![]() Pahk and Agard, for publicizing a terrifically entertaining and underrated league.ĥ9A: LeVar Burton is a trip, people. The Connecticut Sun, singular, are coincidentally making a good run for the WNBA championship right now, so well done, Messrs. “Sun bloc?” made zero sense, even when filled in on crosses - WNBA - before I resorted to Google (took one for the bloc, I guess - I Google so you don’t have to). Right beneath this was a little wild one. You absolutely could have been forgiven for playing James Harden here, but he’s a guard. I know that lots of sports have a “forward” position, but forwards in hoops tend to be famous, like this guy, LEBRON. The question mark denoted a pun, and “James who is more than a little forward?” indicated basketball. STEPINS makes sense, but it seems kind of obscure (and has also been clued as “quaint undies” in the past).Ĥ6A: There were two really good basketball puns right here. ![]() Today’s included RIPER (I had “rarer”), which happened to cross STEPINS (which could be SLIPONS). Breaking up the trampoline in this way allows us to have multiple function rerouting routines installed in the targeted binary.Saturday constructors seem to keep a list of very wily misdirects in their back pockets. The trampoline is made up of two parts: a hook-specific set of instructions that save the processor state and identify the hooked function, and a generic handler that calls Hades¡¯ hooked system call. The trampoline code is installed at offset 0x800 within the SharedUserData area (at address 0x7FFE000 from user space) to place it past Windows function pointers (which are the intended use of this area). Hades uses this area as a scratch space and to host its code for transitioning to the kernel from user space. The trampoline is installed in the SharedUserData memory area, which Windows uses as an efficient way to provide processes with certain frequently requested information. Transitioning from user space to kernel space is achieved by trampolining through the system call dispatcher, which has memory accessible to both kernel and user code. The driver will save the context (registers, stack, etc.) and display it, change any registers specified by the user, execute the original function bytes, and return control to the process at a point just after the rerouted instruction (virtual address + ). Once the instruction pointer hits our rerouting hook control is passed to the trampoline, which invokes an interrupt that will send execution to our hooked system call, where the Hades driver takes control. Finally, an instruction rerouting hook (a JMP to the trampoline code) is installed in the process at a user-specified virtual address and target execution is resumed. Then a trampoline to a shared area of memory is created. ![]() First, a system call is hooked (any will do). When the target is loaded, but before it begins executing, Hades sets up a system call hook that will allow control to pass from the target to the Hades driver. The Hades driver registers a callback function using PsSetLoadImageNotifyRoutine to detect when the target executable is loaded. First, a target executable is identified for instrumentation. Hades is based on the concept of instruction rerouting. To avoid detection, we created an instrumentation tool based on instruction rerouting (to avoid most debugger detection techniques) that runs from the kernel rather than using DLL injection (which avoids DLL detection) The malware we were examining could detect that unauthorized DLLs were being loaded into the current process space. Both of these tools work by injecting a DLL into a target binary the DLL places hooks in specific sets of functions and logs information when those functions are called. We developed it to help us analyze some malware binaries that were able to detect Detours and WAO. It has function hooking capabilities similar to Microsoft Detours and WinAPIOverride (WAO), and it can also function as a debugger. ![]() Hades is a tool for dynamic application analysis. We wrote Hades to make that job a little easier. Reverse engineers frequently need to analyze protected code, whether they're evaluating the latest protection system or trying to figure out what a new piece of malware does. It works through binary instrumentation, but it's much more lightweight that frameworks like Pin. Hades is a Windows kernel driver that lets reverse engineers monitor and affect the execution of both user and kernel mode code.
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