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//Pako inflate: https://github.com/nodeca/pako/blob/master/dist/pako_inflate.min.js
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13:if(i.last){l>>>=7&d,d-=7&d,i.mode=27;break}for(;d<3;){if(0===s)break e;s--,l+=n[r++]<<d,d+=8}switch(i.last=1&l,d-=1,3&(l>>>=1)){case 0:i.mode=14;break;case 1:if(H(i),i.mode=20,6!==t)break;l>>>=2,d-=2;break e;case 2:i.mode=17;break;case 3:e.msg="invalid block type",i.mode=30}l>>>=2,d-=2;break;case 14:for(l>>>=7&d,d-=7&d;d<32;){if(0===s)break e;s--,l+=n[r++]<<d,d+=8}if((65535&l)!=(l>>>16^65535)){e.msg="invalid stored block lengths",i.mode=30;break}if(i.length=65535&l,d=l=0,i.mode=15,6===t)break e;case 15:i.mode=16;case 16:if(h=i.length){if(s<h&&(h=s),f<h&&(h=f),0===h)break e;z.arraySet(a,n,r,h,o),s-=h,r+=h,f-=h,o+=h,i.length-=h;break}i.mode=12;break;case 17:for(;d<14;){if(0===s)break e;s--,l+=n[r++]<<d,d+=8}if(i.nlen=257+(31&l),l>>>=5,d-=5,i.ndist=1+(31&l),l>>>=5,d-=5,i.ncode=4+(15&l),l>>>=4,d-=4,286<i.nlen||30<i.ndist){e.msg="too many length or distance symbols",i.mode=30;break}i.have=0,i.mode=18;case 18:for(;i.have<i.ncode;){for(;d<3;){if(0===s)break e;s--,l+=n[r++]<<d,d+=8}i.lens[A[i.have++]]=7&l,l>>>=3,d-=3}for(;i.have<19;)i.lens[A[i.have++]]=0;if(i.lencode=i.lendyn,i.lenbits=7,S={bits:i.lenbits},y=C(0,i.lens,0,19,i.lencode,0,i.work,S),i.lenbits=S.bits,y){e.msg="invalid code lengths set",i.mode=30;break}i.have=0,i.mode=19;case 19:for(;i.have<i.nlen+i.ndist;){for(;k=(Z=i.lencode[l&(1<<i.lenbits)-1])>>>16&255,_=65535&Z,!((w=Z>>>24)<=d);){if(0===s)break e;s--,l+=n[r++]<<d,d+=8}if(_<16)l>>>=w,d-=w,i.lens[i.have++]=_;else{if(16===_){for(E=w+2;d<E;){if(0===s)break e;s--,l+=n[r++]<<d,d+=8}if(l>>>=w,d-=w,0===i.have){e.msg="invalid bit length repeat",i.mode=30;break}x=i.lens[i.have-1],h=3+(3&l),l>>>=2,d-=2}else if(17===_){for(E=w+3;d<E;){if(0===s)break e;s--,l+=n[r++]<<d,d+=8}d-=w,x=0,h=3+(7&(l>>>=w)),l>>>=3,d-=3}else{for(E=w+7;d<E;){if(0===s)break e;s--,l+=n[r++]<<d,d+=8}d-=w,x=0,h=11+(127&(l>>>=w)),l>>>=7,d-=7}if(i.have+h>i.nlen+i.ndist){e.msg="invalid bit length repeat",i.mode=30;break}for(;h--;)i.lens[i.have++]=x}}if(30===i.mode)break;if(0===i.lens[256]){e.msg="invalid code -- missing end-of-block",i.mode=30;break}if(i.lenbits=9,S={bits:i.lenbits},y=C(I,i.lens,0,i.nlen,i.lencode,0,i.work,S),i.lenbits=S.bits,y){e.msg="invalid literal/lengths set",i.mode=30;break}if(i.distbits=6,i.distcode=i.distdyn,S={bits:i.distbits},y=C(D,i.lens,i.nlen,i.ndist,i.distcode,0,i.work,S),i.distbits=S.bits,y){e.msg="invalid distances set",i.mode=30;break}if(i.mode=20,6===t)break e;case 20:i.mode=21;case 21:if(6<=s&&258<=f){e.next_out=o,e.avail_out=f,e.next_in=r,e.avail_in=s,i.hold=l,i.bits=d,O(e,u),o=e.next_out,a=e.output,f=e.avail_out,r=e.next_in,n=e.input,s=e.avail_in,l=i.hold,d=i.bits,12===i.mode&&(i.back=-1);break}for(i.back=0;k=(Z=i.lencode[l&(1<<i.lenbits)-1])>>>16&255,_=65535&Z,!