BCMPUPnP_Hunter: A 100k Botnet Turns Home Routers to Email Spammers

description: Since September 2018, 360Netlab Scanmon has detected multiple scan spikes on TCP port 5431, each time the system logged more than 100k scan sources, a pretty large number compared with most other botnets we have covered before. The interaction between the botnet and the potential target takes multiple steps, it starts with tcp port 5431 destination scan, then moving on to check target’s UDP port 1900 and wait for the target to send the proper vulnerable URL. After getting the proper URL, it takes another 4 packet exchanges for the attacker to figure out where the shellcode's execution start address in memory is so a right exploit payload can be crafted and fed to the target. At the beginning we were not able to capture a valid sample as the honeypot needs to be able to simulate the above scenarios. We had to tweak and customize our honeypot quite a few times, then finally in Oct, we got it right and successfully tricked the botnet to send us the sample (we call it BCMUPnP_Hunter).

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