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Heuristic.pas
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Heuristic.pas
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unit Heuristic;
interface
Uses Windows,Decompiler,Def_know;
Function BranchGetPrevInstructionType (fromAdr:Integer; Var jmpAdr:Integer; loopInfo:TLoopInfo):Integer;
Function IsBplByExport (Const bpl:AnsiString):Boolean;
Function IsInitStackViaLoop (fromAdr, toAdr:Integer):Integer;
Function IsBoundErr (fromAdr:Integer):Integer;
Function IsConnected (fromAdr, toAdr:Integer):Boolean;
Function IsExit (fromAdr:Integer):Boolean;
Function IsGeneralCase (fromAdr:Integer; retAdr:Integer):Integer;
Function IsXorMayBeSkipped (fromAdr:Integer):Boolean;
Function IsAbs (fromAdr:Integer):Integer;
Function IsIntOver (fromAdr:Integer):Integer;
Function IsInlineLengthTest (fromAdr:Integer):Integer;
Function IsInlineLengthCmp (fromAdr:Integer):Integer;
Function IsInlineDiv (fromAdr:Integer; Var _Div:Integer):Integer;
Function IsInlineMod (fromAdr:Integer; Var _Mod:Integer):Integer;
Function MatchCode (code:PAnsiChar; pInfo:PMProcInfo):Boolean;
Function IsTryBegin (fromAdr:Integer; Var endAdr:Integer):Integer;
Function IsTryBegin0 (fromAdr:Integer; Var endAdr:Integer):Integer;
Function IsTryEndPush (fromAdr:Integer; Var endAdr:Integer):Integer;
Function IsTryEndJump (fromAdr:Integer; Var endAdr:Integer):Integer;
Function ProcessInt64Equality (fromAdr:Integer; Var maxAdr:Integer):Integer;
Function ProcessInt64NotEquality (fromAdr:Integer; Var maxAdr:Integer):Integer;
Function ProcessInt64Comparison (fromAdr:Integer; Var maxAdr:Integer):Integer;
Function ProcessInt64ComparisonViaStack1 (fromAdr:Integer; Var maxAdr:Integer):Integer;
Function ProcessInt64ComparisonViaStack2 (fromAdr:Integer; Var maxAdr:Integer):Integer;
Function IsInt64Equality (fromAdr:Integer; Var skip1, skip2:Integer; Var immVal:Boolean; Var Val:Int64):Integer;
Function IsInt64NotEquality (fromAdr:Integer; Var skip1, skip2:Integer; Var immVal:Boolean; Var Val:Int64):Integer;
Function IsInt64Comparison (fromAdr:Integer; Var skip1, skip2:Integer; Var immVal:Boolean; Var Val:Int64):Integer;
Function IsInt64ComparisonViaStack1 (fromAdr:Integer; Var skip1:Integer; Var simEnd:Integer):Integer;
Function IsInt64ComparisonViaStack2 (fromAdr:Integer; Var skip1, skip2:Integer; Var simEnd:Integer):Integer;
Function IsInt64Shr (fromAdr:Integer):Integer;
Function IsInt64Shl (fromAdr:Integer):Integer;
implementation
Uses Def_disasm,Misc,Main,Def_main,Types,Infos;
//-1 - error
//0 - simple if
//1 - jcc down
//2 - jcc up
//3 - jmp down
//4 - jump up
Function BranchGetPrevInstructionType (fromAdr:Integer; Var jmpAdr:Integer; loopInfo:TLoopInfo):Integer;
var
p:Integer;
disInfo:TDisInfo;
Begin
jmpAdr := 0;
p := GetNearestUpInstruction(Adr2Pos(fromAdr));
if p= -1 then
Begin
Result:= -1;
Exit;
end;
frmDisasm.Disassemble(Pos2Adr(p), @disInfo, Nil);
if disInfo.Branch then
begin
if IsExit(disInfo.Immediate) then Result:= 0
else if disInfo.Conditional then
begin
if disInfo.Immediate > Integer(CodeBase) + p then
begin
if Assigned(loopInfo) and (loopInfo.BreakAdr = disInfo.Immediate) then Result:=0
Else Result:=1;
End
else Result:=2;
End
Else if disInfo.Immediate > Integer(CodeBase) + p then
begin
