> For the complete documentation index, see [llms.txt](https://cortex-docs.paloaltonetworks.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://cortex-docs.paloaltonetworks.com/analytics-alerts/alerts-by-name/a-user-logged-on-to-multiple-workstations-via-schannel.md).
# A user logged on to multiple workstations via Schannel
### Synopsis
| Field | Value |
| -------------------- | -------------------------------------------------------------------------------------------------------- |
| Activation Period | 14 Days |
| Training Period | 30 Days |
| Test Period | 1 Hour |
| Deduplication Period | 1 Day |
| Required Data | XDR Agent |
| Detection Modules | Identity Analytics |
| Detector Tags | Active Directory Certificate Services Analytics |
| ATT\&CK Tactic | Persistence (TA0003), Privilege Escalation (TA0004), Credential Access (TA0006) |
| ATT\&CK Technique | Account Manipulation (T1098), Valid Accounts (T1078), Steal or Forge Authentication Certificates (T1649) |
| Severity | Informational |
### Description
A user logged on to multiple workstations with a certificate via Schannel. This may be indicative of a compromised account.
### Attacker's Goals
Elevate permissions and establish persistence.
### Investigative actions
* Verify the activity with the performing user.
* Check for possible certificate authentications with the subject user.
* Check if the user logged in to other endpoints via Schannel.
### Variations
Rare user authentication with a certificate via Schannel
**Synopsis**
| Field | Value |
| ----------------- | -------------------------------------------------------------------------------------------------------- |
| ATT\&CK Tactic | Persistence (TA0003), Privilege Escalation (TA0004), Credential Access (TA0006) |
| ATT\&CK Technique | Account Manipulation (T1098), Valid Accounts (T1078), Steal or Forge Authentication Certificates (T1649) |
| Severity | Low |
**Description**
A rare user authentication with a certificate via Schannel was observed. This may be indicative of a compromised account.
**Attacker's Goals**
Elevate permissions and establish persistence.
**Investigative actions**
* Verify the activity with the performing user.
* Check for possible certificate authentications with the subject user.
* Check if the user logged in to other endpoints via Schannel.
Abnormal authentication with a certificate via Schannel
**Synopsis**
| Field | Value |
| ----------------- | -------------------------------------------------------------------------------------------------------- |
| ATT\&CK Tactic | Persistence (TA0003), Privilege Escalation (TA0004), Credential Access (TA0006) |
| ATT\&CK Technique | Account Manipulation (T1098), Valid Accounts (T1078), Steal or Forge Authentication Certificates (T1649) |
| Severity | Informational |
**Description**
An abnormal authentication with a certificate via Schannel was observed. This may be indicative of a compromised account.
**Attacker's Goals**
Elevate permissions and establish persistence.
**Investigative actions**
* Verify the activity with the performing user.
* Check for possible certificate authentications with the subject user.
* Check if the user logged in to other endpoints via Schannel.
---
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