Borland's
C++ builder v4
Emulating inputs on a timebomb protection
Emulating inputs on a timebomb protection
by Tsehp
by tsehp+
Emulating inputs on a timebomb protection |
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by Tsehp | ||
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by tsehp+ | |
After I received macillaci's essay, I wanted to try the luck on borland c++, well no surprise, the protection is all the same. I actually work on windows 2000 and wisdec doesn't work on this system, so we have to use our brains to find another path.
More and more tools like wisdec and procdump are discontinuited at this time. Hope we still see such great and useful tools in the future.
Any Hexeditor
Softice 4.01
IDA 4.01
IsDCC (installshield decompiler, still working on
win2k)
1) Installshield crack First you've got to install this and provide a password that borland can give you if you provide your email. We are not here to talk about anonymisers so lets crack this script, located as always inside setup.ins.
We learned on this site to crack those scripts with hexeditors (see installshield cracking section), I can't use wisdec on my system it's not working and this tool is stopped since 98, so forget it. Setup.ins contains tokens, interpreted as instructions by the running proc _ins5116.exe, with tests, jumps all of this is explained in the essays related to that.
On the decompiled script, you find this :
label941:
lNumber1 = 0;
lString0 = "Taj";
lString2 = SUPPORTDIR ^ "cleanup.dll";
UseDLL(lString2);
lNumber2 = LAST_RESULT;
CLEANUP.StartLogFile(lString1);
lNumber3 = LAST_RESULT;
UnUseDLL("cleanup.dll");
StrLoadString("", "TRIAL_TEXT", lString3); *Loads the trial passwd entry nag.
AskText(lString3, "", lString0); * password entered in string0
lNumber4 = LAST_RESULT;
StrCompare(lString1, lString0); *password check
lNumber5 = LAST_RESULT != 0; *this test fails last_result is different than 0.
if (lNumber5 = 0) then *If test ok, this jumps to GOOD BOY, lets patch this one (1)
goto label945;
endif;
lNumber5 = lNumber1 >= 3; *more than three attempts ?
if (lNumber5 = 0) then
goto label944; *jump to bad guy exit
endif;
abort;
label943: *bad guy messageboxa if the test fails
MessageBeep(0);
StrLoadString("", "WRONG_PSWD", lString3);
MessageBox(lString3, -65535);
lNumber1 = lNumber1 + 1;
StrLoadString("", "TRIAL_TEXT", lString3);
AskText(lString3, "", lString0);
lNumber4 = LAST_RESULT;
goto label943;
(1) Ok we've got to invert the test, it would be easy with wisdec but we will not use it. Search for TRIAL_TEXT with your hexeditor inside setup.ins, you find this :
00012040 0054 5249 414C 5F54 4558 5452 98FF 1E00 .TRIAL_TEXTR....
00012050 6298 FF61 0000 529B FF21 0032 97FF 4200 b..a..R..!.2..B.
00012060 0000 0007 0029 0123 0062 9AFF 629B FF28 .....).#.b..b..(
00012070 0132 96FF 4200 0041 0600 0000 4100 0000 .2..B..A....A...
00012080 0022 0070 B103 9542 96FF 4100 0000 0028 .".p...B..A....(
00012090 0132 96FF 429A FF41 0400 0000 4103 0000 .2..B..A....A...
000120A0 0022 0070 B003 9542 96FF 4100 0000 0059 .".p...B..A....Y
000120B0 0100 0008 003A 0041 0000 0000 1201 6100 .....:.A......a.
000120C0 0061 0A00 5752 4F4E 475F 5053 5744 5298 .a..WRONG_PSWDR.
Well, you see the ascii occurences, if you learned well from the installshield essays, you know that the conditionnal jump is like this 03 95 label0 ff label1 where 95 is jump if result = 0 (96 if different than 0) Labels are two bytes like 42 96, they're at the beginning of primary instructions inside setup.ins.
We invert the jump at offset 12087, 03 95 42 96 -> 03 96 42 96
There are crc checks inside setup.ins, all the bytes are added to form it, we have to reduce a byte to make the crc work. We better do that inside a ascii text, found one at offset 58c6 :
000058C0 6119 0055 6E61 626C 6520 746F 2063 7265 a..Unable to crelets reduce the b from "unable" to a-> 000058C0 6119 0055 6E61 616C 6520 746F 2063 7265 a..Unaale to cre
So the crc check will be ok.Launch it, enter nothing at the password nag and the trial installs itself !