jmpAdr := disInfo.Immediate;
Result:=3;
End
Else if IsFlagSet([cfFinally], p) then
begin
//jmp after jmp @HandleFinally
p := GetNearestUpInstruction(Adr2Pos(disInfo.Immediate));
//push Adr
frmDisasm.Disassemble(Pos2Adr(p), @disInfo, Nil);
if disInfo.Immediate = fromAdr Then Result:=0
Else
begin
jmpAdr := disInfo.Immediate;
Result:=3;
End;
End
else Result:=4;
End
else Result:=0;
end;
Function IsBplByExport (Const bpl:AnsiString):Boolean;
var
pHeader:PImageNtHeaders;
pExport:PImageExportDirectory;
pFuncNames:TIntegerDynArray;
pFuncOrdinals:TWordDynArray;
pFuncAddr:PInteger;
pName:Integer;
imageBase:PAnsiChar;
szDll:PAnsiChar;
hLib:THandle;
curFunc:AnsiString;
i,j,index:Integer;
haveInitializeFunc, haveFinalizeFunc, haveGetPackageInfoTableFunc:Boolean;
Begin
Result:=False;
pHeader:=Nil;
pExport:=Nil;
pFuncNames:=Nil;
pFuncOrdinals:=Nil;
pFuncAddr:=Nil;
pName:=0;
imageBase:=Nil;
szDll:=Nil;
haveInitializeFunc:=False;
haveFinalizeFunc:=False;
haveGetPackageInfoTableFunc:=False;
hLib := LoadLibraryEx(PAnsiChar(bpl), 0, LOAD_LIBRARY_AS_DATAFILE);
imageBase := Pointer(hLib);
if hLib<>0 then
begin
pHeader := PImageNtHeaders(hLib);
if Assigned(pHeader) and (pHeader.OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_EXPORT].VirtualAddress<>0)
and (pHeader.OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_EXPORT].Size<>0) then
begin
pExport := PImageExportDirectory(pHeader.OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_EXPORT].VirtualAddress + imageBase);
szDll := PAnsiChar(imageBase + pExport.Name);
pFuncOrdinals := TWordDynArray(imageBase + Integer(pExport.AddressOfNameOrdinals));
pFuncNames := TIntegerDynArray(imageBase + Integer(pExport.AddressOfNames));
pFuncAddr := PInteger(imageBase + Integer(pExport.AddressOfFunctions));
for i := 0 to pExport.NumberOfFunctions-1 do
begin
index := -1;
for j := 0 to pExport.NumberOfNames-1 do
begin
if pFuncOrdinals[j] = i then
begin
index := j;
break;
end;
end;
if index <> -1 then
begin
pName := pFuncNames[index];
curFunc := PAnsiChar(imageBase + pName);
//Every BPL has a function called @GetPackageInfoTable, Initialize and Finalize.
//lets catch it!
if not haveInitializeFunc then haveInitializeFunc := (curFunc = 'Initialize');
if not haveFinalizeFunc then haveFinalizeFunc := (curFunc = 'Finalize');
if not haveGetPackageInfoTableFunc then
haveGetPackageInfoTableFunc := (curFunc = '@GetPackageInfoTable');
end;
if haveInitializeFunc and haveFinalizeFunc and haveGetPackageInfoTableFunc then break;
end;
result := haveInitializeFunc and haveFinalizeFunc;
End;
FreeLibrary(hLib);
end;
end;
//toAdr:dec reg
Function IsInitStackViaLoop (fromAdr, toAdr:Integer):Integer;
var
stackSize:Integer;
curAdr:Integer;
instrLen:Integer;
disInfo:TDisInfo;
Begin
REsult:=0;
stackSize:=0;
curAdr := fromAdr;
while curAdr <= toAdr do
begin
instrLen := frmDisasm.Disassemble(curAdr, @disInfo, Nil);
//if (!instrLen) return 0;
if instrLen=0 then Inc(curAdr)
//push ...
else if disInfo.Mnem = 'push' then
begin
Inc(stackSize, 4);
Inc(curAdr, instrLen);
end
//add esp, ...
Else if (disInfo.Mnem = 'add') and (disInfo.OpType[0] = otREG)
and (disInfo.OpRegIdx[0] = 20) and (disInfo.OpType[1] = otIMM) then
begin
if disInfo.Immediate < 0 then Dec(stackSize, disInfo.Immediate);
Inc(curAdr, instrLen);
end
//sub esp, ...
