T0873 Project File Infection
High-Level Description
Adversaries may attempt to infect project files with malicious code. These project files may consist of objects, program organization units, variables such as tags, documentation, and other configurations needed for PLC programs to function. Using built in functions of the engineering software, adversaries may be able to download an infected program to a PLC in the operating environment enabling further Execution and Persistence techniques.
Adversaries may export their own code into project files with conditions to execute at specific intervals. Malicious programs allow adversaries control of all aspects of the process enabled by the PLC. Once the project file is downloaded to a PLC the workstation device may be disconnected with the infected project file still executing.
Kill Chain Phase
Platforms: ICS
What to Check
How to Test
Identify Attack Surface
Determine if the target ICS/SCADA environment is susceptible to Project File Infection by examining operational technology systems and network architecture.
Assess Existing Defenses
Review whether mitigations for T0873 are in place. If defenses are absent or misconfigured, this technique may be exploitable in the ICS environment.
Remediation Guide
M0922 Restrict File and Directory Permissions
Ensure permissions restrict project file access to only engineer and technician user groups and accounts.
M0941 Encrypt Sensitive Information
When at rest, project files should be encrypted to prevent unauthorized changes.
M0947 Audit
Review the integrity of project files to verify they have not been modified by adversary behavior. Verify a cryptographic hash for the file with a known trusted version, or look for other indicators of modification (e.g., timestamps).
M0945 Code Signing
Allow for code signing of any project files stored at rest to prevent unauthorized tampering. Ensure the signing keys are not easily accessible on the same system.
Detection
Detection of Project File Infection
Risk Assessment
| Finding | Severity | Impact |
|---|
| Project File Infection technique applicable | Low | Persistence |
CWE Categories
| CWE ID | Title |
|---|
| CWE-276 | Incorrect Default Permissions |
References
