Vishing

Trojanized Build Pipelines and Blind-Spot Appliances Redefine the Perimeter Attackers are bypassing traditional network defenses by compromising the tools developers use to build software and the AI assistants they rely on to write code. Campaigns like Mini Shai-Hulud and Miasma - The Spreading Blight flooded package registries with malicious code that steals cloud credentials and CI/CD tokens, while researchers proved that public AI agent skill marketplaces are completely ineffective at catching malicious add-ons. Nation-state actors and cybercriminals are simultaneously shifting their focus to blind spots in corporate networks and trusted platforms. The VerdantBamboo group exploited firewalls to bypass conditional access, while UNC3753 used IT impersonation to trick law firm employees into installing remote access tools, and Kali365 expanded its phishing infrastructure to steal multi-factor authentication tokens. Defenders must shift their focus from perimeter email filtering to securing the software build pipeline and monitoring edge appliances for anomalous traffic. Hunt for unexpected connections to cloud storage APIs and review developer environments for compromised packages or AI skills.

2026-06-057 minMandianthigh

The financially motivated threat cluster UNC3753 is conducting a fast-paced data theft and extortion campaign against US legal and professional services. The group leverages vishing and IT helpdesk impersonation to trick targets into installing legitimate RMM and screen-sharing tools, enabling rapid data exfiltration from corporate repositories and VDI environments. Notably, the campaign also involves suspected physical intrusions where actors use USB media to steal data directly from endpoints.

Developer Supply Chains Under Siege as Edge Device Exploits Surge The dominant narrative this week is the coordinated weaponization of the software supply chain, as threat actors like TeamPCP and Mini Shai-Hulud aggressively target developer tools to steal cloud credentials. Because these attackers compromise trusted build systems like GitHub Actions, a single malicious package—such as the compromised TanStack libraries—can cascade into massive downstream breaches, allowing criminals to hold development environments hostage and even deploy destructive dead-man switches if their access is cut off. In parallel, attackers are bypassing traditional network defenses by exploiting internet-facing edge devices and logging in with stolen credentials. Threat clusters are actively exploiting critical flaws in Cisco Catalyst SD-WAN and Microsoft Exchange, while ransomware groups like The Gentlemen and state-sponsored actors like Secret Blizzard use these footholds to live off the land, hijacking legitimate IT tools to stay hidden for months. These trends together suggest that perimeter-focused defenses and basic patching are no longer sufficient. Organizations must immediately isolate their CI/CD pipelines from cloud credentials, enforce phishing-resistant multi-factor authentication on all internet-facing systems, and assume that trusted vendor tools may already be compromised.

2026-05-156 minMandianthigh

UNC6671, operating under the BlackFile brand, conducts sophisticated vishing and Adversary-in-the-Middle (AiTM) attacks to bypass MFA and compromise SSO platforms like Microsoft 365 and Okta. Once inside, the group uses automated Python and PowerShell scripts to rapidly exfiltrate sensitive data via APIs, often masking their activity as routine file access events, before launching aggressive extortion campaigns.

2026-05-134 minVaroniscritical

The threat group ShinyHunters compromised Instructure's Canvas learning management system, likely via voice phishing (vishing) targeting their interconnected Salesforce environment. The breach resulted in the theft of 3.65 TB of sensitive data affecting 275 million users, which the actors are now leveraging in an active extortion campaign and which poses a severe downstream phishing risk.

2026-05-134 minCrowdStrikehigh

CORDIAL SPIDER and SNARKY SPIDER are executing rapid, SaaS-centric data theft and extortion campaigns by leveraging vishing and AiTM phishing pages. By capturing session tokens and authentication data, these actors bypass traditional endpoint defenses and pivot directly into SSO-integrated SaaS environments via the organization's Identity Provider (IdP).

2026-05-135 minZscaler ThreatLabzcritical

Payouts King is a sophisticated ransomware family operated by former BlackBasta affiliates. It gains initial access via social engineering tactics like spam bombing and Quick Assist, then deploys ransomware that utilizes direct system calls, custom API hashing, and robust RSA/AES encryption while actively evading EDR detection.

2026-05-133 minHuntressmedium

Cybercrime has evolved into a highly organized, corporate-style economy, complete with specialized departments and multi-million dollar revenues generated through tech support and subscription scams. Threat actors are increasingly leveraging generative AI for deepfakes and automated vishing, prompting defenders to adopt AI-driven countermeasures and behavioral tests to disrupt these social engineering operations.