else if (disInfo.Mnem = 'sub') and (disInfo.OpType[0] = otREG)
and (disInfo.OpRegIdx[0] = 20) and (disInfo.OpType[1] = otIMM) then
begin
if disInfo.Immediate > 0 then Inc(stackSize, disInfo.Immediate);
Inc(curAdr, instrLen);
end
//dec
Else
begin
if disInfo.Mnem= 'dec' then
begin
Inc(curAdr, instrLen);
if curAdr= toAdr then
Begin
Result:=stackSize;
Exit;
end;
end;
break;
End;
end;
end;
//Check that fromAdr is BoundErr sequence
Function IsBoundErr (fromAdr:Integer):Integer;
var
_pos, instrLen:Integer;
adr:Integer;
recN:InfoRec;
disInfo:TDisInfo;
Begin
REsult:=0;
_pos := Adr2Pos(fromAdr);
adr := fromAdr;
while IsFlagSet([cfSkip], _pos) do
begin
instrLen := frmDisasm.Disassemble(Code + _pos, adr, @disInfo, Nil);
Inc(adr, instrLen);
if (disInfo.Call) and IsValidImageAdr(disInfo.Immediate) then
begin
recN := GetInfoRec(disInfo.Immediate);
if recN.SameName('@BoundErr') Then
Begin
Result:=adr - fromAdr;
Exit;
End;
end;
Inc(_pos, instrLen);
end;
end;
Function IsConnected (fromAdr, toAdr:Integer):Boolean;
var
n, _pos, instrLen:Integer;
adr:Integer;
disInfo:TDisInfo;
Begin
Result:=False;
_pos := Adr2Pos(fromAdr);
adr := fromAdr;
for n := 0 to 31 do
begin
instrLen := frmDisasm.Disassemble(Code + _pos, adr, @disInfo, Nil);
if (disInfo.Conditional) and (disInfo.Immediate = toAdr) Then
begin
Result:=true;
Exit;
end;
Inc(_pos, instrLen);
Inc(adr, instrLen);
end;
end;
//Check that fromAdr points to Exit
Function IsExit (fromAdr:Integer):Boolean;
var
op:BYTE;
_pos, instrLen:Integer;
adr:Integer;
disInfo:TDisInfo;
Begin
Result:=False;
if not IsValidCodeAdr(fromAdr) then Exit;
_pos := Adr2Pos(fromAdr);
adr := fromAdr;
while true do
begin
if not IsFlagSet([cfFinally,cfExcept], _pos) then break;
Inc(_pos, 8);
Inc(adr, 8);
{_instrLen :=} frmDisasm.Disassemble(Code + _pos, adr, @disInfo, Nil);
op := frmDisasm.GetOp(disInfo.Mnem);
if (op = OP_PUSH) or (op = OP_JMP) then
begin
adr := disInfo.Immediate;
_pos := Adr2Pos(adr);
end
else Exit;
end;
while true do
begin
instrLen := frmDisasm.Disassemble(Code + _pos, adr, @disInfo, Nil);
if disInfo.Ret Then
Begin
Result:=true;
Exit;
end;
op := frmDisasm.GetOp(disInfo.Mnem);
if not ((op = OP_POP) or
((op = OP_MOV) and (disInfo.OpType[0] = otREG) and
(IsSameRegister(disInfo.OpRegIdx[0], 16)
or IsSameRegister(disInfo.OpRegIdx[0], 20)))) then Break;
Inc(_pos, instrLen);
Inc(adr, instrLen);
end;
end;
Function IsGeneralCase (fromAdr:Integer; retAdr:Integer):Integer;
Var
regIdx, _pos:Integer;
curAdr,jmpAdr:Integer;
curPos:Integer;
len, num1:Integer;
disInfo:TDisInfo;
Begin
regIdx:=-1;
curAdr := fromAdr;
jmpAdr := 0;
curPos := Adr2Pos(fromAdr);
num1 := 0;
Result:=0;
if not IsValidCodeAdr(fromAdr) then Exit;
while true do
begin
len := frmDisasm.Disassemble(Code + curPos, curAdr, @disInfo, Nil);
//Switch at current address
if IsFlagSet([cfSwitch], curPos) then
begin
frmDisasm.Disassemble(Code + curPos + len, curAdr + len, @disInfo, Nil);
if disInfo.Mnem= 'ja' then
begin
if IsValidCodeAdr(disInfo.Immediate) then
REsult:=disInfo.Immediate;
Exit;
End;
End;
//Switch at next address
if IsFlagSet([cfSwitch], curPos + len) then
begin
len:=len + frmDisasm.Disassemble(Code + curPos + len, curAdr + len, @disInfo, Nil);
