Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Order: Stylommatophora
Family: Ariophantidae
Genus: Cryptozona Mörch, 1872
Species: Cryptozona siamensis (L.Pfeiffer, 1856)
Found it creeping among leaf litters.
Same species I guess: https://www.inaturalist.org/observations/49027217
Around the small river
Dead but mostly intact