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T1621 · credential-access · 3 actors · 0 correlated reports

Multi-Factor Authentication Request Generation

Adversaries may attempt to bypass multi-factor authentication (MFA) mechanisms and gain access to accounts by generating MFA requests sent to users. Adversaries in possession of credentials to Valid Accounts may be unable to complete the login process if they lack access to the 2FA or MFA mechanisms required as an additional credential and security control. To circumvent this, adversaries may abuse the automatic generation of push notifications to MFA services such as Duo Push, Microsoft Authenticator, Okta, or similar services to have the user grant access to their account. If adversaries lack credentials to victim accounts, they may also abuse automatic push notification generation when this option is configured for self-service password reset (SSPR). In some cases, adversaries may continuously repeat login attempts in order to bombard users with MFA push notifications, SMS messages, and phone calls, potentially resulting in the user finally accepting the authentication request in response to “MFA fatigue.”

Open detection, hunting, mitigation, and evidence workspace

Detection logic

Monitor user account logs as well as 2FA/MFA application logs for suspicious events: unusual login attempt source location, mismatch in location of login attempt and smart device receiving 2FA/MFA request prompts, and high volume of repeated login attempts, all of which may indicate user's primary credentials have been compromised minus 2FA/MFA mechanism.

Observed actors

Correlated CTI and IR reports

Cyber Knowledge context

Use these routes to move from the ATT&CK behavior into explanation, implementation, evidence handling, validation, and defensive operations. Relevance is generated from explicit identifiers/names and governed topic mappings; it is not attribution evidence.

MITRE mitigations

M1032 · Multi-factor Authentication

Multi-Factor Authentication (MFA) enhances security by requiring users to provide at least two forms of verification to prove their identity before granting access. These factors typically include: - *Something you know*: Passwords, PINs. - *Something you have*: Physical tokens, smartphone authenticator apps. - *Something you are*: Biometric data such as fingerprints, facial recognition, or retinal scans. Implementing MFA across all critical systems and services ensures robust protection against account takeover and unauthorized access. This mitigation can be implemented through the following measures: Identity and Access Management (IAM): - Use IAM solutions like Azure Active Directory, Okta, or AWS IAM to enforce MFA policies for all user logins, especially for privileged roles. - Enable conditional access policies to enforce MFA for risky sign-ins (e.g., unfamiliar devices, geolocati…

MITRE mitigation source
M1036 · Account Use Policies

Account Use Policies help mitigate unauthorized access by configuring and enforcing rules that govern how and when accounts can be used. These policies include enforcing account lockout mechanisms, restricting login times, and setting inactivity timeouts. Proper configuration of these policies reduces the risk of brute-force attacks, credential theft, and unauthorized access by limiting the opportunities for malicious actors to exploit accounts. This mitigation can be implemented through the following measures: Account Lockout Policies: - Implementation: Configure account lockout settings so that after a defined number of failed login attempts (e.g., 3-5 attempts), the account is locked for a specific time period (e.g., 15 minutes) or requires an administrator to unlock it. - Use Case: This prevents brute-force attacks by limiting how many incorrect password attempts can be made before…

MITRE mitigation source
M1017 · User Training

User Training involves educating employees and contractors on recognizing, reporting, and preventing cyber threats that rely on human interaction, such as phishing, social engineering, and other manipulative techniques. Comprehensive training programs create a human firewall by empowering users to be an active component of the organization's cybersecurity defenses. This mitigation can be implemented through the following measures: Create Comprehensive Training Programs: - Design training modules tailored to the organization's risk profile, covering topics such as phishing, password management, and incident reporting. - Provide role-specific training for high-risk employees, such as helpdesk staff or executives. Use Simulated Exercises: - Conduct phishing simulations to measure user susceptibility and provide targeted follow-up training. - Run social engineering drills to evaluate employ…

MITRE mitigation source

MITRE detection strategies and analytics

DET0160 · Detection Strategy for Multi-Factor Authentication Request Generation (T1621)
  • AN0449 · Analytic 0449 — Monitor for excessive or anomalous MFA push notifications or token requests, especially when login attempts originate from unusual IPs or geolocations and do not correspond to legitimate user-initiated sessions.
  • AN0450 · Analytic 0450 — Detect abnormal MFA activity within cloud service provider logs, such as repeated generation of MFA challenges for the same user session or mismatched MFA device and login origin.
  • AN0451 · Analytic 0451 — Detect repeated failed login events followed by MFA challenges triggered in rapid succession, especially if originating from service accounts or anomalous IP addresses.
  • AN0452 · Analytic 0452 — Monitor PAM and syslog entries for unusual frequency of login attempts that trigger MFA prompts, particularly when MFA challenges do not match expected user behavior.
  • AN0453 · Analytic 0453 — Detect anomalous OAuth or SSO logins that repeatedly generate MFA challenges, particularly where MFA approvals are denied or timed out by the user.
  • AN0454 · Analytic 0454 — Detect user account logon attempts that trigger multiple MFA challenges through enterprise identity integrations, especially if MFA push requests are generated without successful interactive login.
MITRE detection source

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