How do most ransomware attacks begin today?

Four in five ransomware attacks start with stolen identities, with attackers using valid credentials to log in instead of exploiting server vulnerabilities.

Why are stolen credentials able to bypass traditional security tools?

A login with real credentials looks like normal user activity and doesn’t trigger anomaly-based alerts from firewalls, endpoint detection, or intrusion prevention systems.

What methods do attackers use to obtain working credentials?

They use phishing kits, credential-stuffing tools, and infostealer malware, or they purchase credentials leaked from previous breaches.

What does the shift to credential-based attacks mean for how organizations should defend themselves?

It changes the focus from infrastructure protection to identity protection, because patching servers and using firewalls can’t stop someone logging in with a stolen key.

Ransomware Now Logs In: 4 in 5 Attacks Start With Stolen IDs

Q: How quickly can ransomware operators cause damage once they’re inside a network?

They can move very rapidly; one example showed attackers encrypting an entire victim environment in under 24 hours after gaining initial access.

Four in five ransomware attacks today start the same way: with someone's identity, not their servers. That single statistic, reported by The Manila Times, captures a shift that has been building for years but is now impossible to ignore. Attackers are no longer racing to find an unpatched server or a zero-day exploit. They are simply logging in, using credentials that were phished, purchased, or leaked, and walking through the front door like any other authorized user.

This shift matters because it changes what "security" actually means for most organizations and individuals. A firewall cannot stop someone who has a valid username and password. A patched server does not help if the attacker never needed to exploit it. Credential-based ransomware attacks have moved the battlefield from network infrastructure to human identity, and that means the defenses that matter most have changed too.

Why Identity, Not Infrastructure, Is the New Ransomware Entry Point

For years, ransomware defense strategy centered on infrastructure: patch your servers, segment your network, monitor for intrusions. Those defenses still matter, but they address a threat model that is increasingly outdated. When four out of five attacks begin with a login rather than a break-in, the calculus changes. Attackers have realized that credentials are cheaper, faster, and far less likely to trigger alarms than a technical exploit.

Phishing kits, credential-stuffing tools, and infostealer malware have made harvesting login details a low-effort, high-reward business. Combine that with the sheer number of passwords reused across personal and work accounts, and attackers have a steady supply of working credentials without ever touching a firewall. Once inside, they don't look like intruders. They look like employees, contractors, or administrators doing their jobs, which is exactly what makes this approach so effective.

How Stolen Credentials Bypass Traditional Security Defenses

Traditional security tools are built to detect anomalies: unusual traffic patterns, unauthorized access attempts, malware signatures. A valid login using real credentials doesn't trip most of those wires. Endpoint detection systems, intrusion prevention tools, and even well-configured firewalls are designed to stop attackers who are trying to break something. They are far less effective against someone who is simply using a key that was handed to them, even if that key was stolen.

This is part of why ransomware operations have become so fast once they gain access. Reporting on the Spirals ransomware operation showed attackers encrypting an entire victim environment in under 24 hours after initial access. When entry doesn't require exploiting a vulnerability, more time and resources go straight into the damage phase. The same pattern shows up in attacks tied to CVE-2026-0257, an authentication bypass flaw in Palo Alto firewalls exploited by Qilin ransomware actors, where compromised authentication, not brute-force hacking, gave attackers the foothold they needed.

Multi-Factor Authentication and Password Managers as First Line of Defense

Given that stolen credentials are the primary entry point, the most effective defenses are the ones that make a stolen password less useful on its own. Multi-factor authentication (MFA) is the clearest example. Even if a password is compromised through phishing or a data breach, MFA requires a second verification step, such as a code from an authenticator app or a hardware key, before access is granted. It doesn't eliminate the risk entirely, but it closes off the easiest path for attackers who are relying on login credentials alone.

Password managers address a related problem: password reuse. When people use the same password across multiple accounts, a single leaked credential can unlock several unrelated systems. A password manager makes it practical to use a unique, complex password for every account, which limits the blast radius when one set of credentials is exposed. Neither tool is complicated to set up, and both directly target the exact weakness that credential-based ransomware attacks exploit.

Where VPNs Fit In Protecting Admin and Sensitive Account Access

VPNs are not a silver bullet against credential theft, but they play a specific and useful role, particularly for administrators and anyone accessing sensitive systems remotely. A VPN encrypts the connection between a user and the network they're accessing, which helps prevent credentials from being intercepted in transit, especially on unsecured or public networks. For remote administrators managing critical infrastructure, pairing VPN access with MFA adds a meaningful layer of friction for attackers who only have a stolen password to work with.

It's worth being clear about what a VPN does not do: it will not stop someone from using valid, stolen credentials to log in through a legitimate access point. That's why VPN use should be treated as one layer among several, working alongside MFA, password hygiene, and access monitoring, rather than a standalone fix.

What This Means for You

If you manage sensitive accounts, whether for a business or personal use, the takeaway is straightforward: your password is no longer enough, and it probably hasn't been for a while. Credential-based ransomware attacks succeed because they exploit predictable human habits, reused passwords, unprotected logins, and accounts without a second verification step. Closing those gaps doesn't require enterprise-level budgets or technical expertise. It requires consistent habits applied across every account that matters.

Actionable Takeaways

Enable multi-factor authentication on every account that supports it, starting with email, financial services, and any administrative access.
Use a password manager to generate and store unique passwords, eliminating the risk of reused credentials being exploited across multiple accounts.
Pair VPN use with MFA for remote administrative access, especially when managing systems over public or untrusted networks.
Treat credential hygiene as an ongoing practice, not a one-time setup, since new accounts and services are added regularly.

Ransomware groups have adapted their strategy because it works. The good news is that the countermeasures, MFA, password managers, and layered access controls, are well understood and within reach for almost anyone. The shift from breaking in to logging in means the responsibility for defense has shifted too, and it now rests as much with individual identity hygiene as it does with network security teams.