REBOOT OR, BETTER yet, REPLACE YOUR OLD ROUTERS! — Chinese malware removed from SOHO routers after FBI issues covert commands Routers were being used to conceal attacks on critical infrastructure.
Dan Goodin – Jan 31, 2024 11:34 pm UTC Enlarge / A Wi-Fi router.Getty Images | deepblue4you reader comments 52
The US Justice Department said Wednesday that the FBI surreptitiously sent commands to hundreds of infected small office and home office routers to remove malware China state-sponsored hackers were using to wage attacks on critical infrastructure.
The routersmainly Cisco and Netgear devices that had reached their end of lifewere infected with whats known as KV Botnet malware, Justice Department officials said. Chinese hackers from a group tracked as Volt Typhoon used the malware to wrangle the routers into a network they could control. Traffic passing between the hackers and the compromised devices was encrypted using a VPN module KV Botnet installed. From there, the campaign operators connected to the networks of US critical infrastructure organizations to establish posts that could be used in future cyberattacks. The arrangement caused traffic to appear as originating from US IP addresses with trustworthy reputations rather than suspicious regions in China. Seizing infected devices
Before the takedown could be conducted legally, FBI agents had to receive authoritytechnically for whats called a seizure of infected routers or “target devices”from a federal judge. An initial affidavit seeking authority was filed in US federal court in Houston in December. Subsequent requests have been filed since then.
“To effect these seizures, the FBI will issue a command to each Target Device to stop it from running the KV Botnet VPN process,” an agency special agent wrote in an affidavit dated January 9. This command will also stop the Target Device from operating as a VPN node, thereby preventing the hackers from further accessing Target Devices through any established VPN tunnel. This command will not affect the Target Device if the VPN process is not running, and will not otherwise affect the Target Device, including any legitimate VPN process installed by the owner of the Target Device.
Wednesdays Justice Department statement said authorities had followed through on the takedown, which disinfected “hundreds” of infected routers and removed them from the botnet. To prevent the devices from being reinfected, the takedown operators issued additional commands that the affidavit said would “interfere with the hackers control over the instrumentalities of their crimes (the Target Devices), including by preventing the hackers from easily re-infecting the Target Devices.” Advertisement
The affidavit said elsewhere that the prevention measures would be neutralized if the routers were restarted. These devices would then be once again vulnerable to infection.
Redactions in the affidavit make the precise means used to prevent re-infections unclear. Portions that werent censored, however, indicated the technique involved a loop-back mechanism that prevented the devices from communicating with anyone trying to hack them.
Portions of the affidavit explained: 22. To effect these seizures, the FBI will simultaneously issue commands that will interfere with the hackers control over the instrumentalities of their crimes (the Target Devices), including by preventing the hackers from easily re-infecting the Target Devices with KV Botnet malware. a. When the FBI deletes the KV Botnet malware from the Target Devices [redacted. To seize the Target Devices and interfere with the hackers control over them, the FBI [redacted]. This [redacted] will have no effect except to protect the Target Device from reinfection by the KV Botnet [redacted] The effect of can be undone by restarting the Target Device [redacted] make the Target Device vulnerable to re-infection. b. [redacted] the FBI will seize each such Target Device by causing the malware on it to communicate with only itself. This method of seizure will interfere with the ability of the hackers to control these Target Devices. This communications loopback will, like the malware itself, not survive a restart of a Target Device. c. To seize Target Devices, the FBI will [redacted] block incoming traffic [redacted] used exclusively by the KV Botnet malware on Target Devices, to block outbound traffic to [redacted] the Target Devices parent and command-and-control nodes, and to allow a Target Device to communicate with itself [redacted] are not normally used by the router, and so the routers legitimate functionality is not affected. The effect of [redacted] to prevent other parts of the botnet from contacting the victim router, undoing the FBIs commands, and reconnecting it to the botnet. The effect of these commands is undone by restarting the Target Devices.
23. To effect these seizures, the FBI will issue a command to each Target Device to stop it from running the KV Botnet VPN process. This command will also stop the Target Device from operating as a VPN node, thereby preventing the hackers from further accessing Target Devices through any established VPN tunnel. This command will not affect the Target Device if the VPN process is not running, and will not otherwise affect the Target Device, including any legitimate VPN process installed by the owner of the Target Device. Page: 1 2 Next → reader comments 52 Dan Goodin Dan Goodin is Senior Security Editor at Ars Technica, where he oversees coverage of malware, computer espionage, botnets, hardware hacking, encryption, and passwords. In his spare time, he enjoys gardening, cooking, and following the independent music scene. Advertisement Channel Ars Technica ← Previous story Next story → Related Stories Today on Ars
