A new Distributed Hash Table (DHT) protocol based botnet dubbed Mozi attacks routers with weak passwords and known exploits. The botnet appears to be active at least from September 03, 2019.
DHT is a decentralized distributed that provides lookup service similar to key pair stored in DHT and retrieves a value based on the associated key. The protocol is mainly used in torrent clients and other peer-to-peer file-sharing platforms.
Mozi Botnet uses DHT protocol to quickly establish a network and to hide the payload with a vast amount of regular DHT traffic.
Security researchers at 360 Netlab discovered a suspicious file that reuses part of the Gafgyt malware code, further analysis reveals that “P2P botnet implemented based on the DHT protocol, researchers called it as Mozi based on its propagation sample.”
The botnet relies on the custom P2P network, uses ECDSA384 and the xor algorithm to ensure integrity and security. The botnet can perform the following functions
- DDoS attack
- Collecting Bot Information
- Execute the payload of the specified URL
- Update the sample from the specified URL
- Execute system or custom commands
The botnet starts infection using any random local port to start a local HTTP service to provide malware samples for download or to retrieve the samples from the address present in the config file. It uses weak passwords or uses known to compromise the targeted device.
Following are the vulnerabilities Exploited
Once it infected the target device, it joins the device Mozi P2P network and the device becomes like the new Mozi Bot node and starts infecting other devices.
Based on the data collected by 360 Netlab honeypot devices, the campaign is ongoing and the infection has been increasing.
Users are recommended to patch the vulnerabilities and to set up a strong password to avoid infection. Technical details can be found in the 360 Netlab blog post.
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