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T1056.003 Web Portal Capture

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 and Valid Accounts or as part of the initial compromise by exploitation of the externally facing web service.1

Item Value
ID T1056.003
Sub-techniques T1056.001, T1056.002, T1056.003, T1056.004
Tactics TA0009, TA0006
Platforms Linux, Windows, macOS
Version 1.0
Created 11 February 2020
Last Modified 24 March 2020


ID Mitigation Description
M1026 Privileged Account Management Do not allow administrator accounts that have permissions to modify the Web content of organization login portals to be used for day-to-day operations that may expose them to potential adversaries on unprivileged systems.


ID Data Source Data Component
DS0022 File File Modification


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