mssigstub.exe - random directories

Ever notice a random looking directory on your drives? And some files like mssigstub.exe or sigstub.exe inside, signed "Microsoft Code Signing PCA", described as "Microsoft Malware Protection Signature Update Stub"?

Well, I have, and it's Windows Defender, using the disk with most free space available to store TEMP files. So much for $TEMP. Safe to delete btw.