[BETTER] Download Dumpbin Tool
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I'm sure there's thousands of them out there, but I wanted a dumpbin.exe clone (I was on a machine without Visual Studio), and I couldn't find one (that didn't need link). It turns out writing a reasonable clone is quite a fun walk through the COFF specification, and the NT header files.
Dependency Walker is part of several Microsoft products, such as Visual Studio, Visual C++, Visual Basic, Windows 2000/XP/2003 support tools (on the Windows CD), Windows 98/NT/2000/XP/2003 Resource Kits, Platform SDK, Windows DDK, Windows SDK, and MSDN. There are also several places on the Microsoft web site that it can be downloaded from for free. This site was created in order to distribute the latest version of Dependency Walker for testing.
Dependencies is currently shipped as a binary (no installer present). Just uncompress the archive and click on it.Since the binary is not signed, SmartScreen might scream at runtime. Dependencies also bundle ClrPhTester.exe, a dumpbin-like executable used to test for non-regressions.
Using this command requires that nm (linux) or dumpbin (windows) are available in the PATH. If that is not thecase, you can use the --nm_exe or --dumpbin_exe arguments to pass their location to find_symbols. Forconvenience, you may pass --store_config in addition to --nm_exe or --dumpbin_exe, so that this path will beused in all subsequent calls to find_symbols. The stored configuration can be cleared using --clear_config.
Automatic symbol download works so well that most developers never have to worry about the internal mechanisms. However when things go wrong it can be helpful to understand how they work, and it turns out that it is all very simple.
The precise details of how to get your development tools to use your symbol server vary, but one almost universal method is to set the _NT_SYMBOL_PATH environment variable (advanced usage here and here), to something like this:
If you have a DLL you can find the GUID using dumpbin. That works. Or, you can read the dbghelp help to find out how to get the GUID programmatically. If you figure out how to do it you should share your results.
This article will subvert authentication constraints of a binary by analyzing a disassembled hex code of the target binary. So, the researcher must be familiar with hex coding analysis of an executable and moreover, be aware of various sophisticated tools, such as Dumpbin, IDA pro, PE Editor, Win-Hex, etc., which will be very conducive in disassembling. Finally, a moderate level of understanding about assembly language semantics would be very beneficial during extracting vital information from the target.
The dumpbin.exe utility is a command line tool that allows you to view a number of details for a given unmanaged DLL (or EXE). Like most command line tools, dumpbin.exe supports a set of command line flags you use to inform it exactly what you are interested in viewing. Table 1-1 illustrates some of the more common options.
First, let's check out the set of imported modules used by MyCustomDLL.dll. As you recall, your code base made use of the MessageBox() API (defined in user32.dll), the CoTaskMemAlloc() API (ole32.dll), and the mandatory kernel32.dll. Given this, if you were to open a command window, navigate to the location of MyCustomDLL.dll, and apply the /imports command to dumpbin.exe as follows:
editbin does not explicitly report success. If it completes execution without error, you can assume it worked. You can verify that it actually worked using the dumpbin utility with the /HEADERS switch.
Do not just copy and paste the below procedure! It depends on some supporting code left out here for brevity. Instead download the complete module modLargeAddressAware containing all required code.
Adversaries may transfer tools or other files from an external system into a compromised environment. Tools or files may be copied from an external adversary-controlled system to the victim network through the command and control channel or through alternate protocols such as ftp. Once present, adversaries may also transfer/spread tools between victim devices within a compromised environment (i.e. Lateral Tool Transfer).
On Windows, adversaries may use various utilities to download tools, such as copy, finger, and PowerShell commands such as IEX(New-Object Net.WebClient).downloadString() and Invoke-WebRequest. On Linux and macOS systems, a variety of utilities also exist, such as curl, scp, sftp, tftp, rsync, finger, and wget.[2]
Cobalt Group has used public sites such as github.com and sendspace.com to upload files and then download them to victim computers.[106][1] The group's JavaScript backdoor is also capable of downloading files.[107]
OSX/Shlayer can download payloads, and extract bytes from files. OSX/Shlayer uses the curl -fsL \"$url\" >$tmp_path command to download malicious payloads into a temporary directory.[318][319][320][321]
Network intrusion detection and prevention systems that use network signatures to identify traffic for specific adversary malware or unusual data transfer over known protocols like FTP can be used to mitigate activity at the network level. Signatures are often for unique indicators within protocols and may be based on the specific obfuscation technique used by a particular adversary or tool, and will likely be different across various malware families and versions. Adversaries will likely change tool C2 signatures over time or construct protocols in such a way as to avoid detection by common defensive tools.[475]
nvdisasm is capable of generating control flow of CUDA assembly in the format of DOT graph description language. The output of the control flow from nvdisasm can be directly imported to a DOT graph visualization tool such as Graphviz.
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As you can see in the verbose mode (/v switch) you receive a lot of information about what symchk is doing. We can even read which symbols API it is using (dbghelp messages). The /os switch informs symchk to print full paths of the symbol files in the output messages. After running this command the kernel32.pdb file should be in our symbol store. If you would like to index the whole System32 directory you would like to use the /r switch which informs symchk to recursively step through the provided directory and download symbols for all the files found, eg. symchk /r /v c:\\windows\\system32\\*.dll
With the /ip switch we can provide just process ID and symchk will download symbol files for all the modules loaded in the process. In this example we also used the /s switch which provides symchk with symbol path that it should use (overriding _NT_SYMBOL_PATH if set). In our case we were downloading symbol files from the Microsoft public server to the current directory. The listing of this directory after running this command will look as follows:
Another great functionality of symchk.exe is something called manifest files. Manifest files contain information about all symbols that must be downloaded. You may then run symchk with /om switch which will produce the manifest file without downloading any symbols. Then you can copy the manifest file to any computer that has the Internet connection and download the symbol files using /im switch. The snippet below shows an usage example:
This tool is a wrapper over the DbgHelp.dll library and uncovers almost all of its functionality. We will just look at the one usage example so if you would like to go deeper have a look at the Debugging Tools for Windows help. When you run dbh.exe with a module name as an argument it will automatically download the symbol files. So by simply calling dbh c:\\windows\\system32\\kernel32.dll info you will download the symbol file (_NT_SYMBOL_PATH environment variable is used) and print information about it and its PE file (kernel32.dll):
You might be surprised that this tool appears here, but have you ever noticed its /PDBPATH[:VERBOSE] switch Issuing the dumpbin /pdbpath:verbose on our kernel32.dll library will result in downloading the PDB file from the public symbol store:
This tool is quite interesting as it allows you to check which source files are indexed in the PDB file and eventually extract them. With -r switch you may check which source code paths were hardcoded in the PDB file, eg.
Any tool that you execute that analyzes a binary without running, it performs some kind of static analysis. Basic static analysis consist on producing information about a particular binary without running the code. On Win32 PE files there are a few steps that one can perform in order to find information about the malicious intent of a file in a very short amount of time.
To perform the first step, start by hashing the malicious binary in order to uniquely identify it. Pehash is a small tool that will produce the hashing of the file using different hashing algorithms including CTPH using ssdeep. 153554b96e
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