The method names in the library will be the same, such that the application code can be linked with either version and operate correctly. Therefore, the DLL must also be loaded into memory, evening out the gains when it is used by only a single process, but potentially saving a lot of memory space when many applications are sharing the same DLL image.ĭynamic linking can be used to achieve deployment-time configurability, in which there are different versions of the same DLL but with different functionality. The memory image size is larger for processes where the libraries have been statically linked however, a process that uses dynamic linking still needs access to the library code.
The size difference can be significant for large applications and impacts the storage space requirements, the time taken to transmit the file over a network, and also the amount of time required to load the file as the first step in execution. The executable file is larger when static linking is used than with dynamic linking. Richard John Anthony, in Systems Programming, 2016 5.13.2.3 Trade-Offs Between Static and Dynamic Libraries And finally, the sample source and global entropies are compared to a threshold such that if either entropy value is greater than the threshold, the queried specimen is determined to be entropic, and therefore, potentially malicious. The sample source entropy is then determined by calculating an average and standard deviation arrived at by dividing the queried file into overlapping chunks and calculating the entropy associated with each. To determine the entropy of a suspect binary, MRC implements a sliding window method: namely, MRC first calculates the global entropy of the file. Generally, code that is scrambled with a packer or cryptor will exhibit higher entropy. Moreover, unlike traditional packing detection utilities that simply scan a target binary to detect the presence of a known packer or cryptor signature, MRC also focuses on file entropy or the measure of “randomness” in the code.
Agent-gathered information subsequently can be opened in the MRC user interface for analysis. Loading Video.exe into Mandiant Red CurtainĪnother interesting and valuable feature of MRC is that it offers a “roaming” mode, allowing the installation of an Agent on removable media to quickly gather information from other systems without having to install the full MRC application (which requires.NET).
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