Event ID 4625 is logged when a logon attempt fails on the computer where the attempt was made, including on domain controllers, member servers, and workstations. It requires Audit Logon and Audit Account Lockout subcategories. Review Logon Type, Status, Sub Status, and Source Network Address to identify brute force, typos, or misconfiguration.
What Event ID 4625 tells you about the failed logon
Event ID 4625 is a failure event, not just a generic authentication error. It records that Windows rejected a logon on the host where the attempt occurred, so the first question is whether the target system is expected to receive that kind of access. The log entry is useful because it usually contains enough context to separate normal user error from repeated or scripted attempts.
That context matters most in environments where failed logons are common, such as domain controllers, jump hosts, file servers, and workstation fleets. A single 4625 may be harmless, but repeated events from the same source or against many accounts can indicate password spraying, brute force activity, stale credentials, or a service dependency that is still trying old secrets. For deeper Windows log interpretation, teams often pair 4625 with Windows Event Log Guide.
Which fields make 4625 actionable
The event becomes much more useful when you read the failure fields together rather than in isolation. Logon Type shows the access path, for example interactive, remote desktop, network, or service-style authentication. Status and Sub Status explain why the attempt failed, while Source Network Address can reveal whether the failure came from a workstation, a jump server, or a remote IP. Those details help you distinguish a mistyped password from an automation loop or a misconfigured application.
Pay attention to patterns, not just individual failures. A handful of failures for one user after a password change may be expected. Failures spread across many accounts from one source are more suspicious, especially when they arrive in a steady cadence. If the logon type indicates remote access, the source address and timing can help you decide whether the issue is user behavior, a broken integration, or hostile probing. When you are building broader Windows telemetry around those patterns, a complementary view from Sysmon Guide can help correlate process, network, and endpoint activity.
What usually sits behind repeated 4625 entries
In practice, repeated 4625 events often fall into a small set of causes. Human error is the simplest, for example a forgotten password or an old cached credential. Operational drift is next, such as a scheduled task, service, script, or application still using an expired password. The more concerning cases are hostile, where an attacker tests guessed passwords, reuses leaked credentials, or targets weakly monitored remote access paths.
That is why 4625 should be read alongside the surrounding account and host context. A failure on a workstation may simply show user error, while a failure on a server can point to a service account, batch job, or administrative pathway that deserves more scrutiny. Teams also get more value when they know whether the account involved is meant to be human-driven or used by automation. In Windows estates where script or remote administration is part of the normal operating model, a reference like PowerShell Security Guide can help interpret whether repeated failures are coming from legitimate tooling or from abuse.
Risk and Threat Considerations
Repeated 4625 events are often the earliest visible signal of either credential abuse or an access problem that is about to become an outage. The risk is not the event itself, but what it can hide: password spraying against exposed login surfaces, stale service credentials that will later break production jobs, or lockout pressure against a high-value account.
Failure mechanism: Attackers or broken services keep presenting invalid credentials until the environment either denies access, locks the account, or starts generating noise that masks the real source of failure. On the defensive side, weak visibility into logon type, source address, and account context makes it hard to tell a typo from an active guessing campaign.
Impact: You can end up with account lockouts, disrupted services, delayed detection of brute force activity, and wasted investigation time. In a larger environment, repeated failures can also create alert fatigue, which makes genuine compromise easier to miss.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
MITRE ATT&CK addresses the attack and risk surface, while NIST SP 800-53 Rev 5 and CIS Controls v8 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST SP 800-53 Rev 5 | AU-2 — Event Logging | Failed logons need audit events to be recorded and reviewable. |
| AU-6 — Audit Review, Analysis, and Reporting | 4625 is actionable only when analysts review and correlate the event fields. | |
| IA-2 — Identification and Authentication (Organizational Users) | The event is a direct outcome of failed user authentication on Windows systems. | |
| Recommendation — Log failed logons and review them for abuse patterns. Analyze failed logons for brute force, misconfiguration, and lockout risk. Validate user authentication failures against expected access paths. | ||
| MITRE ATT&CK | T1110 — Brute Force | Repeated 4625s can indicate password guessing or spraying activity. |
| Recommendation — Correlate repeated failures with brute-force and password-spraying detection. | ||
| CIS Controls v8 | CIS-5 — Account Management | Failed logons often expose account misuse, lockouts, and credential lifecycle issues. |
| Recommendation — Review account activity and disable stale or misused credentials. | ||
Practitioner Guidance
What to verify: Confirm whether the failing account is a person, a service, or a scheduled process, then compare the source host and logon type against expected behavior. If the same failure pattern appears after a password change, treat it as a credential update problem first; if the source is unfamiliar or the failures are distributed across many accounts, treat it as a security investigation.
Decision rule: If the event is isolated and matches a user mistake, resolve the access issue and move on. If the failures are repeated, cross-account, or tied to remote access, escalate to authentication abuse review, check for lockouts, and look for related success events around the same time.
Practitioner takeaway: Event ID 4625 is most valuable when you use it as a pattern signal, not a one-off error code, because the surrounding fields tell you whether you are seeing normal user friction, broken automation, or active credential attack behavior.