A Chinese state-sponsored advanced persistent threat (APT) called BlackTech was caught modifying router firmware on Cisco routers to maintain stealthy persistence and pivot from international subsidiaries to corporate headquarters.


The NSA and FBI warn that a Chinese state-sponsored APT called BlackTech is hacking into network edge devices and using firmware implants to silently hop around the corporate networks of the U.S. and Japanese companies.

The attackers used a variety of methods to exploit the Cisco routers, including:

Exploiting vulnerabilities in the Cisco IOS firmware.
Using social engineering techniques to trick victims into installing malicious firmware.
Replacing legitimate firmware with malicious firmware.
Once the attackers had compromised a router, they would use it to launch further attacks on the network, such as stealing data or installing malware on other devices.

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Hackers Caught Hiding in Cisco Router Firmware.