frmDisasm.Disassemble(Code + curPos + len, curAdr + len, @disInfo, Nil);
if disInfo.Mnem= 'ja' then
begin
if IsValidCodeAdr(disInfo.Immediate) then
Result:=disInfo.Immediate;
Exit;
End;
End;
//cmp reg, imm
if (disInfo.Mnem = 'cmp') and (disInfo.OpType[0] = otREG) and (disInfo.OpType[1] = otIMM) then
begin
regIdx := disInfo.OpRegIdx[0];
len:=len + frmDisasm.Disassemble(Code + curPos + len, curAdr + len, @disInfo, Nil);
if (disInfo.Mnem = 'jb') or (disInfo.Mnem = 'jg') or (disInfo.Mnem = 'jge') then
begin
if IsGeneralCase(disInfo.Immediate, retAdr)<>0 then
begin
Inc(curAdr,len);
Inc(curPos,len);
len := frmDisasm.Disassemble(Code + curPos, curAdr, @disInfo, Nil);
if (disInfo.Mnem = 'jz') or (disInfo.Mnem = 'je') then
begin
Inc(curAdr,len);
Inc(curPos,len);
//continue;
end;
continue;
End;
break;
End;
End
//sub reg, imm; dec reg
else if ((disInfo.Mnem = 'sub') and (disInfo.OpType[0] = otREG) and (disInfo.OpType[1] = otIMM))
or ((disInfo.Mnem = 'dec') and (disInfo.OpType[0] = otREG)) then
begin
Inc(num1);
if regIdx = -1 then regIdx := disInfo.OpRegIdx[0]
else if not IsSameRegister(regIdx, disInfo.OpRegIdx[0]) Then break;
len:=len + frmDisasm.Disassemble(Code + curPos + len, curAdr + len, @disInfo, Nil);
if (disInfo.Mnem = 'sub') and IsSameRegister(regIdx, disInfo.OpRegIdx[0]) then
len:=len + frmDisasm.Disassemble(Code + curPos + len, curAdr + len, @disInfo, Nil);
if disInfo.Mnem= 'jb' then
begin
Inc(curAdr,len);
Inc(curPos,len);
len := frmDisasm.Disassemble(Code + curPos, curAdr, @disInfo, Nil);
if (disInfo.Mnem= 'jz') or (disInfo.Mnem= 'je') then
begin
Inc(curAdr,len);
Inc(curPos,len);
End;
continue;
End
else if (disInfo.Mnem= 'jz') or (disInfo.Mnem= 'je') then
begin
_pos := GetNearestUpInstruction(Adr2Pos(disInfo.Immediate));
frmDisasm.Disassemble(Code + _pos, Pos2Adr(_pos), @disInfo, Nil);
if disInfo.Mnem= 'jmp' then jmpAdr := disInfo.Immediate;
if disInfo.Ret then jmpAdr := Pos2Adr(GetLastLocPos(retAdr));
Inc(curAdr,len);
Inc(curPos,len);
continue;
End
else if (disInfo.Mnem= 'jnz') or (disInfo.Mnem= 'jne') then
begin
if jmpAdr=0 then
begin
//if only one dec or sub then it is simple if...else construction
if num1 <> 1 then Result:=disInfo.Immediate;
Exit;
End;
if disInfo.Immediate = jmpAdr then
Begin
Result:=jmpAdr;
Exit;
end;
End;
break;
end
//add reg, imm; inc reg
else if ((disInfo.Mnem= 'add') and (disInfo.OpType[0] = otREG) and (disInfo.OpType[1] = otIMM))
or ((disInfo.Mnem= 'inc') and (disInfo.OpType[0] = otREG)) then
begin
Inc(num1);
if regIdx = -1 then regIdx := disInfo.OpRegIdx[0]
else if not IsSameRegister(regIdx, disInfo.OpRegIdx[0]) then break;
len:=len + frmDisasm.Disassemble(Code + curPos + len, curAdr + len, @disInfo, Nil);
if disInfo.Mnem= 'sub' then
begin
len:=len+ frmDisasm.Disassemble(Code + curPos + len, curAdr + len, @disInfo, Nil);
if disInfo.Mnem= 'jb' then
begin
Inc(curAdr,len);
Inc(curPos,len);
continue;
End;
End;
if (disInfo.Mnem= 'jz') or (disInfo.Mnem = 'je') then
begin
Inc(curAdr,len);
Inc(curPos,len);
continue;
End;
break;
End
else if disInfo.Mnem = 'jmp' then
begin
if IsValidCodeAdr(disInfo.Immediate) then Result:=disInfo.Immediate;
Exit;
End;
break;
end;
end;
//check
//xor reg, reg
//mov reg,...
