A YouTube user uploaded the handheld or camera phone capture of the trailer, which had Spanish subtitles on the screen.
As the footage plays, numerous commentators' voices overlap one another with their opinions of the superheroes, including "We as a population on this planet have been looking for a savior" and "Maybe he's just a guy trying to do the right thing."
A blurred image of Ben Affleck's face appears shortly before a masked Batman appears, followed by the two superheroes coming face to face.
The highly anticipated footage was set to premiere in Imax theaters on Monday.
On Wednesday morning, Snyder teased the trailer by releasing a short excerpt on Twitter.
Batman v. Superman: Dawn of Justice will be released on March 25, 2016 and stars Ben Affleck as Batman and Henry Cavill as Superman. The film also stars Amy Adams.
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