6:11 p.m.
Hi Kathy,
One quick thing about impscan is the --base option should be passed the
base address of the memory range to scan. Neither the ?10 address or nor
the ?12 address is truly a "base" address, so that's why it fails on those.
The bases according to your output are 0x1f00000 (which you did and got 3
results: HeapFree, GetProcessHeap, and HeapAlloc) and 0x01f50000. Thus try
using impscan --base=0x01f50000 if you haven't already. The fact that the
MZ header at 0x01f50012 isn't at the base of the memory region (0x01f50000)
is quite suspect. If loaded through a normal API function like
CreateProcess, LoadLibrary, etc then the MZ will always be at the base. You
can also use vaddump --base=0x01f50000 to dump out the memory segment, then
use a hex editor to remove the first 0x12 bytes, and load the resulting
file into something like LordPE, CFF Explorer, PE explorer, etc to see what
you can gather about its imports. Those are just a few things to get you
started.
MHL
On Fri, Jan 17, 2014 at 11:54 AM, Kathy Simmons <kathys82911(a)gmail.com>wrote:
I have a memory dump of a Windows XP box with a piece
of malware running
in it. In the course of running malfind on the image, there are eight
responses, two of which are below (A and B).
After the malfind command, I run the impscan command to look at the
imports:
python vol.py impscan -p 820 -b 0x1f00000
python vol.py impscan -p 820 -b 0x01f50010
The response to the first impscan command is what I expected (see C
below). The response to the second impscan command (see D below) is not
what I expected at all - no imports?
I also ran impscan on the address 0x01f50012 based on the results from the
malfind command (see D below) as I figured that I wanted to dump the dll
starting on the beginning of the MZ header. But neither address produced
any imports - I'm not sure where to go from here.
I'm very new at this; any help would be greatly appreciated. My end goal
is to take this piece of malware, which looks to have injected several
dll's into a process, dump out each dll, then have them reverse engineered.
Thanks-
A.
Process: xxxxxx.exe Pid: 820 Address: 0x1f00000
Vad Tag: VadS Protection: PAGE_EXECUTE_READWRITE
Flags: CommitCharge: 9, PrivateMemory: 1, Protection: 6
0x01f00000 4d 5a 90 00 03 00 00 00 04 00 00 00 ff ff 00 00
MZ..............
0x01f00010 b8 00 00 00 00 00 00 00 40 00 00 00 00 00 00 00
........@.......
0x01f00020 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
................
0x01f00030 00 00 00 00 00 00 00 00 00 00 00 00 c8 00 00 00
................
0x1f00000 4d DEC EBP
0x1f00001 5a POP EDX
0x1f00002 90 NOP
0x1f00003 0003 ADD [EBX], AL
0x1f00005 0000 ADD [EAX], AL
0x1f00007 000400 ADD [EAX+EAX], AL
0x1f0000a 0000 ADD [EAX], AL
0x1f0000c ff DB 0xff
0x1f0000d ff00 INC DWORD [EAX]
0x1f0000f 00b800000000 ADD [EAX+0x0], BH
0x1f00015 0000 ADD [EAX], AL
0x1f00017 004000 ADD [EAX+0x0], AL
0x1f0001a 0000 ADD [EAX], AL
0x1f0001c 0000 ADD [EAX], AL
0x1f0001e 0000 ADD [EAX], AL
0x1f00020 0000 ADD [EAX], AL
0x1f00022 0000 ADD [EAX], AL
0x1f00024 0000 ADD [EAX], AL
0x1f00026 0000 ADD [EAX], AL
0x1f00028 0000 ADD [EAX], AL
0x1f0002a 0000 ADD [EAX], AL
0x1f0002c 0000 ADD [EAX], AL
0x1f0002e 0000 ADD [EAX], AL
0x1f00030 0000 ADD [EAX], AL
0x1f00032 0000 ADD [EAX], AL
0x1f00034 0000 ADD [EAX], AL
0x1f00036 0000 ADD [EAX], AL
0x1f00038 0000 ADD [EAX], AL
0x1f0003a 0000 ADD [EAX], AL
0x1f0003c c8000000 ENTER 0x0, 0x0
B.
Process: XXXXXX.exe Pid: 820 Address: 0x1f50000
Vad Tag: VadS Protection: PAGE_EXECUTE_READWRITE
Flags: CommitCharge: 59, MemCommit: 1, PrivateMemory: 1, Protection: 6
0x01f50000 4c 1b cd 25 00 00 09 e8 16 4f 9e 7e cd 25 00 00
L..%.....O.~.%..
0x01f50010 00 00 4d 5a 90 00 03 00 00 00 04 00 00 00 ff ff
..MZ............
0x01f50020 00 00 b8 00 00 00 00 00 00 00 40 00 00 00 00 00
..........@.....
0x01f50030 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
................
0x1f50000 4c DEC ESP
0x1f50001 1bcd SBB ECX, EBP
0x1f50003 25000009e8 AND EAX, 0xe8090000
0x1f50008 16 PUSH SS
0x1f50009 4f DEC EDI
0x1f5000a 9e SAHF
0x1f5000b 7ecd JLE 0x1f4ffda
0x1f5000d 2500000000 AND EAX, 0x0
*0x1f50012 4d DEC EBP0x1f50013 5a POP EDX*
0x1f50014 90 NOP
0x1f50015 0003 ADD [EBX], AL
0x1f50017 0000 ADD [EAX], AL
0x1f50019 000400 ADD [EAX+EAX], AL
0x1f5001c 0000 ADD [EAX], AL
0x1f5001e ff DB 0xff
0x1f5001f ff00 INC DWORD [EAX]
0x1f50021 00b800000000 ADD [EAX+0x0], BH
0x1f50027 0000 ADD [EAX], AL
0x1f50029 004000 ADD [EAX+0x0], AL
0x1f5002c 0000 ADD [EAX], AL
.................
................
C.
python vol.py impscan -p 9820 -b 0x01f00000
Volatility Foundation Volatility Framework 2.3.1
IAT Call Module Function
------------------ ------------------ -------------------- --------
0x0000000001f07d10 0x0000000076cf2c70 kernel32.dll HeapFree
0x0000000001f07d18 0x0000000076cf2d60 kernel32.dll GetProcessHeap
0x0000000001f07d20 0x0000000076e41b70 kernel32.dll HeapAlloc
D.
python vol.py impscan -p 820 -b 0x01f50010
Volatility Foundation Volatility Framework 2.3.1
IAT Call Module Function
------------------ ------------------ -------------------- --------
E.
python vol.py impscan -p 820 -b 0x01f50012
Volatility Foundation Volatility Framework 2.3.1
IAT Call Module Function
------------------ ------------------ -------------------- --------
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