A new malware campaign leveraged two zero-day flaws in Cisco networking gear to deliver custom malware and facilitate covert data collection on target environments.

Cisco Talos, which dubbed the activity ArcaneDoor, attributing it as the handiwork of a previously undocumented sophisticated state-sponsored actor it tracks under the name UAT4356 (aka Storm-1849 by Microsoft).

“UAT4356 deployed two backdoors as components of this campaign, ‘Line Runner’ and ‘Line Dancer,’ which were used collectively to conduct malicious actions on-target, which included configuration modification, reconnaissance, network traffic capture/exfiltration and potentially lateral movement,” Talos said.