The name suggests it is a "leecher" tool (often used for scraping data or harvesting combo lists for credential stuffing) [1].
Based on a search of available information, there is no reputable or widely documented content regarding a file named "Joker Combo Leecher [v1.0].rar". Joker Combo Leecher [v1.0].rar
If you are looking for legitimate data testing tools, I can help you find ethical alternatives. Are you interested in: tools? Security testing software? Password security best practices? The name suggests it is a "leecher" tool