New Folder.exe regsvr.exe deleter in python

I would like to write script which deletes New Folder.exe regsvr.exe viruses: My algorithm is following:

1. Get current working directory
2. check if this directory contains fil开发者_运维知识库e with extension .exe and size = 646656 bytes
3. if there is/are such file/s delete
recursiveley do the steps 1-3 to subfolders of parent folder

I want to ask you about efficiency: Since the root folder may contain thousands folders how it be better implement which imports to use?

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Just use os.walk() to recursively walk the file tree, and os.stat() on the file paths it gives you as it goes.