By default, Simbrief gives the VIBAS3X STAR for flights comming from the east of Malaga (such as LEPA->LEMG) as it’s the shortest route between both airports.
VIBAS3X for Runway 13 is only plannable between 2300 and 0600UTC and the rest hours is up to the ATC.
Official information:
Spanish AIP: AIP España
LEMG STAR RNAV1 charts: https://aip.enaire.es/AIP/contenido_AIP/AD/AD2/LEMG/LE_AD_2_LEMG_STAR_1_en.pdf
LEMG STAR RNAV1 charts for night operations: https://aip.enaire.es/AIP/contenido_AIP/AD/AD2/LEMG/LE_AD_2_LEMG_STAR_2_en.pdf