Introducing LiveDump.exe

As mentioned in my previous blog post this afternoon, it appears Microsoft has added back the ability to dump physical memory to disk (in the form of a dump file) from user mode via NtSystemDebugControl.  I wrote a quick proof-of-concept tool and generated what appears to be a 250mb kernel bitmap dump:


Loading Dump File [C:\XXXXXX\dump.dmp]
Kernel Bitmap Dump File: Only kernel address space is available
...
Windows 8 Kernel Version 9600 UP Free x86 compatible
Product: WinNt, suite: TerminalServer SingleUserTS
Built by: 9600.16404.x86fre.winblue_gdr.130913-2141
Machine Name:
Kernel base = 0x81062000 PsLoadedModuleList = 0x8125b218
Debug session time: Fri Aug 1 18:40:22.806 2014 (UTC - 4:00)
System Uptime: 0 days 1:50:55.292
Loading Kernel Symbols
...
..
STACK_TEXT:
a489fa88 8129c557 842fa2b0 00000000 868d7e60 nt!MmDuplicateMemory+0x67a
a489fab0 8148d3b2 b4e31030 00000000 a489fb34 nt!IopLiveDumpCaptureMemoryPages+0x39
a489facc 811cb332 00000000 00000000 00000000 nt!IoCaptureLiveDump+0xc9
a489fb1c 814e9324 eb98f881 00000025 00c4fc74 nt!DbgkCaptureLiveKernelDump+0x2f4
a489fbf4 811736f7 00000025 00c4fd60 00000028 nt!NtSystemDebugControl+0x691
a489fbf4 7794f804 00000025 00c4fd60 00000028 nt!KiSystemServicePostCall
WARNING: Frame IP not in any known module. Following frames may be wrong.
00c4fdc0 00000000 00000000 00000000 00000000 0x7794f804

When I ran the tool (as an administrator), I saw this in the attached kernel debugger:

livedump
WER/CrashAPI:1959: ERROR ReadProcessMemory failed while trying to read PebBaseAddress
WER/CrashAPI:2068: ERROR Failed to read the peb from the process

 

Hmm, what is “CrashAPI”? Clearly there’s more going on here. Stay tuned!

Greetz to Alex, as usual, for helping me turn numbers into strings and correctly calculating powers of 2.

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Posted in blog, conference, source code
3 comments on “Introducing LiveDump.exe
  1. test says:

    SeDebugPrivilege needed?

  2. […] wrap up the recent news concerning live dumps, which I discussed here and here, I will cover the topic in a bit more detail and provide full source code to a tool you […]

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