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Auto Assembler

 
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scearezt
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PostPosted: Mon Apr 11, 2011 7:42 am    Post subject: Auto Assembler Reply with quote
Hey guys, I've a question about the Auto Assembler.

Is it possible to call a script without writing it into an address?

I mean, I've a code which runs when the address being called:
Code:
[ENABLE]
alloc(newmem,2048)
label(returnhere)
label(originalcode)
label(exit)
label(org)

"cm.exe"+102FC1:
jmp newmem
nop
nop
nop
nop
nop
returnhere:

newmem:
cmp [0075F40C],edx
JNE org
jmp exit

org:
inc [0075F40C]

originalcode:
mov [0075F40C],edx

exit:
jmp returnhere

"cm.exe"+102FC1:
jmp newmem
nop
nop
nop
nop
nop

[DISABLE]
dealloc(newmem)
"cm.exe"+102FC1:
mov [0075F40C],00000001


But I want to call this address myself. How can I do it?
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Geri
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PostPosted: Mon Apr 11, 2011 10:02 am    Post subject: Reply with quote
You can't just call any code of the program when you wish without causing tons of errors (and probably immediate crash).

If you wish to change a value, that is another matter of course.

You can make a script to increase a stored address anytime, or just store the address, add it into the CE table and assign a key to it to change it anytime.
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scearezt
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PostPosted: Mon Apr 11, 2011 10:50 am    Post subject: Reply with quote
It's not just a value, I want to run a whole script.
The script contains a "loop", which increasing a value until it reaches the final value which was a dynamic value. Or it can be a simple value change, but then how can I do that?:

Code:
mov [0075F40C],edx
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Geri
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PostPosted: Mon Apr 11, 2011 11:13 am    Post subject: Reply with quote
If it is a loop, you should jump back from org to newmem to check, increase, check, increase... and exit at the end.
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scearezt
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PostPosted: Mon Apr 11, 2011 11:15 am    Post subject: Reply with quote
Yes I know but this script runs only when it's called by an another address... How can I call myself to loop it?
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Geri
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PostPosted: Mon Apr 11, 2011 11:50 am    Post subject: Reply with quote
You can't just call any address anytime. The functions are built on each other. It is like if you would ask "how can I always take one step forward"? You can do that anytime, but depending on where you are, you can easily go into a wall, fall off from a cliff, get hit by a car at the middle of a road or whatever.

To avoid these accidents, you also need to change the whole environment. Some simple functions can be called anytime but calling a function randomly from an application is a sure way to crash the whole program as the environtment will not be the same as it should be when the function is executed. Taking a deep breath in space will not help in surviving, no matter how badly you want it.
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scearezt
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PostPosted: Sun Apr 17, 2011 6:55 am    Post subject: Reply with quote
I've a new question...

Is it possible to compare an address' value to 2 value at once?

I've this code so far...

Code:
[ENABLE]
alloc(newmem,2048)
label(returnhere)
label(originalcode)
label(exit)
label(comp1)
label(comp2)

newmem:
cmp [0150FECC],19
jl comp1
cmp [0150FECC],1C
je comp2
jmp originalcode

comp1:
mov [0150FECC],19
jmp newmem

comp2:
mov [0150FECC],2D
jmp newmem

originalcode:
cmp dword ptr [0150FECC],27

exit:
jmp returnhere

"ga.exe"+489B2:
jmp newmem
nop
nop
returnhere:

Just a simple value comparing. If I'm not wrong, "je comp2" this means jumpIfEqual, is it possible to say: "jump if lower and bigger than"

Is it?

Thanks!
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Geri
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PostPosted: Sun Apr 17, 2011 4:58 pm    Post subject: Reply with quote
You will need to make 2 compares and plan your instructions according to each results, or make some kind of loop and use a changing value for the same compare. Just for reference, here are the conditional jumps that you can use (a bit old reference but still quite useful).


Code:
Jxx - Jump Instructions Table
        Mnemonic              Meaning                    Jump Condition
          JA     Jump if Above                         CF=0 and ZF=0
          JAE    Jump if Above or Equal                CF=0
          JB     Jump if Below                         CF=1
          JBE    Jump if Below or Equal                CF=1 or ZF=1
          JC     Jump if Carry                         CF=1

          JCXZ   Jump if CX Zero                       CX=0
          JE     Jump if Equal                         ZF=1
          JG     Jump if Greater (signed)              ZF=0 and SF=OF
          JGE    Jump if Greater or Equal (signed)     SF=OF
          JL     Jump if Less (signed)                 SF != OF
          JLE    Jump if Less or Equal (signed)        ZF=1 or SF != OF
          JMP    Unconditional Jump                    unconditional

          JNA    Jump if Not Above                     CF=1 or ZF=1
          JNAE   Jump if Not Above or Equal            CF=1
          JNB    Jump if Not Below                     CF=0
          JNBE   Jump if Not Below or Equal            CF=0 and ZF=0
          JNC    Jump if Not Carry                     CF=0
          JNE    Jump if Not Equal                     ZF=0
          JNG    Jump if Not Greater (signed)          ZF=1 or SF != OF

          JNGE   Jump if Not Greater or Equal (signed) SF != OF
          JNL    Jump if Not Less (signed)             SF=OF
          JNLE   Jump if Not Less or Equal (signed)    ZF=0 and SF=OF
          JNO    Jump if Not Overflow (signed)         OF=0
          JNP    Jump if No Parity                     PF=0
          JNS    Jump if Not Signed (signed)           SF=0
          JNZ    Jump if Not Zero                      ZF=0

          JO     Jump if Overflow (signed)             OF=1
          JP     Jump if Parity                        PF=1
          JPE    Jump if Parity Even                   PF=1
          JPO    Jump if Parity Odd                    PF=0
          JS     Jump if Signed (signed)               SF=1
          JZ     Jump if Zero                          ZF=1

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scearezt
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PostPosted: Mon Apr 18, 2011 5:57 am    Post subject: Reply with quote
Thanks Geri, I've saved this table.

