These are standard TXT records in a domain's DNS used to prevent email spoofing.
Technical analysis reports indicate that spf.exe exhibits several high-risk behaviors:
It may store large amounts of binary data in the registry to maintain persistence. Contextual Confusion
Are you seeing this file on a or within a corporate network ?
It is important to distinguish this executable from legitimate SPF-related activities:
Automated analysis has shown it contains strings used to terminate antivirus products and attempts to install new root certificates.