could "modified" software have virus?

[kenny1999]

I downloaded a software from a trusted and official server, and then I downloaded some small files from an untrusted server which were used to "modify" the software, the small files are in DLL format which were assigned to replace the original DLL under the program directory. I did it and the program is "modified" nicely. However, I would like to know if there could be any virus or hidden risks in my situation. Is it likely that for DLL format files to contain harmful virus or any other bad things

 

[voyagerfan99]

Sounds like you downloaded a crack for the genuine software you downloaded. We don't support stuff like that on this forum.

Advice on how to crack or circumvent legitimate software activation. This includes: key generators; cracked executable files; re-arming software trial periods; brute force methods for obtaining activation keys; OEM activation hacks, etc.