Downloads:

Software:

Malwarebytes 

atf-cleaner

SUPERAntiSpyware

RootRepeal

Dr.Web CureIt

Online scanners:

Virus total – You can submit a file to be checked with a few scanning engines.

Articles:

ndis.sys infection removal http://www.bleepingcomputer.com/forums/lofiversion/index.php/t235486.html