Function IsXorMayBeSkipped (fromAdr:Integer):Boolean;
var
curAdr:Integer;
instrlen, regIdx:Integer;
curPos:Integer;
disInfo:TDisInfo;
Begin
curAdr:=fromAdr;
curPos := Adr2Pos(fromAdr);
Result:=False;
instrlen := frmDisasm.Disassemble(Code + curPos, curAdr, @disInfo, Nil);
if (disInfo.Mnem = 'xor') and (disInfo.OpType[0] = otREG) and (disInfo.OpType[1] = otREG)
and (disInfo.OpRegIdx[0] = disInfo.OpRegIdx[1]) then
begin
regIdx := disInfo.OpRegIdx[0];
Inc(curPos,instrlen);
Inc(curAdr,instrlen);
frmDisasm.Disassemble(Code + curPos, curAdr, @disInfo, Nil);
if (disInfo.Mnem = 'mov') and (disInfo.OpType[0] = otREG)
and IsSameRegister(disInfo.OpRegIdx[0], regIdx) Then
begin
Result:=true;
Exit;
end;
End;
end;
//Check construction (after cdq)
//xor eax, edx
//sub eax, edx
//return bytes to skip, if Abs, else return 0
Function IsAbs (fromAdr:Integer):Integer;
var
curPos,instrLen,curAdr:Integer;
disInfo:TDisInfo;
Begin
REsult:=0;
curPos:=Adr2Pos(fromAdr);
curAdr:=fromAdr;
instrLen := frmDisasm.Disassemble(Code + curPos, curAdr, @disInfo, Nil);
if (disInfo.Mnem= 'xor') and
(disInfo.OpType[0] = otREG) and
(disInfo.OpType[1] = otREG) and
(disInfo.OpRegIdx[0] = 16) and
(disInfo.OpRegIdx[1] = 18) then
begin
Inc(curPos, instrLen);
Inc(curAdr,instrLen);
instrLen := frmDisasm.Disassemble(Code + curPos, curAdr, @disInfo, Nil);
if (disInfo.Mnem= 'sub') and
(disInfo.OpType[0] = otREG) and
(disInfo.OpType[1] = otREG) and
(disInfo.OpRegIdx[0] = 16) and
(disInfo.OpRegIdx[1] = 18) then REsult:=curAdr + instrLen - fromAdr;
End;
end;
//Check construction
//jxx @1
//call @IntOver
//@1:
//return bytes to skip, if @IntOver, else return 0
Function IsIntOver (fromAdr:Integer):Integer;
var
instrLen, curPos,curAdr:Integer;
recN:InfoRec;
disInfo:TDisInfo;
Begin
Result:=0;
curPos:=Adr2Pos(fromAdr);
curAdr:=fromAdr;
instrLen := frmDisasm.Disassemble(Code + curPos, curAdr, @disInfo, Nil);
if disInfo.Branch and disInfo.Conditional then
begin
Inc(curPos,instrLen);
Inc(curAdr,instrLen);
instrLen := frmDisasm.Disassemble(Code + curPos, curAdr, @disInfo, Nil);
if disInfo.Call then
if IsValidCodeAdr(disInfo.Immediate) then
begin
recN := GetInfoRec(disInfo.Immediate);
if Assigned(recN) and recN.SameName('@IntOver') then Result:=curAdr + instrLen - fromAdr;
End;
end;
end;
//Check construction (test reg, reg)
//test reg, reg
//jz @1
//mov reg, [reg-4]
//or-------------------------------------------------------------------------
//test reg, reg
//jz @1
//sub reg, 4
//mov reg, [reg]
Function IsInlineLengthTest (fromAdr:Integer):Integer;
var
curPos,instrLen, regIdx:Integer;
adr,curAdr:Integer;
disInfo:TDisInfo;
Begin
Result:=0;
curPos := Adr2Pos(fromAdr);
curAdr:=fromAdr;
instrLen := frmDisasm.Disassemble(Code + curPos, curAdr, @disInfo, Nil);
if (disInfo.Mnem = 'test') and
(disInfo.OpType[0] = otREG) and
(disInfo.OpType[1] = otREG) and
(disInfo.OpRegIdx[0] = disInfo.OpRegIdx[1]) then
begin
regIdx := disInfo.OpRegIdx[0];
Inc(curPos,instrLen);
Inc(curAdr,instrLen);
instrLen := frmDisasm.Disassemble(Code + curPos, curAdr, @disInfo, Nil);
if (disInfo.Mnem= 'jz') or (disInfo.Mnem = 'je') then
begin
adr := disInfo.Immediate;
Inc(curPos,instrLen);
Inc(curAdr,instrLen);
instrLen := frmDisasm.Disassemble(Code + curPos, curAdr, @disInfo, Nil);
//mov reg, [reg-4]
if (disInfo.Mnem = 'mov') and
(disInfo.OpType[0] = otREG) and
