Adversaries may infect Siemens PLC project files (i.e., Step 7, WinCC, etc.) to achieve [Execution](https://attack.mitre.org/tactics/TA0104), [Persistence](https://attack.mitre.org/tactics/TA0110), and [Lateral Movement](https://attack.mitre.org/tactics/TA0109) objectives. Adversaries may modify an existing project file or bring their own project files into the environment.(Citation: Nicolas Falliere, Liam O Murchu, Eric Chien February 2011) The ability for an adversary to deploy an infected project file relies on access to a workstation with Siemens PLC programming software installed on it from which a program download can be performed.
Enforce binary and application integrity with digital signature verification to prevent untrusted code from executing.
M0941Encrypt Sensitive InformationProtect sensitive data-at-rest with strong encryption.
M0947AuditPerform audits or scans of systems, permissions, insecure software, insecure configurations, etc. to identify potential weaknesses. Perform periodic integrity checks of the device to validate the correctness of the firmware, software, programs, and configurations. Integrity checks, which typically include cryptographic hashes or digital signatures, should be compared to those obtained at known valid states, especially after events like device reboots, program downloads, or program restarts.
M0922Restrict File and Directory PermissionsRestrict access by setting directory and file permissions that are not specific to users or privileged accounts.
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