No doubt many of us will meet the need to read and write the file is in use by another process, for example in the backup program or Trojan time. Taking the SAM files the system, or read some other standard methods cannot successfully access the file is obviously a good thing. For example, when dwShareMode = 0 mark opened the file, no other process can access it on. A good example is the network pager program Miranda. This program when his work does not allow others to open their own . Suppose we want to write such a Trojan, it in the machine after infection a of stolen passwords, and then delete itself, this time we need to solve the problem.

444.exe
samcopy
.......\app
.......\...\hchange.h
.......\...\samcopy.c
.......\...\samcopy.exe
.......\driver
.......\......\driver.c
.......\......\driver.h
.......\......\make.bat
.......\......\makefile
.......\......\reader.sys
.......\......\sources

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