(disInfo.OpType[1] = otMEM) and
(disInfo.BaseReg = regIdx) and
(disInfo.IndxReg = -1) and
(disInfo.Offset = -4) then
begin
if adr = curAdr + instrLen then
Begin
Result:=curAdr + instrLen - fromAdr;
Exit;
end;
end
//sub reg, 4
else if (disInfo.Mnem = 'sub') and
(disInfo.OpType[0] = otREG) and
(disInfo.OpType[1] = otIMM) and
(disInfo.Immediate = 4) then
begin
Inc(curPos,instrLen);
Inc(curAdr,instrLen);
instrLen := frmDisasm.Disassemble(Code + curPos, curAdr, @disInfo, Nil);
//mov reg, [reg]
if (disInfo.Mnem = 'mov') and
(disInfo.OpType[0] = otREG) and
(disInfo.OpType[1] = otMEM) and
(disInfo.BaseReg = regIdx) and
(disInfo.IndxReg = -1) and
(disInfo.Offset = 0) then
begin
if adr = curAdr + instrLen Then
Begin
Result:=curAdr + instrLen - fromAdr;
Exit;
end;
end;
end;
end;
end;
end;
//cmp [lvar], 0
//jz @1
//mov reg, [lvar]
//sub reg, 4
//mov reg, [reg]
//mov [lvar], reg
Function IsInlineLengthCmp (fromAdr:Integer):Integer;
var
op:BYTE;
curPos,instrLen, regIdx:Integer;
baseReg, offset:Integer;
adr, curAdr:Integer;
disInfo:TDisInfo;
Begin
Result:=0;
curPos := Adr2Pos(fromAdr);
curAdr:=fromAdr;
instrLen := frmDisasm.Disassemble(Code + curPos, curAdr, @disInfo, Nil);
op := frmDisasm.GetOp(disInfo.Mnem);
if (op = OP_CMP) and
(disInfo.OpType[0] = otMEM) and
(disInfo.OpType[1] = otIMM) and
(disInfo.Immediate = 0) then
begin
baseReg := disInfo.BaseReg;
offset := disInfo.Offset;
Inc(curPos,instrLen);
Inc(curAdr,instrLen);
instrLen := frmDisasm.Disassemble(Code + curPos, curAdr, @disInfo, Nil);
if (disInfo.Mnem = 'jz') or (disInfo.Mnem = 'je') then
begin
adr := disInfo.Immediate;
Inc(curPos,instrLen);
Inc(curAdr,instrLen);
instrLen := frmDisasm.Disassemble(Code + curPos, curAdr, @disInfo, Nil);
op := frmDisasm.GetOp(disInfo.Mnem);
//mov reg, [lvar]
if (op = OP_MOV) and
(disInfo.OpType[0] = otREG) and
(disInfo.OpType[1] = otMEM) and
(disInfo.BaseReg = baseReg) and
(disInfo.Offset = offset) then
begin
regIdx := disInfo.OpRegIdx[0];
Inc(curPos,instrLen);
Inc(curAdr,instrLen);
instrLen := frmDisasm.Disassemble(Code + curPos, curAdr, @disInfo, Nil);
op := frmDisasm.GetOp(disInfo.Mnem);
//sub reg, 4
if (op = OP_SUB) and
(disInfo.OpType[0] = otREG) and
(disInfo.OpType[1] = otIMM) and
(disInfo.Immediate = 4) then
begin
Inc(curPos,instrLen);
Inc(curAdr,instrLen);
instrLen := frmDisasm.Disassemble(Code + curPos, curAdr, @disInfo, Nil);
op := frmDisasm.GetOp(disInfo.Mnem);
//mov reg, [reg]
if (op = OP_MOV) and
(disInfo.OpType[0] = otREG) and
(disInfo.OpType[1] = otMEM) and
(disInfo.BaseReg = regIdx) and
(disInfo.IndxReg = -1) and
(disInfo.Offset = 0) then
begin
Inc(curPos,instrLen);
Inc(curAdr,instrLen);
instrLen := frmDisasm.Disassemble(Code + curPos, curAdr, @disInfo, Nil);
op := frmDisasm.GetOp(disInfo.Mnem);
//mov [lvar], reg
if (op = OP_MOV) and
(disInfo.OpType[0] = otMEM) and
(disInfo.OpType[1] = otREG) and
(disInfo.BaseReg = baseReg) and
(disInfo.Offset = offset) then
begin
if adr = curAdr + instrLen Then
Begin
Result:=curAdr + instrLen - fromAdr;
Exit;
End;
end;
End;
End;
End;
End;
end;
end;
//test reg, reg
//jns @1
//add reg, (2^k - 1)
//sar reg, k
//@1
Function IsInlineDiv (fromAdr:Integer; Var _Div:Integer):Integer;
Var
op:BYTE;
curPos, instrLen, regIdx:Integer;
curAdr, imm:Integer;
disInfo:TDisInfo;
Begin
Result:=0;
curPos := Adr2Pos(fromAdr);
curAdr:=fromAdr;