2) Time trial protection (copied from macilaci's essay, those parts are the same, except for the adresses) Note from tsehp : with ida, you don't need to dump the progs, even when it's crypted and pe are bad, this tool is able to disassemble thoses place. Buy it !
/***
After I saw what's going on I decided to emulate inputs. The delete approach is effective but not elegant. Stop, I found timefix.exe. Sweet - references to HKLM\SOFTWARE\Ntpad\HELPMENU\tin and some more... Try now run the trial with Boundschecker. Sysprst,.... GetLocalTime!! 0x00d217d =0x004d217d
Let's see:
_0000010:004D6900 sub esp, 0CCh _0000010:004D6906 lea eax, [esp+0CCh+var_BC] _0000010:004D690A push esi _0000010:004D690B push eax _0000010:004D690C call ds:GetLocalTime _0000010:004D6912 lea ecx, [esp+0D0h+var_CC] _0000010:004D6916 push ecx _0000010:004D6917 call ds:GetSystemTime _0000010:004D691D mov cx, ds:word_0_496D02 _0000010:004D6924 cmp [esp+0D0h+var_C2], cx _0000010:004D6929 jnz short loc_0_4D6967 _0000010:004D692B mov ax, ds:word_0_496D00 _0000010:004D6931 cmp [esp+0D0h+var_C4], ax _0000010:004D6936 jnz short loc_0_4D6967 _0000010:004D6938 mov ax, ds:word_0_496CFE _0000010:004D693E cmp [esp+0D0h+var_C6], ax _0000010:004D6943 jnz short loc_0_4D6967 _0000010:004D6945 mov ax, ds:word_0_496CFA _0000010:004D694B cmp [esp+0D0h+var_CA], ax _0000010:004D6950 jnz short loc_0_4D6967 _0000010:004D6952 mov ax, ds:word_0_496CF8 _0000010:004D6958 cmp [esp+0D0h+var_CC], ax _0000010:004D695D jnz short loc_0_4D6967 _0000010:004D695F mov edx, ds:dword_0_496CF0 _0000010:004D6965 jmp short loc_0_4D69AD .../... _0000010:004D69AD mov eax, [esp+0D0h+var_B0] _0000010:004D69B1 push edx _0000010:004D69B2 and eax, 0FFFFh _0000010:004D69B7 push eax _0000010:004D69B8 xor eax, eax _0000010:004D69BA mov ax, [esp+0D8h+var_B2] _0000010:004D69BF push eax _0000010:004D69C0 mov eax, [esp+28h] _0000010:004D69C4 and eax, 0FFFFh _0000010:004D69C9 push eax _0000010:004D69CA xor eax, eax _0000010:004D69CC mov ax, [esp+0E0h+var_B6] _0000010:004D69D1 push eax _0000010:004D69D2 xor eax, eax _0000010:004D69D4 mov ax, word ptr [esp+0E4h+var_BC+2] _0000010:004D69D9 push eax _0000010:004D69DA mov eax, [esp+0E8h+var_BC] _0000010:004D69DE and eax, 0FFFFh _0000010:004D69E3 push eax _0000010:004D69E4 call sub_0_4DBCE0 ; this returns some strange value in eax and edx _0000010:004D69E9 mov ecx, [esp+0ECh+arg_0] _0000010:004D69F0 add esp, 1Ch _0000010:004D69F3 test ecx, ecx _0000010:004D69F5 jz short loc_0_4D69F9 _0000010:004D69F7 mov [ecx], eax _0000010:004D69F9 _0000010:004D69F9 loc_0_4D69F9: ; CODE XREF: sub_0_4D6900+F5j _0000010:004D69F9 pop esi _0000010:004D69FA add esp, 0CCh _0000010:004D6A00 retn Another encryption? Probably yes. Let's see the above routine sub_0_4D69f9:
_0000010:004DBD63 dec ebx _0000010:004DBD64 lea esi, [edx+edx*2] _0000010:004DBD67 mov [esp+34h+var_14], ebx _0000010:004DBD6B mov [esp+34h+var_1C], ecx _0000010:004DBD6F lea edx, [esi+esi*4] _0000010:004DBD72 add edx, [esp+34h+arg_14] ;the final edx value _0000010:004DBD76 lea esi, [edx+eax+7C558180h] ;the final eax=esi value _0000010:004DBD7D mov eax, [esp+34h+arg_18] _0000010:004DBD81 cmp eax, 1 _0000010:004DBD84 jz short loc_0_4DBDA5 _0000010:004DBD86 cmp eax, 0FFFFFFFFh _0000010:004DBD89 jnz short loc_0_4DBDAB _0000010:004DBD8B cmp ds:dword_0_4905E4, 0 _0000010:004DBD92 jz short loc_0_4DBDAB _0000010:004DBD94 lea eax, [esp+34h+var_24] _0000010:004DBD98 push eax _0000010:004DBD99 call sub_0_4DE680 _0000010:004DBD9E add esp, 4 _0000010:004DBDA1 test eax, eax _0000010:004DBDA3 jz short loc_0_4DBDAB
Write down the edx and eax and replace the location 004D747F:
_0000010:004DBD76 mov esi, 38820632h _0000010:004DBD7B mov edx, 0BC2C84B2h _0000010:004DBD80 nop Note from tsehp : Be sure that further installs at this point will be the same day, otherwise the later date tamper subroutine will detect that and make the prog expire.
