Madoka.exe

Lost madoka.exe, mostly known as the Ghost virus or the Sadako virus in Japan, is a Japanese joke program, which is a variant of the Win32/FlaGhost Malware.

When the user runs the program, a picture of a Japanese woman in full-screen is displayed briefly, before disappearing. Some Chinese text is then displayed in the upper-left corner of the screen. However, a ghost version of the woman image will appear along with a scream sound effect. When the screamer ends, the virus immediately returns to the woman picture. The picture will appear suddenly.