File size change?

I went to redown honorbuddy and got a warning from trend micro about a possible virus. It appears I had already downloaded the newest version about 2 weeks ago. It looks like in the last 2 weeks Honorbuddy.exe was renamed to Honorbuddy.bak and a new program was added. Also another file Thumb.db is also now in the dir.

Honorbuddy 2.5.6948.557.zip - ZIP archive, unpacked size 19,935,446 bytes
Honorbuddy 2.5.6948.557(2).zip - ZIP archive, unpacked size 20,328,662 bytes

 

How many files should be in the zip that returns from? http://updates.buddyauth.com/GetNewest?filter=Honorbuddy

if exist "%s" goto start^M
^@^@del /f /q "%s"^M
^@^@^@^@:start^M
^@^@^@^@w^@^@^@%s\temp\temp%d.bat^@^@wb^

That doesn't look like honorbuddy.exe

 

the update server packs the latest versions of honorbuddy on the fly, its possible that theres a diffrence if we needed to make a change.