MyDoom.BF appeared on February 20th, 2005. It is a minor variant of MyDoom.BB. MyDoom.BF uses a different site from which the worm attempts to download the additional Backdoor (Backdoor.Win32.Surila.o). This variant is not packed with executable compressor. For more details, please see Mydoom.BB
Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.