There's a new hacking group in cyberspace, and it's going after the Islamic State's online propaganda.

Last week, less than 24 hours after ISIS social media accounts posted a threatening message from the group's leader, the audio recording was replaced with a song and its transcript with a logo resembling that of the Egyptian military, accompanied by a writing in Arabic that read "Egyptian Cyber Army."

Abu Bakr al-Baghdadi's recording had been hacked, and the operation carried all the hallmarks of a group such as the Syrian Electronic Army.