# Defending Against Identity-Based Attacks and Stolen Credentials

> Identity-based attacks use stolen credentials to bypass security. Learn why these attacks are the primary entry point and how to mitigate the risk.

- Published: 2026-04-21T12:30:18.000Z
- Severity: high
- Category: Identity & Access
- Tags: Identity Based Attacks, Credential Stuffing, Phishing, Initial Access
- Author: Runtime Rebel Intel
- Primary source: https://thehackernews.com/2026/04/no-exploit-needed-how-attackers-walk.html
- Canonical: https://runtimerebel.com/blog/defending-against-identity-based-attacks-and-stolen-credentials

## Key points

- Attackers leverage valid credentials to bypass traditional security perimeters and gain unauthorized access to sensitive corporate environments.
- Impacted systems include all enterprise platforms relying on single-factor authentication or vulnerable multi-factor authentication implementations.
- Implement robust phishing-resistant multi-factor authentication and monitor for anomalous login behavior to prevent unauthorized access.

While modern security research often focuses on complex [Zero-Day](/glossary#zero-day) exploits and [Supply Chain Attack](/glossary#supply-chain-attack) scenarios, the most prevalent threat vector remains significantly less sophisticated. According to [The Hacker News](https://thehackernews.com/2026/04/no-exploit-needed-how-attackers-walk.html), stolen credentials serve as the primary entry point for the vast majority of modern security breaches. By using valid account details, an attacker can effectively "walk through the front door," bypassing traditional perimeter defenses and [EDR](/glossary#edr) solutions that are designed to flag exploit-based anomalies.

Identity-based threats are particularly dangerous because they leverage legitimate system functionality. When an [APT](/glossary#apt) or a financially motivated cybercriminal uses valid credentials, they do not need to trigger a [CVE](/glossary#cve) or deploy complex malware during the initial phase. Instead, they authenticate as a legitimate user, which significantly complicates the detection efforts of a [SOC](/glossary#soc). This method minimizes the noise typically associated with [RCE](/glossary#rce) or other intrusive [TTP](/glossary#ttp) patterns.

### Analyzing Stolen Credentials Initial Access
The shift toward **stolen credentials initial access** represents a strategic pivot by threat actors. Rather than investing resources into discovering unpatched vulnerabilities, attackers find it more cost-effective to purchase logs from information-stealing malware or conduct large-scale [Phishing](/glossary#phishing) campaigns. Once initial access is gained, the attacker focuses on [Privilege Escalation](/glossary#privilege-escalation) and [Lateral Movement](/glossary#lateral-movement) to reach high-value targets, such as domain controllers or sensitive cloud databases. The lack of a traditional exploit makes it harder for automated systems to distinguish between an employee and an adversary.

## Common Vectors for Identity Compromise
The source material highlights several methods attackers use to harvest credentials. These include:
- **Credential Stuffing**: Utilizing automated tools to test billions of leaked username/password combinations against various services.
- **Session Hijacking**: Stealing session tokens to bypass multi-factor authentication (MFA) requirements entirely, often via infostealer malware.
- **Adversary-in-the-Middle (AiTM)**: Using proxy-based [Phishing](/glossary#phishing) kits to capture both credentials and MFA codes in real-time.

### How to Detect Credential Stuffing Attacks
Organizations must move beyond simple password policies to address these risks. To effectively **detect credential stuffing attacks**, security teams should configure their [SIEM](/glossary#siem) to monitor for high-frequency login failures originating from the same IP range or targeting multiple accounts from a single source. Furthermore, tracking "impossible travel" scenarios—where a user authenticates from two geographically distant locations within an unrealistic timeframe—is essential for identifying compromised accounts. Correlating these events with unusual [EDR](/glossary#edr) telemetry can provide the context needed to confirm a breach.

## Strategic Identity-Based Attack Mitigation
To counter these threats, organizations must adopt a [Zero Trust](/glossary#zero-trust) architecture that assumes the network is already compromised. A primary focus should be **identity-based attack mitigation** through the implementation of phishing-resistant MFA, such as FIDO2-compliant hardware keys. Standard SMS-based or push-notification MFA is increasingly susceptible to interception or "MFA fatigue" attacks.

Additionally, security teams should map observed behaviors against the [MITRE ATT&CK](/glossary#mitre-att-ck) framework, specifically focusing on Technique T1078 (Valid Accounts). By analyzing [IoC](/glossary#ioc) patterns associated with credential theft, defenders can establish a baseline of normal user activity, making it easier to spot the subtle deviations that occur when an unauthorized party uses stolen credentials to establish a [C2](/glossary#c2) channel or exfiltrate data.

**Related:** [Open Redirects: Overlooked Vulnerability Impact & Analysis](/blog/open-redirects-overlooked-vulnerability-impact-analysis), [Alabama Man Pleads Guilty to Extortion via Social Media Hijacking](/blog/alabama-man-pleads-guilty-to-extortion-via-social-media-hijacking)

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