1. Introduction
We recently deployed a high interaction honeypots#expecting it to be compromised by a specific malware. But in the first few days, instead of getting infected by the expected malware, it received a variety of attacks ranging from SSH port forwarding to “Viagra and Cialis” SPAM to XORDDoS failed deployment attempts. By the third day, it was insistently hit and compromised by Rakos, a Linux/Trojan.
Based on the expected Rakos behavior reported last December by ESET [1], our honeypot was recruited to a botnet and immediately began attempting connections to other hosts on the Internet, both to “call home” and to search for new victims. Although it wasn’t our initial plan, we noticed that this sample didn’t behave like the one ESET described, which got us curious and made us analyze it here at Morphus Labs.
After analyzing and exploiting this botnet’s communication channel and employing Crawling and Sensor Injection enumeration methods, we did find a network floating around 8,300 compromised devices per day spread over 178 countries worldwide. Considering the recent DDoS attack reported by Incapsula [2] against a US College, originated from 9,793 bots, which was able to generate 30,000 requests per second during 54 hours, we may infer how potentially threatening is Rakos botnet.
2. Botnet C&C channel analysis
To better understand this P2P Transient botnet behavior and its C&C protocol, we listened to its traffic for 24 hours, and after analyzing it, we noticed two kinds of communications: one between bots through HTTP and, the other, between bots and C&C servers through TLS/SSL. In this section, we detail the commands we mapped.
Some definitions before start:
Checker: An infected machine (“bot”) that is part of the botnet.
Skaro: C&C server
A particular node may play both roles
Continued.....
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