Troj/Keylog-O is a keylogging Trojan.
Troj/Keylog-O creates a copy of itself in the Windows system folder with the filename svch0st.exe and creates the following registry entries so that the Trojan is run when a user logs on to Windows:
HKLM\Software\Microsoft\Windows\CurrentVersion\Run\
svchost.exe = <system>\svch0st.exe
HKLM\Software\Microsoft\Windows\CurrentVersion\RunOnce\
svchost.exe = <system>\svch0st.exe
HKLM\Software\Microsoft\Windows\CurrentVersion\Run\
taskmgr.exe = <system>\svch0st.exe
HKLM\Software\Microsoft\Windows\CurrentVersion\RunOnce\
taskmgr.exe = <system>\svch0st.exe