Hackers Use Vishing and SSO to Steal SaaS Data Fast

Michael Miller · 2026-05-01

Cybersecurity researchers have flagged two dangerous cybercrime groups that are pulling off what they call 'rapid, high-impact attacks.' These hackers operate almost entirely inside SaaS environments, leaving very few traces behind. It's a scary new twist on data theft that businesses need to understand. These groups, known as Cordial Spider (also called BlackFile, CL-CRI-1116, O-UNC-045, and UNC6671) and Snarky Spider (also called O-UNC-025 and UNC6661), specialize in high-speed data theft and extortion. They move fast, and they're smart about it. ### How They Get In The attack starts with vishing—voice phishing. A hacker calls an employee, pretending to be from IT or a vendor, and tricks them into sharing login credentials. Once they have access, they abuse single sign-on (SSO) systems to move through the company's SaaS apps like they belong there. - They call employees with fake emergencies. - They use stolen credentials to log into SSO portals. - They hop from one app to another without triggering alarms. This approach is effective because SSO is designed to make access easy. But that same ease becomes a weakness when attackers exploit it. ### Why SaaS Environments Are Vulnerable Most companies rely heavily on SaaS tools for email, file storage, project management, and customer data. These platforms are convenient, but they also create a big attack surface. When hackers get into one app through SSO, they can often access many others without needing additional passwords. Cordial Spider and Snarky Spider take advantage of this. They steal data in bulk—sometimes terabytes worth—and then demand a ransom. The whole thing can happen in hours, not days. ### What Makes These Attacks Different Traditional ransomware attacks often involve malware that encrypts files and leaves obvious signs. These new attacks are different. They're more like ghost burglaries: the hackers slip in, grab what they want, and vanish. Minimal traces mean companies might not even know they've been hit until the extortion note arrives. > "These groups are operating almost entirely within SaaS environments, leaving minimal traces of their actions," researchers warn. "It's a shift from noisy ransomware to quiet data theft." ### How to Protect Your Business Defending against these attacks requires a mix of good habits and smart tools. Here are a few practical steps: - Train employees to recognize vishing calls. Never share passwords over the phone. - Use multi-factor authentication (MFA) on all SSO accounts. It's not perfect, but it helps. - Monitor login activity for unusual patterns, like a user accessing many apps in a short time. - Limit access to sensitive data. Not everyone needs the keys to the castle. ### The Role of Antidetect Browsers For professionals who manage multiple online identities or work in security-sensitive roles, antidetect browsers can be a useful tool. They help mask browser fingerprints and prevent tracking, which is valuable for legitimate privacy needs. But it's important to remember that the same tech can be abused by bad actors. Understanding how these tools work can help you stay one step ahead. ### Final Thoughts Cordial Spider and Snarky Spider are just two examples of a growing trend. Cybercriminals are getting more creative, and they're targeting the tools we use every day. Staying informed and vigilant is your best defense. Keep your team trained, your systems monitored, and your data locked down.