The Indochinese forest rat has brown upperparts, a white underside, and a tail longer than its head and body. It is nocturnal and omnivorous in forest settings.
Descriptions of holotypes and other specimens assigned to this species report a large rat with rich-brown upperparts, white underparts, and a tail longer than the head and body.
It is nocturnal and omnivorous. A 2025 survey on a Thai island recorded it in both human-disturbed forest and national park forest transects, using captures and camera records.
An extinction-risk assessment has not been added yet.