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Let’s take a look what the value of “fpzkgo” consists of. Their names are random strings and only the value of “fpzkgo” is valid data. There are also four “Cookies”: “fpzkgo”, “bcfs”, “hky” and “otxe”. The URL “/cgi-bin/req5” is a decrypted constant string, and the host is the first C2 server I mentioned above. The following image, Figure 3.1, was taken when the first request was about to be SSL-encrypted by calling the API EncryptMessage().Īs you can see, this is a GET request. The traffic between Bazar and its C2 server is encrypted via SSL protocol.
It then attempts to connect to the others if the first one does not work. Bazar prioritized connecting to the first C2 server host. They are "miraclecarwashanddetallcom:443" and a group of additional hosts: “caexidombazar”, “ektywyombazar”, “emliwyywbazar”, “uhymekedbazar”, “ibykwyywbazar”, and “elicuhembazar". The C2 server host strings are decrypted constant strings. The thread function connects to the C2 server and sends data to it. In its working function, after Bazar does some initial work, such as setting environment variables, creating mutex objects, loading APIs and setting global variables, it creates a thread to perform its tasks in the thread function.
The pseudocode of how they work together is shown in Figure 1.1, below.Īccording to Figure 2.1, the encrypted data (“3C 37 4B 50 29”) was copied from the stack and decrypted to “POST” before using it. When a condition is matched, the working function is called once. In its Main() function, we can see that it is driven by a “Timer” set by the API SetTimer() and then captured by GetMessageA(). This variant of the Bazar payload is a 64-bit executable file written in Microsoft Visual C++ 8.0. You will learn what new anti-analysis techniques this Bazar uses, how it communicates with its C2 server, what sensitive data it is able to collect from the victim’s device, and how it is able to deliver other malware onto the victim’s system. In this second part, I will focus on the Bazar payload file that runs inside the “cmd.exe” process. In the first part of the analysis, I explained how the Bazar loader was downloaded onto a victim’s device, how it communicates with its C2 server to obtain a Bazar file, and how that file is then injected into a newly-created “cmd.exe” process. My analysis of this variant is being published in two parts. Additional research on this executable file found that it is a new variant of the Bazar malware.
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Impact: Control and Collect sensitive information from victim’s device, as well as delivering other malware.įortiGuard Labs recently detected a suspicious email through the SPAM monitoring system that was designed to trick a victim into opening a web page to download an executable file.