instrLen := frmDisasm.Disassemble(Code + curPos, curAdr, @disInfo, Nil);
op := frmDisasm.GetOp(disInfo.Mnem);
if (op = OP_TEST) and
(disInfo.OpType[0] = otREG) and
(disInfo.OpType[1] = otREG) and
(disInfo.OpRegIdx[0] = disInfo.OpRegIdx[1]) then
begin
regIdx := disInfo.OpRegIdx[0];
Inc(curPos,instrLen);
Inc(curAdr,instrLen);
instrLen := frmDisasm.Disassemble(Code + curPos, curAdr, @disInfo, Nil);
//op := frmDisasm.GetOp(disInfo.Mnem);
if disInfo.Mnem = 'jns' then
begin
//adr := disInfo.Immediate;
Inc(curPos,instrLen);
Inc(curAdr,instrLen);
instrLen := frmDisasm.Disassemble(Code + curPos, curAdr, @disInfo, Nil);
op := frmDisasm.GetOp(disInfo.Mnem);
if (op = OP_ADD) and
(disInfo.OpType[0] = otREG) and
(disInfo.OpRegIdx[0] = regIdx) and
(disInfo.OpType[1] = otIMM) then
begin
imm := disInfo.Immediate + 1;
Inc(curPos,instrLen);
Inc(curAdr,instrLen);
instrLen := frmDisasm.Disassemble(Code + curPos, curAdr, @disInfo, Nil);
op := frmDisasm.GetOp(disInfo.Mnem);
if (op = OP_SAR) and
(disInfo.OpType[0] = otREG) and
(disInfo.OpRegIdx[0] = regIdx) and
(disInfo.OpType[1] = otIMM) then
begin
if (1 shl disInfo.Immediate) = imm then
begin
_div := imm;
Result:=curAdr + instrLen - fromAdr;
Exit;
end;
End;
end;
End;
end;
end;
//and reg, imm
//jns @1
//dec reg
//or reg, imm
//inc reg
//@1
Function IsInlineMod (fromAdr:Integer; Var _Mod:Integer):Integer;
var
op:BYTE;
curPos, instrLen, regIdx:Integer;
adr, curAdr, imm:Integer;
disInfo:TDisInfo;
Begin
Result:=0;
curPos := Adr2Pos(fromAdr);
curAdr:=fromAdr;
instrLen := frmDisasm.Disassemble(Code + curPos, curAdr, @disInfo, Nil);
op := frmDisasm.GetOp(disInfo.Mnem);
if (op = OP_AND) and
(disInfo.OpType[0] = otREG) and
(disInfo.OpType[1] = otIMM) and
((disInfo.Immediate and $80000000) <> 0) then
begin
regIdx := disInfo.OpRegIdx[0];
imm := disInfo.Immediate and $7FFFFFFF;
Inc(curPos,instrLen);
Inc(curAdr,instrLen);
instrLen := frmDisasm.Disassemble(Code + curPos, curAdr, @disInfo, Nil);
if disInfo.Mnem = 'jns' then
begin
adr := disInfo.Immediate;
Inc(curPos,instrLen);
Inc(curAdr,instrLen);
instrLen := frmDisasm.Disassemble(Code + curPos, curAdr, @disInfo, Nil);
op := frmDisasm.GetOp(disInfo.Mnem);
if (op = OP_DEC) and
(disInfo.OpType[0] = otREG) and
(disInfo.OpRegIdx[0] = regIdx) then
begin
Inc(curPos,instrLen);
Inc(curAdr,instrLen);
instrLen := frmDisasm.Disassemble(Code + curPos, curAdr, @disInfo, Nil);
op := frmDisasm.GetOp(disInfo.Mnem);
if (op = OP_OR) and
(disInfo.OpType[0] = otREG) and
(disInfo.OpType[1] = otIMM) and
(disInfo.OpRegIdx[0] = regIdx) and
(disInfo.Immediate + imm = -1) then
begin
Inc(curPos,instrLen);
Inc(curAdr,instrLen);
instrLen := frmDisasm.Disassemble(Code + curPos, curAdr, @disInfo, Nil);
op := frmDisasm.GetOp(disInfo.Mnem);
if (op = OP_INC) and
(disInfo.OpType[0] = otREG) and
(disInfo.OpRegIdx[0] = regIdx) then
begin
if adr = curAdr + instrLen then
begin
_mod := imm + 1;
Result:=curAdr + instrLen - fromAdr;
Exit;
end;
end;
end;
end;
end;
end;
end;
function MatchCode(code:PAnsiChar; pInfo:PMProcInfo): Boolean;
var
_dumpSz,n:Integer;
_dump,_reloc:PAnsiChar;
Begin
REsult:=False;
if (code=Nil) or (pInfo=Nil) then Exit;
_dumpSz := pInfo.DumpSz;
//ret
if _dumpSz < 2 then Exit;
_dump := pInfo.Dump;
_reloc := _dump + _dumpSz;
//jmp XXXXXXXX
if (_dumpSz = 5) and (_dump[0] = #$E9) and (_reloc[1] = #$FF) then Exit;
//call XXXXXXXX ret
