The 50-minute recording appears to be of a meeting of his inner circle on 18 December.
According to AFP, Shekau said the gathering had been called to discuss “those elements grumbling over” the killing of “Tasiu”, also known as Abu Zinnira, who had appeared in several Boko Haram propaganda messages.
Shekau is known for clamping down on dissent among his followers, although this has further alienated some of his fighters.
Opposition to Shekau’s leadership led some militants to break away and form the al-Qaeda-linked Ansaru and the so-called Islamic State faction in the Lake Chad Basin.
Both groups accused Shekau of killing several Boko Haram members unjustly and opposed his sanctioning of attacks and kidnappings affecting Muslim members of the public.
In this latest broadcast Shekau does not address any of the criticisms.