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Russia’s military intelligence unit has been targeting Ukrainian Android devices with “Infamous Chisel,” the tracking name for new malware that’s designed to backdoor devices and steal critical information, Western intelligence agencies said on Thursday.
“Infamous Chisel is a collection of components which enable persistent access to an infected Android device over the Tor network, and which periodically collates and exfiltrates victim information from compromised devices,” intelligence officials from the UK, US, Canada, Australia, and New Zealand wrote. “The information exfiltrated is a combination of system device information, commercial application information and applications specific to the Ukrainian military.”
A “serious threat”
Ukraine’s security service first called out the malware earlier this month. Ukrainian officials said then that Ukrainian personnel had “prevented Russia’s intelligence services from gaining access to sensitive information, including the activity of the Armed Forces, deployment of the Defense Forces, their technical provision, etc.”
Infamous Chisel gains persistence by replacing the legitimate system component known as netd with a malicious version. Besides allowing Infamous Chisel to run each time a device is restarted, the malicious netd is also the main engine for the malware. It uses shell scripts and commands to collate and collect device information and also searches directories for files that have a predefined set of extensions. Depending on where on the infected device a collected file is located, netd sends it to Russian servers either immediately or once a day.
When exfiltrating files of interest, Infamous Chisel uses the TLS protocol and a hard-coded IP and port. Use of the local IP address is likely a mechanism to relay the network traffic over a VPN or other secure channel configured on the infected device. This would allow the exfiltration traffic to blend in with expected encrypted network traffic. In the event a connection to the local IP and port fails, the malware falls back to a hard-coded domain that’s resolved using a request to dns.google.
NotPetya wiper attacks of 2017, a global outbreak that a White House assessment said caused $10 billion in damages, making it the most costly hack in history. Sandworm has also been definitively tied to hacks on Ukraine’s power grid that caused widespread outages during the coldest months of 2016 and again in 2017.
