Sounds emitted by approaching objects are generally perceived as more salient than those of receding ones, in an effect termed the “auditory looming bias”. Its origin has been hypothesized to lie in evolutionary processes, reflecting a hazard protection mechanism. Yet, as differences between looming and receding sounds can, among others, also be learned through non-threatening multisensory information, this hypothesized association to threat perception is subject to debate. Aiming to investigate the bias’ generator sources on the cortex, we analyzed the corticocortical connectivity underlying electroencephalographical recordings; those had previously been used to examine and evince the preferential processing of looming sounds under different attentional states and cue types. The applied connectivity methods were based on the measures of temporal non-reversibility and normalized directed transfer entropy. Our findings suggest a temporofrontal connectivity pattern, denoting a bottom-up directed stream of information. The implicated cortical regions emerged largely on the ventral 'what' auditory pathway, instead of the dorsal 'where' one, even though the participants' task was solely focused on the discrimination of movement direction. Those crucial contributor regions have moreover been typically linked to threat and fear responses in prior literature. These results support the idea, that the perceptual bias towards looming sounds reflects an auditory threat detection mechanism, while offering insights into the neural function behind the processing of ecologically relevant environmental cues.