What type of hack is this ?

First time I saw this in my log watch for my httpd

Attempts to use 4 known hacks were logged 772 time(s)
cmd.exe by
216.204.137.75 4 time(s)
142.162.140.228 244 time(s)
\/c\+dir by
216.204.137.75 4 time(s)
142.162.140.228 256 time(s)
root.exe by
142.162.140.228 8 time(s)
\/c\+dir\+c by
142.162.140.228 256 time(s)

A total of 2 sites probed the server
216.204.137.75
142.162.140.228




Can any one please tell me what type of hacks are these, and what it try to accomplish ..

Thanks

 

 

 

 

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