Original 7-Zip does not have a file named SevenZip.exe, so the software you have got is not 7-Zip. It may well be legitimate though (for example, it might be a clone of 7-Zip with similar capabilities), but in this case its installer should clearly state the difference. If it does not, then you would better uninstall your program and, perhaps, perform a full system scan with your antivirus.
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