Rename files to lower case

I have a number of files of the form

icc.txt.$FOObar.log

eg.

icc.txt.Visin.log icc.txt.tryanything.log
icc.txt.WillsGambit.log icc.txt.tsia68.log
icc.txt.WilmaP.log icc.txt.tumoana.log
icc.txt.Wonderbugg.log icc.txt.twintower.log
icc.txt.WzeroMN.log icc.txt.upsan.log
icc.txt.Xerses.log icc.txt.vaknight.log

$FOObar can be made up of

* numbers
* lower case characters
* upper case character
* Hypen

Can anyone suggest a way I can rename them, such that any upper case characters are converted to lower case, but all other characters are not changed.

i.e. icc.txt.Visin.log would change to icc.txt.visin.log.
.

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