Troj/Delf-KA is a password stealing Trojan.
On execution the Trojan will copy itself to the Windows system folder as TAPI32INIT.EXE and also drop the file TAPI32INIT.DLL (detected as Troj/Delf-KA) into this folder.
So as to run on system startup, the Trojan will create the following registry entry:
HKLM\SOFTWARE\Microsoft\Active Setup\Installed Components\ (6M8A6G00-3I18-11C0-821H-444200140P0S)\
StubPath=
C:\WINDOWS\System32\Tapi32init.exe
Troj/Delf-KA will continually monitor and reset this registry entry to make removal more difficult.
In the background the Trojan will try to steal passwords entered on the computer and submit these to a remote website.