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Created: Tuesday, November 16 2010 06:36.28 CST Modified: Tuesday, November 16 2010 06:37.10 CST

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(Yet another) Memory dumper

Author: omeg

# Views: 11171

I wrote a simple process memory dumper recently. Actually, it started as a in-memory string replacer, but I'm only posting the dumper part for now - the rest is in a terrible mess. ;)

The dumper saves all process memory to a single file. It uses NTFS sparse files though, so any non committed memory range does not use physical disk space (sparse zeros). It also checks process handle for access entries limiting VM operations and can print a nice memory map. Nothing fancy, but just what I needed for some work.

It's officially 32-bit only (DWORDs for addresses etc), but seems to somewhat work with 64-bit processes. I'll do a proper 64-bit version later (maybe ;).

Sample output:

c:\code\MemoryDump\Release>MemoryDump.exe explorer.exe v

Searching for target process...

Failed to open process 0x0: 0x57

Failed to open process 0x4: 0x5

[...]

Checking target process' ACL for problematic entries...

Opened \Device\HarddiskVolume3\Windows\explorer.exe as PID 0xb30

Target process suspended, 31 threads

Proceeding with memory dump



Address   Size     Type    State   Protect

   10000:    10000 MAPPED  COMMIT  READ&WRITE

   20000:     2000 MAPPED  COMMIT  READONLY

   22000:     e000 0       FREE    NOACCESS

   30000:     4000 MAPPED  COMMIT  READONLY

   34000:     c000 0       FREE    NOACCESS

   40000:     2000 MAPPED  COMMIT  READONLY

   42000:     e000 0       FREE    NOACCESS

   50000:     1000 PRIVATE COMMIT  READ&WRITE

   51000:     f000 0       FREE    NOACCESS

   60000:    10000 PRIVATE COMMIT  READ&WRITE

   70000:     7000 MAPPED  COMMIT  READONLY

   77000:     9000 0       FREE    NOACCESS

[...]

77610000:     3000 IMAGE   COMMIT  READONLY

77613000:  79cd000 0       FREE    NOACCESS

7efe0000:     5000 MAPPED  COMMIT  READONLY

7efe5000:    fb000 MAPPED  RESERVE 0

7f0e0000:   f00000 PRIVATE RESERVE 0

7ffe0000:     1000 PRIVATE COMMIT  READONLY

7ffe1000:     f000 PRIVATE RESERVE 0



Process resumed. Memory dumped to 2864.mem

Source & binary: http://omeg.pl/code/MemoryDump.zip

Blog Comments

j00ru	Posted: Tuesday, November 16 2010 14:45.04 CST
Thanks for sharing, might come in handy some time ;>

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