If len ( addrs ) = 3 : length = addrs data = idc. get_operand_value ( ea, 0 ))) # get key, data, length decode () start = 0x401301 end = 0x4031E5 ea = start addrs = dec = '' key = b '' data = b '' length = 0 while ea <= end : # check if opperand is immediate Import idc def dec_str ( key, data, length ): res = bytearray () for i in range ( length ): res. “Every section of the code has a comment to make it readable for you” We just do text = xor(key, cipher) for every encrypted text by automating it with IDAPython. The encryption algorithm is pretty easy and straight forward. Vidar tries to decrypt it with the first function before starting any process. I faced some problems in my sample, all strings are encrypted and dlls are dynamic allocated. You can watch this video which describes the operation from server side. The collection will be something like that (I got it from sandbox so I lost some data because sandbox doesn’t contain everything)Ĭompress them in. Vidar collects All important data from victim’s device then Uploads them to C2 server and delete these files from the device with taskkill.exe This is the basic config from Hatching sandbox.
I will give a brief overview of how Vidar operates then I will go into details in the upcoming sections. For this in-depth analysis, I will inspect the 49.7 version of Vidar.īefore starting, I want to thank my friend because he helped me a lot to write this report. Vidar’s clients have access to a C2 Shop portal where they are able to generate their own payloads.
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How to understand the configuration format.
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