ABSTRACT This article presents an ethnographic analysis of the online training practices IS sympathisers adopt to recruit, indoctrinate, train, and vet new affiliates. The study highlights the carefully crafted virtual ecosystem established by IS unofficial media operatives, which seeks to identify and select converts with specialised digital skills and unwavering commitment to the group’s vision of Islam. Prioritising quality over quantity, the selection process subjects new recruits to rigorous pre-and post-selection trials to ensure their authenticity, devotion, and obedience. Oaths of allegiance are central to membership within this virtual ecosystem, engendering a master-apprentice dynamic that may secure new recruits’ adherence to assigned duties within the network. The instructional scaffolding within this ecosystem comprises two main constituents: theological indoctrination and digital training. The former places emphasis on IS’s allegedly authentic religious sources in teaching Islamic jurisprudence, while the latter includes training on online security and media campaigns. As sympathisers progress through the ranks within the virtual ecosystem, they are empowered by their newly achieved “veteran” status to take on leadership roles within the digital sphere or engage in combat operations. The meticulously engineered architecture of social hierarchies within the network is designed to foster loyalty and obedience, perpetuate a hierarchical fraternity, thereby enhancing the organisation’s resilience and longevity.