Jalas is a joke type malware. These harmless programs display fake error messages on screen warning of destructive actions, simulate these actions or change the mouse or screen settings.
In this particular case, Jalas displays a message in Portuguese, asking if the user wants some windows to be opened on the screen. The message has two buttons: Sim (Yes) and Nao (No). Both buttons interchange their positions when the user attempts to click the Nao button, thus making it impossible to be pushed.
If the user finally pushes the Sim button, up to fifty one messages are opened on screen, with different texts, such as Cromo!!!!, Pato, Tanso, etc.
If the user does not want these windows to be opened, it is necessary to close the original message, using the Close button, in its upper right corner.