is a notorious piece of malware, specifically a computer worm , that primarily targeted Polish users through instant messaging platforms like Gadu-Gadu and Skype in the mid-to-late 2000s.

The name translates from Polish to "video from Majka.exe," using social engineering to trick users into thinking they were receiving a video file from a friend named Majka. Key Characteristics and Behavior

: It automatically sent copies of itself to every contact in the infected user's list.

: While its primary goal was spreading, versions of this worm often opened "backdoors," allowing attackers to remotely control the infected PC or steal sensitive data like passwords and login credentials.

: It typically added itself to the Windows registry or "Startup" folder to ensure it ran every time the computer was turned on.

: It exploited a common Windows setting that hides file extensions for known file types. Users would see "filmik od majki" and an icon resembling a video player, unaware that the hidden .exe suffix meant it was an executable program rather than a media file. Impact and Legacy