|Remote Access Trojan
|Tenda Router AC15 AC1900
|All (hardware specific exploit)
Mirai and Mutants
Mirai malware scans the Internet for IoT devices that run on the Argonaut RISC Core (ARC) processor, which runs a stripped down version of the Linux OS. This malware has all the capabilities of a virus/worm/Trojan. A few well known variants of Mirai that are in the wild are Okiru, Satori, Masuta and PureMasuta. Mirai started its operations in the latter part of 2016, and published its source code which led to the inception of various mutants or variants in the wild. Mirai targeted mostly service providers.
Ttint is an IoT botnet based on Mirai source code, with added functionalities of command execution and intranet roaming via compromised routers, unlike Mirai that normally orchestrates DDoS attacks. This variant of Mirai uses the following custom control functions as well:
- SOCKS5 proxy for routers
- Router DNS tampering at router level
- Custom IP tables for traffic redirection
- Custom system command execution
- WebSocket over TLS [WSS] protocol for C2 communication
- Reverse Shell
- Self Upgrade
Ttint exploits two vulnerabilities, of which one was patched recently (CVE-2020-10987) and the other one remains undisclosed and unpatched. The vulnerability that was patched recently (CVE-2020-10987) targets Tenda routers AC15 AC1900, which allows attackers to execute arbitrary system commands via the “deviceName” POST parameter.
Other Tenda AC15 AC1900 vulnerabilities are:
- Ttint targets Tenda routers to build the botnet. As a result, any consumer who uses the vendor’s hardware will be a target of the attack.
- Once the router is compromised, the attacker can access the internal network behind the router, enabling attacks on other machines.
- A Remote Access Trojan has espionage capabilities and can create the digital footprint of its victims.
- DDoS attacks by the botnet can take down critical services leading to downtime, affecting availability of business to clients and eventually causing financial loss.
- Loaded with the ability to manipulate network traffic, confidentiality, and integrity are compromised.
- Spam mailing.
- Ttint steals credit card information.
- This IoT botnet performs click fraud.
- It is also capable of solving weak CAPTCHA challenges on websites.
- Proper patch and updates management.
- Deploying efficient and robust EDR/ XDR solutions on endpoint systems.