By Kris Kaspersky
ISBN-10: 1931769222
ISBN-13: 9781931769228
Going past the problems of examining and optimizing courses in addition to growing the technique of holding info, this consultant takes at the programming challenge of, as soon as having chanced on holes in a software, the right way to pass approximately disassembling it with out its resource code. lined are the hacking tools used to investigate courses utilizing a debugger and disassembler. those tools comprise digital features, neighborhood and international variables, branching, loops, items and their hierarchy, and mathematical operators. additionally coated are tools of struggling with disassemblers, self-modifying code in working platforms, and executing code within the stack. complicated disassembler issues similar to optimizing compilers and movable code are mentioned as well.
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Additional resources for Hacker Disassembling Uncovered: Powerful Techniques To Safeguard Your Programming
Example text
Let's think: Some matches likely result from reading the input via the keyboard and putting characters into the system buffers. This seems plausible. " The memory map will help: Knowing the owner of an area that possesses a buffer, we can say a lot about that buffer. data 0003 0023:00016000 00001E44 IDATA RW Hurrah! One of the matches belongs to our process. The buffer at address 0x16E40 belongs to the data segment and is probably what we need. But we shouldn't be hasty; everything may not be as simple as it seems.
We'll have to repeat the "quit-decrypt-load-analyze" cycle. IDA allows us to solve the same task with less effort and without quitting the disassembler. This can be achieved because of virtual memory. We can imagine IDA is a "transparent" virtual machine, operating on the physical memory of the computer. To modify memory, we need to know the address. This consists of a pair of numbers: a segment address and an offset. On the left side, each line's offset and segment name are given (seg000:0116, for example).
Heap 32 simple Base Id Cmmt/Psnt/Rsvd Segments Flags Process 00140000 01 0003/0003/00FD 1 00000002 simple 00240000 02 0004/0003/000C 00300000 03 0008/0007/0008 1 00008000 simple 1 00001003 simple That's it. We just need to clarify who allocated the memory — the system, or the programmer. The first thing that jumps out is the suspicious and strangely undocumented 0x8000 flag. H, but this won't be helpful unless it shows the system using the flag. #define HEAP_PSEUDO_TAG_FLAG 0x8000 To be convinced, load any application into the debugger and give the command heap 32 proc_name.
Hacker Disassembling Uncovered: Powerful Techniques To Safeguard Your Programming by Kris Kaspersky
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