity with legitimate traffic patterns. By leveraging standard Salesforce API calls and OAuth workflows4, they avoid triggering traditional security alerts focused on malware or anomalous network traffic.

Strategic Outlook and Future Developments
The success of UNC6040’s operations, including the high-profile breach of Google’s Salesforce environment4, will likely inspire both evolution of their own tactics and adoption of similar techniques by other threat actors. In the near term, we assess with moderate confidence that the group will expand their targeting to additional cloud CRM platforms as organizations increase security awareness around Salesforce-specific threats.

The demonstrated collaboration between UNC6040 and groups like ShinyHunters4 suggests a maturing criminal ecosystem where specialized actors collaborate to maximize the value extracted from compromised organizations. This partnership model is likely to expand, with UNC6040 potentially serving as an initial access broker for ransomware operations or other extortion groups.

The fundamental challenge posed by UNC6040 lies not in their technical sophistication but in their exploitation of human trust and legitimate platform features. As organizations implement phishing-resistant MFA and enhanced monitoring capabilities5, the group will likely evolve their social engineering tactics and potentially shift toward supply chain targeting through managed service providers and cloud service integrators.

Looking forward, the convergence of voice-based social engineering with OAuth abuse and API-level data access represents a maturation of the threat landscape that traditional perimeter-based security models are poorly equipped to address. Organizations must anticipate continued activity from UNC6040 and similar groups, with potential escalation in both the scale of operations and the sophistication of social engineering techniques employed.

The shift from technical exploitation to identity-based attacks demonstrated by UNC6040 requires a fundamental reconsideration of security architectures. As legitimate platform features become the primary vector for data exfiltration, the distinction between authorized and malicious activity becomes increasingly nuanced, demanding behavioral analytics and continuous monitoring capabilities that many organizations currently lack.

https://cloud.google.com/blog/topics/threat-intelligence/voice-phishing-data-extortion/ ↩︎ ↩︎ ↩︎ ↩︎ ↩︎ ↩︎ ↩︎ ↩︎ ↩︎

https://unit42.paloaltonetworks.com/retail-hospitality-heists-in-the-digital-age/ ↩︎ ↩︎ ↩︎ ↩︎ ↩︎

https://www.varonis.com/blog/salesforce-vishing-threat-unc604 ↩︎ ↩︎ ↩︎ ↩︎ ↩︎

https://guardz.com/blog/from-vishing-to-oauth-abuse-how-shinyhunters-compromised-the-cloud/ ↩︎ ↩︎ ↩︎ ↩︎ ↩︎

https://cloud.google.com/blog/topics/threat-intelligence/technical-analysis-vishing-threats/ ↩︎ ↩︎