Troj/Pasta-B is a Trojan for the Windows platform.
When run Troj/Pasta-B creates the files:
<Program Files>\Emailer.exe - detected as Troj/Pasta-B
<Program Files>\457\474\Uninstall.exe - can be safely removed
<Program Files>\457\474\Uninstall.ini - can be safely removed
Troj/Pasta-B also creates registry entries under:
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\474 457\
Troj/Pasta-B also modifies the HOSTS file denying access to certain websites.