((w=Z>>>24)<=d);){if(0===s)break e;s--,l+=n[r++]<<d,d+=8}if(k&&0==(240&k)){for(g=w,v=k,p=_;k=(Z=i.lencode[p+((l&(1<<g+v)-1)>>g)])>>>16&255,_=65535&Z,!(g+(w=Z>>>24)<=d);){if(0===s)break e;s--,l+=n[r++]<<d,d+=8}l>>>=g,d-=g,i.back+=g}if(l>>>=w,d-=w,i.back+=w,i.length=_,0===k){i.mode=26;break}if(32&k){i.back=-1,i.mode=12;break}if(64&k){e.msg="invalid literal/length code",i.mode=30;break}i.extra=15&k,i.mode=22;case 22:if(i.extra){for(E=i.extra;d<E;){if(0===s)break e;s--,l+=n[r++]<<d,d+=8}i.length+=l&(1<<i.extra)-1,l>>>=i.extra,d-=i.extra,i.back+=i.extra}i.was=i.length,i.mode=23;case 23:for(;k=(Z=i.distcode[l&(1<<i.distbits)-1])>>>16&255,_=65535&Z,!((w=Z>>>24)<=d);){if(0===s)break e;s--,l+=n[r++]<<d,d+=8}if(0==(240&k)){for(g=w,v=k,p=_;k=(Z=i.distcode[p+((l&(1<<g+v)-1)>>g)])>>>16&255,_=65535&Z,!(g+(w=Z>>>24)<=d);){if(0===s)break e;s--,l+=n[r++]<<d,d+=8}l>>>=g,d-=g,i.back+=g}if(l>>>=w,d-=w,i.back+=w,64&k){e.msg="invalid distance code",i.mode=30;break}i.offset=_,i.extra=15&k,i.mode=24;case 24:if(i.extra){for(E=i.extra;d<E;){if(0===s)break e;s--,l+=n[r++]<<d,d+=8}i.offset+=l&(1<<i.extra)-1,l>>>=i.extra,d-=i.extra,i.back+=i.extra}if(i.offset>i.dmax){e.msg="invalid distance too far back",i.mode=30;break}i.mode=25;case 25:if(0===f)break e;if(h=u-f,i.offset>h){if((h=i.offset-h)>i.whave&&i.sane){e.msg="invalid distance too far back",i.mode=30;break}h>i.wnext?(h-=i.wnext,b=i.wsize-h):b=i.wnext-h,h>i.length&&(h=i.length),m=i.window}else m=a,b=o-i.offset,h=i.length;for(f<h&&(h=f),f-=h,i.length-=h;a[o++]=m[b++],--h;);0===i.length&&(i.mode=21);break;case 26:if(0===f)break e;a[o++]=i.length,f--,i.mode=21;break;case 27:if(i.wrap){for(;d<32;){if(0===s)break e;s--,l|=n[r++]<<d,d+=8}if(u-=f,e.total_out+=u,i.total+=u,u&&(e.adler=i.check=i.flags?N(i.check,a,u,o-u):R(i.check,a,u,o-u)),u=f,(i.flags?l:L(l))!==i.check){e.msg="incorrect data check",i.mode=30;break}d=l=0}i.mode=28;case 28:if(i.wrap&&i.flags){for(;d<32;){if(0===s)break e;s--,l+=n[r++]<<d,d+=8}if(l!==(4294967295&i.total)){e.msg="incorrect length check",i.mode=30;break}d=l=0}i.mode=29;case 29:y=1;break e;case 30:y=-3;break e;case 31:return-4;case 32:default:return U}return e.next_out=o,e.avail_out=f,e.next_in=r,e.avail_in=s,i.hold=l,i.bits=d,(i.wsize||u!==e.avail_out&&i.mode<30&&(i.mode<27||4!==t))&&j(e,e.output,e.next_out,u-e.avail_out)?