911 S5 was likely the largest residential proxy service and botnet with over 19 million compromised IP addresses in over 190 countries and confirmed victim losses in the billions of dollars.
Free, illegitimate VPN applications that were created to connect to the 911 S5 service are: MaskVPN, DewVPN, PaladinVPN, ProxyGate, ShieldVPN, and ShineVPN.
Unaware of the proxy backdoor, once users downloaded these VPN applications, they unknowingly became a victim of the 911 S5 botnet. The proxy backdoor enabled 911 S5 users to re-route their devices through victims’ devices, allowing criminals to carry out crimes such as bomb threats, financial fraud, identity theft, child exploitation, and initial access brokering. By using a proxy backdoor, criminals made nefarious activity appear as though it was coming from the victims’ devices.
https://www.fbi.gov/investigate/cyber/h ... -backdoors
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