if (_dumpSz = 6) and (_dump[0] = #$E8) and (_reloc[1] = #$FF) and (_dump[5] = #$C3) then Exit;
n := 0;
While n<_dumpSz do
begin
//Relos skip
if _reloc[n] = #$FF then
begin
Inc(n, 4);
continue;
End;
if code[n] <> _dump[n] Then Exit;
Inc(n);
end;
Result:=true;
end;
//Check try construction
//xor reg, reg
//push ebp
//push XXXXXXXX
//push fs:[reg]
//mov fs:[reg], esp
Function IsTryBegin (fromAdr:Integer; Var endAdr:Integer):Integer;
var
op:BYTE;
n,instrLen:Integer;
curAdr, _endAdr:Integer;
disInfo:TDisInfo;
Begin
Result:=0;
curAdr := fromAdr;
for n:=1 to 5 do
begin
instrLen := frmDisasm.Disassemble(curAdr, @disInfo, Nil);
op := frmDisasm.GetOp(disInfo.Mnem);
Case n Of
1: if Not ((op = OP_XOR) and (disInfo.OpType[0] = disInfo.OpType[1])
and (disInfo.OpRegIdx[0] = disInfo.OpRegIdx[1])) then Exit;
2: if not ((op = OP_PUSH) and (disInfo.OpRegIdx[0] = 21)) then Exit;
3:
begin
if not ((op = OP_PUSH) and (disInfo.OpType[0] = otIMM)) then Exit;
_endAdr := disInfo.Immediate;
End;
4: if not ((op = OP_PUSH) and (disInfo.OpType[0] = otMEM)
and (disInfo.SegPrefix = 4) and (disInfo.BaseReg <> -1)) then Exit;
5:
begin
if not ((op = OP_MOV) and (disInfo.OpType[0] = otMEM)
and (disInfo.SegPrefix = 4) and (disInfo.BaseReg <> -1)) then Exit;
endAdr := _endAdr;
Result:=curAdr + instrLen - fromAdr;
Exit;
end;
End;
if disInfo.Ret then Exit;
Inc(curAdr,instrLen);
end;
end;
//Check try construction (Delphi3:Atlantis.exe at 0x50D676)
//push ebp
//push XXXXXXXX
//push fs:[0]
//mov fs:[0], esp
Function IsTryBegin0 (fromAdr:Integer; Var endAdr:Integer):Integer;
var
op:BYTE;
n,instrLen:Integer;
curAdr, _endAdr:Integer;
disInfo:TDisInfo;
Begin
Result:=0;
curAdr := fromAdr;
for n:=1 to 4 do
begin
instrLen := frmDisasm.Disassemble(curAdr, @disInfo, Nil);
op := frmDisasm.GetOp(disInfo.Mnem);
case n of
1: if not ((op = OP_PUSH) and (disInfo.OpRegIdx[0] = 21)) then Exit;
2:
begin
if not ((op = OP_PUSH) and (disInfo.OpType[0] = otIMM)) then Exit;
_endAdr := disInfo.Immediate;
end;
3: if not ((op = OP_PUSH) and (disInfo.OpType[0] = otMEM) And
(disInfo.SegPrefix = 4) and (disInfo.BaseReg = -1) and (disInfo.Offset = 0)) Then Exit;
4:
begin
if not ((op = OP_MOV) and (disInfo.OpType[0] = otMEM) and
(disInfo.SegPrefix = 4) and (disInfo.BaseReg = -1) and (disInfo.Offset = 0)) then Exit;
endAdr := _endAdr;
Result:=curAdr + instrLen - fromAdr;
Exit;
End;
End;
if disInfo.Ret then Exit;
Inc(curAdr,instrLen);
end;
end;
//Check finally construction
//xor reg,reg
//pop reg
//pop reg
//pop reg
//mov fs:[reg],reg
//push XXXXXXXX
Function IsTryEndPush (fromAdr:Integer; Var endAdr:Integer):Integer;
var
op:BYTE;
n,instrLen, curAdr:Integer;
disInfo:TDisInfo;
Begin
Result:=0;
curAdr := fromAdr;
for n:=1 to 6 Do
begin
instrLen := frmDisasm.Disassemble(curAdr, @disInfo, Nil);
op := frmDisasm.GetOp(disInfo.Mnem);
Case n Of
1: if not ((op = OP_XOR) and (disInfo.OpType[0] = disInfo.OpType[1])
and (disInfo.OpRegIdx[0] = disInfo.OpRegIdx[1])) then Exit;
2,3,4: if not ((op = OP_POP) and (disInfo.OpType[0] = otREG)) then Exit;
5: if not ((op = OP_MOV) and (disInfo.OpType[0] = otMEM)
and (disInfo.SegPrefix = 4) and (disInfo.BaseReg <> -1)) Then Exit;
6:
begin
if not ((op = OP_PUSH) and (disInfo.OpType[0] = otIMM)) then Exit;
endAdr := disInfo.Immediate;
Result:=curAdr + instrLen - fromAdr;
Exit;
end;
end;
if disInfo.Ret then Exit;
Inc(curAdr,instrLen);
end;
end;