Initial access is the first successful entry into the environment, often through a vulnerability, leaked credential, or compromised account. Persistence is the attacker’s ability to stay in the environment after that entry, usually by creating backdoors, abusing federation services, or planting durable access paths. Distinguishing the two helps teams choose the right containment and eradication steps.
How initial access and persistence differ in an Active Directory intrusion
Initial access is the entry point, the moment an attacker gets a foothold in the environment. Persistence is what happens after that foothold, when the attacker works to keep a reliable way back in even if the original entry path is closed. In Active Directory intrusions, those two phases often use different techniques and require different defensive actions.
That distinction matters because a team that only blocks the original entry point may still leave the attacker with alternate credentials, backdoors, or trusted relationships that survive cleanup. A useful way to think about the difference is: initial access answers “how did they get in?”, while persistence answers “how do they stay?”
What usually creates the initial foothold
Initial access in Active Directory campaigns often comes from exposed remote services, phishing that yields credentials, password reuse, stolen tokens, or abuse of a compromised account. The common theme is that the attacker crosses the boundary into the domain for the first time, not that they yet control the environment.
At this stage, defenders should focus on the access path itself, including the source of the credential, the exploited weakness, and the first authenticating identity or session. The control question is whether the entry was enabled by a technical vulnerability, a human compromise, or an already valid account that was misused.
- Cisco Yanluowang breach 2022 is a good example of how stolen access can begin with user compromise before the attacker starts adapting inside the network.
- Cisco Active Directory credentials breach illustrates how credential theft can create the first viable doorway into a domain environment.
Why persistence is a separate phase
Persistence begins after entry and focuses on durability. In Active Directory, that can mean creating new accounts, changing group membership, abusing delegation, planting scheduled tasks or services, using federation or sync trust paths, or otherwise ensuring access survives password changes and session expiry.
Persistence is different from simply “still being logged in.” It is a deliberate attempt to reduce the chance that a single remediation step removes the attacker. In mature intrusions, persistence often reflects the attacker’s expectation that initial access will eventually be detected and blocked, so they prepare alternate ways back in.
- Identity Threat Detection and Response (ITDR) Guide helps map persistence techniques to the detections that reveal them.
- Active Directory and Entra ID Hardening Guide is relevant where hybrid identity, delegation, or certificate services can become durable access paths.
How the distinction changes containment and cleanup
Initial access and persistence lead to different response priorities. For initial access, the immediate question is how the attacker got in and whether the original vector is still open. For persistence, the question is which alternate footholds, credentials, trusts, or backdoors must be removed before the environment is safe again.
That is why eradication after an Active Directory incident should not stop at password resets or firewall changes. Teams need to validate account state, privileged group membership, service accounts, federation trust, token abuse, and any long-lived access path that could let the attacker re-enter after the first foothold is closed.
Risk and Threat Considerations
Active Directory intrusions become harder to contain when defenders treat initial access and persistence as the same problem. Closing the original entry point does not remove hidden accounts, delegated trust, or other durable paths, so a compromise can survive basic remediation and reappear later.
Failure mechanism: The attacker uses one path to enter, then switches to a different access mechanism that survives the original fix, such as a new account, altered trust, or an abuse of existing privilege.
Impact: Teams may believe the incident is resolved while the adversary still has a reliable way back into the domain, increasing the chance of renewed compromise, lateral movement, and incomplete eradication.
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 sets the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST SP 800-53 Rev 5 | IA-5 — Authenticator Management | Credential lifecycle control matters because entry and persistence often hinge on stolen or durable credentials. |
| AC-2 — Account Management | Account creation and modification are common persistence paths in AD intrusion campaigns. | |
| IA-9 — Service Identification and Authentication | Service and machine authentication can be abused for durable access in hybrid AD environments. | |
| Recommendation — Rotate, revoke, and tightly govern credentials after suspected domain compromise. Review and remove unauthorized accounts, group changes, and stale privileged access. Authenticate services and workloads with strong, unique mechanisms and monitor for abuse. | ||
| MITRE ATT&CK | T1078 — Valid Accounts | Valid account abuse is a common initial access and persistence method in AD campaigns. |
| T1098 — Account Manipulation | Attackers often create or alter accounts and privileges to keep access after entry. | |
| Recommendation — Hunt for authenticated activity that does not match normal account behavior. Detect and reverse unauthorized account and privilege changes quickly. | ||
Practitioner Guidance
What to prioritise: First determine whether the observed activity is an entry event, a stay-behind mechanism, or both. That distinction should drive whether the first task is blocking exposure, rotating credentials, removing persistence, or all three.
What to verify: Confirm the earliest authenticating identity, the first internal system touched, and whether any post-compromise changes created a second access path. If you cannot explain the first foothold and the durable foothold separately, the incident scope is probably incomplete.
Practitioner takeaway: Initial access tells you where the attacker came in, but persistence tells you what would let them come back, and that second question is usually the one that determines whether cleanup actually succeeded.
Related resources from NHI Mgmt Group
- What is the difference between direct access and effective access in Active Directory?
- What is the difference between initial access and lateral movement in an AI-enabled intrusion?
- What is the difference between a privileged access workstation and Active Directory tiered administration?
- What is the difference between a manual Active Directory access review and an automated review process?
Deepen Your Knowledge
Reviewed and updated by the NHIMG editorial team on September 28, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org