Aaaand here's what I've made:
Code:

alloc(newmem,2048)
label(returnhere)
label(originalcode)
label(exit)
label(jmp1)
label(jmp2)
label(jmp3)
label(jmp4)
label(jmp5)
label(jmp6)
label(jmp7)
label(jmp8)
label(jmp9)
label(jmp10)
label(jmp11)
label(jmp12)
label(jmp13)
label(jmp14)
label(jmp15)
label(jmp16)
label(jmp17)
label(jmp18)
label(jmp19)
label(jmp20)
label(jmp21)

newmem:
cmp [0150FECC],1
je jmp1
cmp [0150FECC],18
je jmp2
cmp [0150FECC],1C //28
je jmp3
cmp [0150FECC],2C //44
je jmp4
cmp [0150FECC],2F //47
je jmp5
cmp [0150FECC],31 //49
je jmp6
cmp [0150FECC],3F //63
je jmp7
cmp [0150FECC],40 //64
je jmp8
cmp [0150FECC],42 //66
je jmp9
cmp [0150FECC],45 //69
je jmp10
cmp [0150FECC],6C //108
je jmp11
cmp [0150FECC],6D //109
je jmp12
cmp [0150FECC],73 //115
je jmp13
cmp [0150FECC],77 //119
je jmp14
cmp [0150FECC],7C //124
je jmp15
cmp [0150FECC],0F7 //247
je jmp16
cmp [0150FECC],105 //261
je jmp17
cmp [0150FECC],10D //269
je jmp18
cmp [0150FECC],11F //287
je jmp19
cmp [0150FECC],15D //349
je jmp20
cmp [0150FECC],165 //357
je jmp21
jmp originalcode

jmp1:
mov [0150FECC],19 //25
jmp newmem

jmp2:
mov [0150FECC],19 //25
jmp newmem

jmp3:
mov [0150FECC],2D //45
jmp newmem

jmp4:
mov [0150FECC],1B //27
jmp newmem

jmp5:
mov [0150FECC],32 //50
jmp newmem

jmp6:
mov [0150FECC],2E //46
jmp newmem

jmp7:
mov [0150FECC],41 //65
jmp newmem

jmp8:
mov [0150FECC],3E //62
jmp newmem

jmp9:
mov [0150FECC],46 //70
jmp newmem

jmp10:
mov [0150FECC],41 //65
jmp newmem

jmp11:
mov [0150FECC],6E //110
jmp newmem

jmp12:
mov [0150FECC],6B //107
jmp newmem

jmp13:
mov [0150FECC],78 //120
jmp newmem

jmp14:
mov [0150FECC],72 //114
jmp newmem

jmp15:
mov [0150FECC],0F8 //248 --- Don't begin Hexadecimal numbers with letters!
jmp newmem

jmp16:
mov [0150FECC],7B //123
jmp newmem

jmp17:
mov [0150FECC],10E //270
jmp newmem

jmp18:
mov [0150FECC],104 //260
jmp newmem

jmp19:
mov [0150FECC],15E //350
jmp newmem

jmp20:
mov [0150FECC],11E //286
jmp newmem

jmp21:
mov [0150FECC],165 //357
jmp newmem

originalcode:
cmp dword ptr [0150FECC],27

exit:
jmp returnhere

"ga.exe"+489B2:
jmp newmem
nop
nop
returnhere:


Just skipping some values when a key pressed and the value is a "specific" value.
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Geri
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PostPosted: Mon Apr 18, 2011 6:27 am    Post subject: Reply with quote
Well I am not sure what is the purpose of this code but I noticed that jmp1 and jmp2 is doing the same so it would be enough to jump to jmp1 in both cases.

Quote:
Don't begin Hexadecimal numbers with letters!


It doesn't matter in CE. Your script will be compiled correctly anyway.
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scearezt
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PostPosted: Sun Apr 24, 2011 8:50 am    Post subject: Debugger Reply with quote
Hey guys, I just don't want to open a new topic so... here's an another question.

What's breakpoints good for?
I'm disappointed in it 'Cuz I don't know what's the point of it...
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Geri
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PostPosted: Sun Apr 24, 2011 12:00 pm    Post subject: Reply with quote
Set a breakpoint on a code and the program will stop if it reaches that point. Then you can debug the program (looking at registers, stepping, tracing etc etc).

http://www.szemelyesintegracio.hu/cheats/41-game-hacking-articles/225-basic-encryptions-debugging-backtracing-and-some-info-on-the-stack
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