(i.mode=31,-4):(c-=e.avail_in,u-=e.avail_out,e.total_in+=c,e.total_out+=u,i.total+=u,i.wrap&&u&&(e.adler=i.check=i.flags?N(i.check,a,u,e.next_out-u):R(i.check,a,u,e.next_out-u)),e.data_type=i.bits+(i.last?64:0)+(12===i.mode?128:0)+(20===i.mode||15===i.mode?256:0),(0===c&&0===u||4===t)&&y===T&&(y=-5),y)},i.inflateEnd=function(e){if(!e||!e.state)return U;var t=e.state;return t.window&&(t.window=null),e.state=null,T},i.inflateGetHeader=function(e,t){var i;return e&&e.state?0==(2&(i=e.state).wrap)?U:((i.head=t).done=!1,T):U},i.inflateSetDictionary=function(e,t){var i,n=t.length;return e&&e.state?0!==(i=e.state).wrap&&11!==i.mode?U:11===i.mode&&R(1,t,n,0)!==i.check?-3:j(e,t,n,n)?(i.mode=31,-4):(i.havedict=1,T):U},i.inflateInfo="pako inflate (from Nodeca project)"},{"../utils/common":1,"./adler32":3,"./crc32":5,"./inffast":7,"./inftrees":9}],9:[function(e,t,i){"use strict";var I=e("../utils/common"),D=[3,4,5,6,7,8,9,10,11,13,15,17,19,23,27,31,35,43,51,59,67,83,99,115,131,163,195,227,258,0,0],T=[16,16,16,16,16,16,16,16,17,17,17,17,18,18,18,18,19,19,19,19,20,20,20,20,21,21,21,21,16,72,78],U=[1,2,3,4,5,7,9,13,17,25,33,49,65,97,129,193,257,385,513,769,1025,1537,2049,3073,4097,6145,8193,12289,16385,24577,0,0],F=[16,16,16,16,17,17,18,18,19,19,20,20,21,21,22,22,23,23,24,24,25,25,26,26,27,27,28,28,29,29,64,64];t.exports=function(e,t,i,n,a,r,o,s){var f,l,d,c,u,h,b,m,w,k=s.bits,_=0,g=0,v=0,p=0,x=0,y=0,S=0,E=0,Z=0,B=0,A=null,z=0,R=new I.Buf16(16),N=new I.Buf16(16),O=null,C=0;for(_=0;_<=15;_++)R[_]=0;for(g=0;g<n;g++)R[t[i+g]]++;for(x=k,p=15;1<=p&&0===R[p];p--);if(p<x&&(x=p),0===p)return a[r++]=20971520,a[r++]=20971520,s.bits=1,0;for(v=1;v<p&&0===R[v];v++);for(x<v&&(x=v),_=E=1;_<=15;_++)if(E<<=1,(E-=R[_])<0)return-1;if(0<E&&(0===e||1!==p))return-1;for(N[1]=0,_=1;_<15;_++)N[_+1]=N[_]+R[_];for(g=0;g<n;g++)0!==t[i+g]&&(o[N[t[i+g]]++]=g);if(0===e?(A=O=o,h=19):1===e?(A=D,z-=257,O=T,C-=257,h=256):(A=U,O=F,h=-1),_=v,u=r,S=g=B=0,d=-1,c=(Z=1<<(y=x))-1,1===e&&852<Z||2===e&&592<Z)return 1;for(;;){for(b=_-S,o[g]<h?(m=0,w=o[g]):o[g]>h?(m=O[C+o[g]],w=A[z+o[g]]):(m=96,w=0),f=1<<_-S,v=l=1<<y;a[u+(B>>S)+(l-=f)]=b<<24|m<<16|w|0,0!==l;);for(f=1<<_-1;B&f;)f>>=1;if(0!==f?(B&=f-1,B+=f):B=0,g++,0==--R[_]){if(_===p)break;_=t[i+o[g]]}if(x<_&&(B&c)!==d){for(0===S&&(S=x),u+=v,E=1<<(y=_-S);y+S<p&&!((E-=R[y+S])<=0);)y++,E<<=1;if(Z+=1<<y,1===e&&852<Z||2===e&&592<Z)return 1;a[d=B&c]=x<<24|y<<16|u-r|0}}return 0!==B&&(a[u+B]=_-S<<24|64<<16|0),s.bits=x,0}},{"../utils/common":1}],10:[function(e,t,i){"use strict";t.exports={2:"need dictionary",1:"stream end",0:"","-1":"file error","-2":"stream error","-3":"data error","-4":"insufficient memory","-5":"buffer error","-6":"incompatible version"}},{}],11:[function(e,t,i){"use strict";t.exports=function(){this.input=null,this.next_in=0,this.avail_in=0,this.total_in=0,this.output=null,this.next_out=0,this.avail_out=0,this.total_out=0,this.msg="",this.state=null,this.data_type=2,this.adler=0}},{}],"/lib/inflate.js":[function(e,t,i){"use strict";var c=e("./zlib/inflate"),u=e("./utils/common"),h=e("./utils/strings"),b=e("./zlib/constants"),n=e("./zlib/messages"),a=e("./zlib/zstream"),r=e("./zlib/gzheader"),m=Object.prototype.toString;function o(e){if(!