Drug-resistant 'antibody' produced by drug-resistant malaria parasites is a group of protein combinations which is specifically resistant to antimalarial drugs. The group of protein combinations is manipulated by 3D genome architecture. Mutated genes and mutations in non-coding DNA sequences might help to maintain the drug-resistance-associated 3D genome architecture, which will make malaria parasites become permanently resistant. The detailed explanation is presented in the following article:
Drug Resistance in Malaria Parasites: Does “Specific Antidrug Substance” Exist?
https://www.researchgate.net/publication/367531851_Drug-Resistant_Malaria_Parasites_Produce_'Antibody'_against_Antimalarial_Drug_Efficacy