| ID | Name |
|---|---|
| T1491.001 | Internal Defacement |
| T1491.002 | External Defacement |
An adversary may deface systems internal to an organization in an attempt to intimidate or mislead users, thus discrediting the integrity of the systems. This may take the form of modifications to internal websites, or directly to user systems with the replacement of the desktop wallpaper.[1] Disturbing or offensive images may be used as a part of Internal Defacement in order to cause user discomfort, or to pressure compliance with accompanying messages. Since internally defacing systems exposes an adversary's presence, it often takes place after other intrusion goals have been accomplished.[2]
| ID | Name | Description |
|---|---|---|
| S0659 | Diavol |
After encryption, Diavol will capture the desktop background window, set the background color to black, and change the desktop wallpaper to a newly created bitmap image with the text "All your files are encrypted! For more information see "README-FOR-DECRYPT.txt".[3] |
| G0047 | Gamaredon Group |
Gamaredon Group has left taunting images and messages on the victims' desktops as proof of system access.[4] |
| G0032 | Lazarus Group |
Lazarus Group replaced the background wallpaper of systems with a threatening image after rendering the system unbootable with a Disk Structure Wipe.[2] |
| S0688 | Meteor |
Meteor can change both the desktop wallpaper and the lock screen image to a custom image.[5] |
| ID | Mitigation | Description |
|---|---|---|
| M1053 | Data Backup |
Consider implementing IT disaster recovery plans that contain procedures for taking regular data backups that can be used to restore organizational data.[6] Ensure backups are stored off system and is protected from common methods adversaries may use to gain access and destroy the backups to prevent recovery. |
| ID | Data Source | Data Component |
|---|---|---|
| DS0015 | Application Log | Application Log Content |
| DS0022 | File | File Creation |
| File Modification | ||
| DS0029 | Network Traffic | Network Traffic Content |
Monitor internal and websites for unplanned content changes. Monitor application logs for abnormal behavior that may indicate attempted or successful exploitation. Use deep packet inspection to look for artifacts of common exploit traffic, such as SQL injection. Web Application Firewalls may detect improper inputs attempting exploitation.