Based on the following extract from the log of a compromised machine, what is the hacker really trying to steal?

har.txt is not a standard Windows system file containing credentials; it holds no value as a target for password or account data theft.

The SAM file is the Windows Security Account Manager database that stores hashed credentials for all local user accounts and is a primary target for credential theft. Attackers commonly retrieve a backup copy from the %SystemRoot%\repair directory, which is created during system setup and is accessible even while the live SAM is locked by the operating system. Obtaining the SAM file allows the attacker to conduct offline brute-force or rainbow table attacks against the stored password hashes.

wwwroot is the default web server document root directory and contains web content, not user credential hashes stored in the SAM database.

The repair directory is the location from which the attacker retrieves the SAM backup, not the item of value itself; the SAM file stored within that directory is the actual credential target.