: The file arrived as an attachment or a link in a message that looked like it came from a known contact. The message usually used casual, enticing language (e.g., "look at this video") to encourage the recipient to click. Worm Mechanics : Once executed, the .exe file would:

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.

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

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