This is no surprise, because harder evidence of a technical nature points to an inside leak, not hacking — by Russians or anyone else.
The overall process for reversing this firmware is pretty straight forward: The first step is to locate any identifiable data sections in the firmware image: Jul 05, Fri Sep 4 Tue Jul 14 Mon Jul 20 Looking through a hex dump of the firmware, the gzipped Web files do look to be part of a simple file system, similar to the the OW file system discussed previously.
However, the Web files are not particularly relevant for the purposes of this discussion, so I will forgo an analysis of the file system here; if desired, these files can simply be extracted from the firmware image and gunzipped.
There were four LZMA signatures found, but all except one have very large uncompressed sizes several hundred MB eachso these are probably false positives. Copyright 2 30 30 34 2d 32 30 30 35 20 43 79 62 65 72 54 41 CyberTA 4e 20 4c 69 6d 69 74 65 64 00 00 00 39 80 1c 3c N Limited There is some binary data in there as well, which may or may not be executable code.
However, if it is executable code, there is no distinguishable header or section information; this makes analysis much more difficult. We also don't yet know the CPU architecture or endianess of the target although this could be found with a Google search.
We do, however, have an ELF header located at offset 0x in the firmware image, so let's take a closer look at that: Kernel work queue overflow. Because this image has an ELF header, IDA's auto analysis does a very good job of identifying functions and resolving symbols for us. Let's take a look at the first subroutine, startInflate: So presumably, the decompressImage function decompresses some code to address 0x, which then takes over execution.
Looking further into the decompressImage function, we also see that it calls another function named LzmaDecode: So it appears that the LZMA data that we extracted earlier does contain executable code, and that it is decompressed and loaded into memory at address 0x A Google search for 'vxworks lzmadecode' turns up some source code that confirms this conclusion.
As with the kernel, we'll set the architecture to mipsl, but since this is a binary file we will also have to supply IDA with the proper loading information.Fake news is a type of yellow journalism or propaganda that consists of deliberate disinformation or hoaxes spread via traditional print and broadcast news media or online social media.
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