Malwarebytes - Malwarebytes protects you against malware, ransomware, and other advanced online threats that have made antivirus obsolete and ineffective. Free Anti-Malware & Malware .
GSplit - GSplit is a free file splitter that splits any file into smaller files called pieces. Lots of customization options, attractive and easy-to-use interface.
GridinSoft Anti-Malware - GridinSoft Anti-Malware is an antimalware program to seamlessly kick out any sneakiest and nasty malware with ease.
Batch File Split & Join - Split and merge multiple text or binary files in either character, line, or byte modes. When splitting files, you can split on certain text or binary separator; target given number of parts; or target specific part size. Join files on lines/bytes.
Emsisoft Anti-Malware - Emsisoft Anti-Malware for best real-time protection against ransomware and other malware with dual scanner, behaviour blocker and more advanced features.
HJSplit - HJSplit is a popular set of freeware file-splitting programs created by Freebyte.