(this instanceof o))return new o(e);this.options=u.assign({chunkSize:16384,windowBits:0,to:""},e||{});var t=this.options;t.raw&&0<=t.windowBits&&t.windowBits<16&&(t.windowBits=-t.windowBits,0===t.windowBits&&(t.windowBits=-15)),!(0<=t.windowBits&&t.windowBits<16)||e&&e.windowBits||(t.windowBits+=32),15<t.windowBits&&t.windowBits<48&&0==(15&t.windowBits)&&(t.windowBits|=15),this.err=0,this.msg="",this.ended=!1,this.chunks=[],this.strm=new a,this.strm.avail_out=0;var i=c.inflateInit2(this.strm,t.windowBits);if(i!==b.Z_OK)throw new Error(n[i]);if(this.header=new r,c.inflateGetHeader(this.strm,this.header),t.dictionary&&("string"==typeof t.dictionary?t.dictionary=h.string2buf(t.dictionary):"[object ArrayBuffer]"===m.call(t.dictionary)&&(t.dictionary=new Uint8Array(t.dictionary)),t.raw&&(i=c.inflateSetDictionary(this.strm,t.dictionary))!==b.Z_OK))throw new Error(n[i])}function s(e,t){var i=new o(t);if(i.push(e,!0),i.err)throw i.msg||n[i.err];return i.result}o.prototype.push=function(e,t){var i,n,a,r,o,s=this.strm,f=this.options.chunkSize,l=this.options.dictionary,d=!1;if(this.ended)return!1;n=t===~~t?t:!0===t?b.Z_FINISH:b.Z_NO_FLUSH,"string"==typeof e?s.input=h.binstring2buf(e):"[object ArrayBuffer]"===m.call(e)?s.input=new Uint8Array(e):s.input=e,s.next_in=0,s.avail_in=s.input.length;do{if(0===s.avail_out&&(s.output=new u.Buf8(f),s.next_out=0,s.avail_out=f),(i=c.inflate(s,b.Z_NO_FLUSH))===b.Z_NEED_DICT&&l&&(i=c.inflateSetDictionary(this.strm,l)),i===b.Z_BUF_ERROR&&!0===d&&(i=b.Z_OK,d=!1),i!==b.Z_STREAM_END&&i!==b.Z_OK)return this.onEnd(i),!(this.ended=!0);s.next_out&&(0!==s.avail_out&&i!==b.Z_STREAM_END&&(0!==s.avail_in||n!==b.Z_FINISH&&n!==b.Z_SYNC_FLUSH)||("string"===this.options.to?(a=h.utf8border(s.output,s.next_out),r=s.next_out-a,o=h.buf2string(s.output,a),s.next_out=r,s.avail_out=f-r,r&&u.arraySet(s.output,s.output,a,r,0),this.onData(o)):this.onData(u.shrinkBuf(s.output,s.next_out)))),0===s.avail_in&&0===s.avail_out&&(d=!0)}while((0<s.avail_in||0===s.avail_out)&&i!==b.Z_STREAM_END);return i===b.Z_STREAM_END&&(n=b.Z_FINISH),n===b.Z_FINISH?(i=c.inflateEnd(this.strm),this.onEnd(i),this.ended=!0,i===b.Z_OK):n!==b.Z_SYNC_FLUSH||(this.onEnd(b.Z_OK),!