WAP-billing trojans are making a comeback, with four new strains becoming active in the second quarter of 2017, targeting Russia and India primarily. Four new strains of malware, Ubsod, Xafekopy, Autosus, and Podec, were discovered by Kaspersky Lab mobile security expert Roman Unuchek. WAP billing was popular at the start of the 2000s when WAP was a popular method of paying for content online in the early stages of mobile networks. Since then, it has been replaced by premium SMS numbers and mobile wallet solutions like PayPal, Apple Pay, Samsung Pay, and others.
Source: https://www.bleepingcomputer.com/news/security/researchers-cant-explain-why-wap-billing-trojans-are-making-a-comeback/