Credential Theft: The Primary Attack Vector in Organizations

In 2025, more than 80% of web application attacks involved stolen credentials, according to the Verizon DBIR 2025. They were not sophisticated exploits, nor zero-days: they were legitimate usernames and passwords, used by people who should not have access.

For companies managing dozens of clients, this number is not just a statistic — it is the starting point for rethinking the priority of security controls.

##How are credentials stolen?

The credential theft system operates like an industrial value chain. Each link has specialized operators, with their own margins and business models.

1. Infostealers: the credential factory

Infostealers, malware designed specifically to extract credentials stored in browsers or email clients, are now the main engine of this chain.

There are tools operating under a Malware-as-a-Service (MaaS) model, and their process follows a very clear flow:

The user runs a malicious file (email attachment, software crack, fake ad);
The infostealer extracts session cookies, credentials saved in the browser, authentication tokens, and card data;
The data is packaged into "logs" and sent to the operator;
The logs are sold in automated dark web markets or Telegram channels.

The CrowdStrike Global Threat Report 2026 confirms the trend: 82% of detections in 2025 were malware-free, meaning attacks that used valid credentials and other techniques instead of traditional malware. This way, attackers no longer need to bypass defense mechanisms — they gain access through legitimate vectors.

2. Phishing and credential harvesting

Phishing remains the most effective distribution channel for direct credential theft. Phishing-as-a-service kits can capture not only passwords but also MFA tokens in real time, neutralizing conventional multi-factor authentication.

The IBM X-Force Threat Intelligence Index 2026 reported that thousands of AI chatbot credentials appeared for sale on the dark web, a clear sign that attackers are adapting their targets to what is currently valuable in the market.

3. Credential stuffing and password spraying

After a breach, email/password combinations are automatically tested against hundreds of services. With password reuse rates ranging from 60% to 65% (according to multiple credential hygiene studies), credential stuffing offers attackers a guaranteed ROI.

This means that a single credential compromised on a personal service can grant access to an organization's infrastructure.

##Why credentials are the primary attack vector

The success of stolen credentials as an attack vector is a direct consequence of how corporate security was designed. Most controls (antivirus, firewalls, intrusion detection systems) were built to identify anomalous behavior, malware, and suspicious traffic — not to distinguish a legitimate user from an attacker using their credentials.

It is this structural gap that makes credentials the most sought-after asset in the criminal ecosystem. Three factors make stolen credentials the preferred vector for attackers:

Immediate access, without noise

A valid credential does not trigger alerts, does not generate malware signatures, and does not leave obvious forensic artifacts. The Verizon study mentioned above shows that the average time between the use of compromised credentials and detection can stretch for weeks or months.

Scalability

A single infostealer log can contain credentials for dozens of services: corporate VPN, Microsoft 365, admin panels, bank accounts. The attacker buys a log at a low cost and potentially gains access to the user's entire digital surface.

Difficulty of detection

When access is made with legitimate credentials, distinguishing the real user from the attacker depends on behavioral signals (geolocation, schedules, device fingerprint) that many companies simply do not monitor.

CrowdStrike reports that breakout time — the interval between initial access and lateral movement — dropped to 27 seconds in the fastest cases in 2025, with an average 65% increase in breakout speed compared to the previous year.

##How to solve the problem?

If stolen credentials are the main attack vector, knowing when usernames, passwords, and session cookies appear in illicit sources becomes a basic control. For partners managing dozens of clients, the challenge is to provide this visibility without adding more operational burden to the team.

This is exactly where CyberInspect's ID Watch makes the difference. This service continuously monitors credentials associated with client domains and, when it detects a relevant exposure, it directly notifies the affected user with clear instructions on next steps. The partner does not need to set up complex processes or manage alerts manually, with the assurance that users are informed and empowered to act.

In this way, ID Watch allows the partner to offer a critical service on one of the main current attack surfaces, with minimal effort from their team and direct impact on reducing client risk.

##References

Content originally co-produced by MediaNext and CyberInspect, published on IT Security.