(s.avail_out=0))},o.prototype.onData=function(e){this.chunks.push(e)},o.prototype.onEnd=function(e){e===b.Z_OK&&("string"===this.options.to?this.result=this.chunks.join(""):this.result=u.flattenChunks(this.chunks)),this.chunks=[],this.err=e,this.msg=this.strm.msg},i.Inflate=o,i.inflate=s,i.inflateRaw=function(e,t){return(t=t||{}).raw=!0,s(e,t)},i.ungzip=s},{"./utils/common":1,"./utils/strings":2,"./zlib/constants":4,"./zlib/gzheader":6,"./zlib/inflate":8,"./zlib/messages":10,"./zlib/zstream":11}]},{},[])("/lib/inflate.js")});
</script>
<script>
//Regexp to find base64 encoded strings
function findb64(txt)
{
var re = new RegExp('[a-zA-Z0-9=/+]{30,}');
return re.exec(txt)[0];
}
//convert ascii to hex
function ascii_to_hex(str)
{
var arr1 = [];
for (var n = 0, l = str.length; n < l; n ++)
{
var hex = Number(str.charCodeAt(n)).toString(16).padStart(2, '0');
arr1.push(hex);
}
return arr1.join('');
}
//look for IP and port in hex-encoded shellcode
function findIOC(sc)
{
var regexp = ['68([0-9a-f]{8})680200([0-9a-f]{4})','49bc0200([0-9a-f]{4})([0-9a-f]{8})'];
for (var i=0; i < regexp.length; i++)
{
var re = new RegExp(regexp[i]);
var result = re.exec(sc);
//console.log(sc);
if (result != null)
{
break;
}
}
if (result == null)
{
return [];
}
else
{
if (result[1].length == 8)
{
var ip_port = [result[1], result[2]];
}
else
{
var ip_port = [result[2], result[1]];
}
return ip_port;
}
}
function hex_to_ip(hex)
{
var chunks = [];
for (var i = 0, charsLength = hex.length; i < charsLength; i += 2) {
dec = parseInt(hex.substring(i, i + 2),16);
chunks.push(dec);
}
return chunks.join('.');
}
</script>
</head>
<body>
<form id="frm1">
<textarea id="code" rows="20" cols="200"></textarea>
</form>
<button onclick="myFunction()">Extract IP</button>
<p id="output"></p>
<script>
function myFunction() {
var x = document.getElementById("code");
var text = x.value; //get the initial payload
text = findb64(text); //look for base64 encoded gzipped data
text = atob(text); //decode data
//few lines to gunzip data
var charData = text.split('').map(function(x){return x.charCodeAt(0);});
var binData = new Uint8Array(charData);
var data = pako.inflate(binData);
text = String.fromCharCode.apply(null, new Uint16Array(data));
text = findb64(text); //look for base64 encoded shellcode in unzipped data
text = atob(text); //decode data
text = ascii_to_hex(text); //convert data to hex
var extracted = findIOC(text);
if (extracted.length != 2)
{
console.log(extracted);
text = "Unfortunatelly could not extract IP and port from provided payload. Try to do it manually.";
}
else
{
text = "IP: "+hex_to_ip(extracted[0])+"<br>Port: "+parseInt(extracted[1],16);
}
document.getElementById("output").innerHTML = text;
}
</script>
</body>
</html>
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