Adversaries may install code on externally facing portals, such as a VPN login page, to capture and transmit credentials of users who attempt to log into the service. For example, a compromised login page may log provided user credentials before logging the user in to the service. This variation on input capture may be conducted post-compromise using legitimate administrative access as a backup measure to maintain network access through [External Remote Services](https://attack.mitre.org/techniques/T1133) and [Valid Accounts](https://attack.mitre.org/techniques/T1078) or as part of the initial compromise by exploitation of the externally facing web service.(Citation: Volexity Virtual Private Keylogging)

Linked Issues

Issuelinks
Linktyp Issue
is related to Techniques
is blocked by Detection of Credential Harvesting via Web Portal Modification
is blocked by Privileged Account Management
is blocked by Access Restriction For Change
is blocked by Secure Baseline Configurations
is blocked by Separation of Duties (SoD)
is blocked by Identification & Authentication for Organizational Users
is blocked by Account Management
is blocked by Access Enforcement
is blocked by Least Privilege
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