The Malagasy brush warbler is a widespread species of forest undergrowth and is found primarily in both Madagascar and the Comoro Islands.

The Malagasy brush warbler scavenges for food low to the ground in bushes and thick shrubs.

The Malagasy brush warbler eats alone or in pairs of 2 for a vast majority of the time when searching for food.

In Eastern Madagascar, the Malagasy brush warbler breeds from the months of July to December, primarily from September to November.

In the Comoro Islands, the bird is exclusively found in forested ridges above 400 meters among the dense evergreens of Mohéli.

They are also found in a variety of habitats on the neighboring island of Anjouan in the dense undergrowth of forests, plantations, coastal thickets, and wetlands.