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This leads to extensive changes in the system and tools being needed to conceal a single change.Because object code can be regenerated by recompiling (reassembling, relinking) the original source code, making a persistent object code backdoor (without modifying source code) requires subverting the compiler itself – so that when it detects that it is compiling the program under attack it inserts the backdoor – or alternatively the assembler, linker, or loader.Further, object code backdoors can be removed (assuming source code is available) by simply recompiling from source.Thus for such backdoors to avoid detection, all extant copies of a binary must be subverted, and any validation checksums must also be compromised, and source must be unavailable, to prevent recompilation.These backdoors can be inserted either directly in the on-disk object code, or inserted at some point during compilation, assembly linking, or loading – in the latter case the backdoor never appears on disk, only in memory.Object code backdoors are difficult to detect by inspection of the object code, but are easily detected by simply checking for changes (differences), notably in length or in checksum, and in some cases can be detected or analyzed by disassembling the object code.Even direct admissions of responsibility must be scrutinized carefully if the confessing party is beholden to other powerful interests.Many computer worms, such as Sobig and Mydoom, install a backdoor on the affected computer (generally a PC on broadband running Microsoft Windows and Microsoft Outlook).

The chip was unsuccessful internationally and in business.The Samsung proprietary Android versions are fitted with a backdoor that provides remote access to the data stored on the device.In particular, the Samsung Android software that is in charge of handling the communications with the modem, using the Samsung IPC protocol, implements a class of requests known as remote file server (RFS) commands, that allows the backdoor operator to perform via modem remote I/O operations on the device hard disk or other storage.Alternatively, these other tools (length checks, diff, checksumming, disassemblers) can themselves be compromised to conceal the backdoor, for example detecting that the subverted binary is being checksummed and returning the expected value, not the actual value.To conceal these further subversions, the tools must also conceal the changes in themselves – for example, a subverted checksummer must also detect if it is checksumming itself (or other subverted tools) and return false values.

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