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.
Procedure Examples
ID |
Name |
Description |
S1022 |
IceApple |
The IceApple OWA credential logger can monitor for OWA authentication requests and log the credentials. |
Mitigations
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. |
Detection
ID |
Data Source |
Data Component |
DS0022 |
File |
File Modification |
References