With a search and replace util, look for the occurences of 4dbd76 : 8D B4 02 80 81 55 7C 8B 44 24 50 You will find the protection in all those files that you must patch:
16/01/2000 18:28:58 Search String: \0x8d\0xb4\0x02\0x80\0x81\0x55\0x7c\0x8b\0x44\0x24\0x50 Replace String: Path: C:\Program Files\Borland\CBuilder4 File Mask: *.* Search Subdirectories, Search ZIP Files Processing file : C:\Program Files\Borland\CBuilder4\Bin\bcb.exe Offset 0xcc776 - ´ U| D$P Found 1 occurrences. Processing file : C:\Program Files\Borland\CBuilder4\Bin\bcbcxp40.bpl Offset 0x108976 - ´ U| D$P Found 1 occurrences. Processing file : C:\Program Files\Borland\CBuilder4\Bin\bcbidl40.bpl Offset 0xb9176 - ´ U| D$P Found 1 occurrences. Processing file : C:\Program Files\Borland\CBuilder4\Bin\dbexplor.exe Offset 0x55776 - ´ U| D$P Found 1 occurrences. Processing file : C:\Program Files\Borland\CBuilder4\Bin\dcldss40.bpl Offset 0x64576 - ´ U| D$P Found 1 occurrences. Processing file : C:\Program Files\Borland\CBuilder4\Bin\dclmid40.bpl Offset 0x61576 - ´ U| D$P Found 1 occurrences. Processing file : C:\Program Files\Borland\CBuilder4\Bin\dclnet40.bpl Offset 0x66d76 - ´ U| D$P Found 1 occurrences. Processing file : C:\Program Files\Borland\CBuilder4\Bin\ilink32.exe Offset 0x93776 - ´ U| D$P Found 1 occurrences. Searched 2017 file(s), found 8 occurrences in 8 file(s)
Good idea to locate it in all those places, but it would have been better to change it a little no ? ;-)
3)run without activator
Back to our bounschecker record. Now look at this when the activator is running.
Api reference: WaitForSingleObject and before CreateProcessA in caitf32.dll
module:
00401307
push 0
00401309
call
j_CreateProcessA ;here start activator
0040130E
test eax, eax
00401310
jz loc_0_4013C0
00401316
test ebx, ebx
00401318
jz loc_0_4013A9
0040131E
push 0FFFFFFFFh
00401320
mov ecx, [ebp-14h]
00401323
push ecx
00401324
call j_WaitForInputIdle
00401329
mov [ebp-4], eax
0040132C
cmp dword ptr [ebp-4], 0
00401330
jnz short loc_0_4013A0
00401332
push 64h
00401334
mov eax, [ebp-14h]
00401337
push eax
00401338
call j_WaitForSingleObject
...
0040138B
push edx
0040138C
mov ecx, [ebp-14h]
0040138F
push ecx
00401390
call j_GetExitCodeProcess ;and get the result
00401395
jmp short loc_0_4013AE
This subroutine is called from this sub:
004018CC
push 1
004018CE
mov edx, [ebp+arg_0]
004018D1
push edx
004018D2
call
sub_0_401288 ; call the
activator routine
004018D7
add esp, 14h
004018DA
mov ebx, eax
Each time we press TRY button in the eax is returned the 0x00002716 value. Other
registers
doesn't affect the program run. Simple replace:
004018D2
mov eax, 0x00002716 ;now we can run it
without activator
And the patch is done. Our trial is running any time we want.
No time stamp protection on this one.
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