---
{
  "title": "OS Credential Dumping",
  "summary": "OS credential dumping targets authentication material stored or processed by an operating system.",
  "topic": "foundations",
  "level": "Intermediate",
  "updated": "2026-10-12",
  "published": "2026-10-04",
  "units": [
    3
  ],
  "aliases": [
    "T1003"
  ],
  "sources": [
    {
      "title": "MITRE ATT&CK T1003: OS Credential Dumping",
      "url": "https://attack.mitre.org/techniques/T1003"
    }
  ],
  "editorialVersion": 2
}
---

## What it means

OS credential dumping targets authentication material stored or processed by an operating system. Exposure can enable later access even when the initial endpoint is isolated.

MITRE ATT&CK catalogs this behavior as **T1003**, within credential access. The technique describes a behavior; assigning the label does not by itself prove an actor identity or successful compromise.

## An investigation example

A process outside the normal security workflow accesses protected authentication memory shortly before another host receives a new login.

## Evidence to examine

Examine sensitive process access, identity privileges, subsequent authentication, and relevant endpoint evidence together.

## A common analytical pitfall

A credential-access alert does not identify every stolen account or establish that later use has occurred.

## Response considerations

Protect potentially exposed identities, preserve endpoint evidence, and investigate lateral activity before considering credential recovery complete.

## Privileged access can expose authentication material

A fictional endpoint investigation finds an unauthorized process accessing credential-related operating-system resources. Such behavior may support credential theft, but the analyst needs to establish which resources were accessed and what material was actually recovered. An alert naming credential dumping is a starting point, not the complete incident finding.

Operating systems and configurations differ. Stored hashes, cached material, process memory, and authentication databases have different access controls and implications. Review the affected platform and account privileges rather than assuming every technique produces a plaintext password. Some material may enable further authentication without revealing the original password.

Privilege boundaries influence the scope. Limiting administrative access, protecting authentication processes, and avoiding unnecessary credential presence can reduce exposure. Those measures should be tested against supported platform guidance and business requirements. A compromised highly privileged endpoint may require broader investigation than one ordinary application account.

## Build an evidence-to-account map

For a classroom scenario, create synthetic endpoint events and a list of dummy accounts active during the time window. Identify which accounts might have had material present and which are unsupported assumptions. Add subsequent authentication events and explain what corroborates misuse. Do not practice collecting real operating-system credentials on a shared or production machine.

Response may require isolating the endpoint, addressing the original access path, rotating affected credentials, and revoking related sessions or tickets as appropriate. Coordinate changes to avoid disrupting critical services without restoring security. A useful report distinguishes attempted access, confirmed collection, and observed use, enabling containment proportional to the evidence rather than an unsupported claim that every domain credential was stolen.

## Related concepts

- [[authentication]]
- [[least-privilege]]
- [[incident-response]]