Help to understand security log

My log for “404 Error” says

=======
Details for /wp-content/themes/tess/download.php

Time: 2014-12-20 14:11:43
Host: 108.161.183.122
Referrer:
Query: file=../../../wp-config.php
Time: 2014-12-20 03:48:48
Host: 37.1.195.151
Referrer:
Query: file=../../../wp-config.php
Time: 2014-12-20 03:14:03
Host: 37.1.195.151
Referrer:
Query: file=../../../wp-config.php
Time: 2014-12-18 00:43:02
Host: 108.161.176.122
Referrer:
Query: file=../../../wp-config.php
Time: 2014-12-17 09:29:09
Host: 108.161.183.122
Referrer:
Query: file=../../../wp-config.php

======

I did not find any theme named “tess”. I have no file there as “/wp-content/themes/tess/download.php”

What did this really mean?

Help needed to understand this.

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