There are no common symptoms associated with this threat. Alert notifications from installed antivirus software may be the only symptom(s).
VirTool:WinNT/Sefprop.A is a trojan that prevents certain processes from executing and hides certain registry subkeys. The trojan may be installed by other malware such as Exploit:Win32/CVE-2010-4398.
What to do now
To detect and remove this threat and other malicious software that may be installed on your computer, run a full-system scan with an appropriate, up-to-date, security solution. The following Microsoft products detect and remove this threat: