One Ecuadorian scary story is about the 'La Llorona'. It's said that a woman, after losing her children, wanders near rivers and streams, crying and looking for them. At night, people claim to hear her wailing, which sends chills down their spines.
One Ecuador dark story could be about the legends of haunted places in the old colonial buildings. Some people claim to have seen strange apparitions there at night.
One specific dark story is about an old hacienda. Workers there reported hearing strange noises at night. It was said that the owner of the hacienda in the past had mistreated the workers terribly. Some believe that the tortured souls of those workers still roam the place, seeking revenge. There were tales of unexplained disappearances of people who visited the hacienda at night. It seems that the dark history of the place has left a lingering presence that continues to spook those who are brave or foolish enough to enter.
I don't have enough information to say for sure. It could be fiction, or it could have roots in reality that have been adapted or exaggerated for a particular purpose.
The story of 'El Silbón' is quite terrifying. El Silbón is a spectral figure in Ecuadorian folklore. He is often depicted as a young man who was cursed for disrespecting his father. He is condemned to roam the earth, carrying the bones of his father in a sack. He whistles a shrill tune as he moves through the night. People who hear his whistle are said to be in danger. It is believed that if you are unlucky enough to cross his path, he may bring misfortune or even death. His appearance is often described as gaunt and pale, with hollow eyes, and his whistle can be heard from a distance, freezing those who hear it in fear.