Posted 27 February 2015 - 12:00 PM

TeslaCrypt has closed its doors and released the master decrypt key. BloodDolly has already updated his tool so it can now decrypt all files encrypted by TeslaCrypt 3.0 and 4.x. More info here:



http://www.bleepingcomputer.com/news/security/teslacrypt-shuts-down-and-releases-master-decryption-key/

A new ransomware called TeslaCrypt was discovered by Fabian Wosar of Emsisoft that encrypts your files using AES encryption and then demands a ransom payment in order to decrypt your files. What makes TeslaCrypt different than other ransomware is its attempt to cash in on the $81 billion game market by placing a strong emphasis on encrypting video game related files. Unlike other ransomware that typically target images, documents, videos, and applications databases, TeslaCrypt also targets over 40 different video game related files. The game files being targeted belong to games such as RPG Maker, Call of Duty, Dragon Age, StarCraft, MineCraft, World of Warcraft, World of Tanks, and Steam.

Another major difference with this ransomware is that for the first time this type of infection not only accepts bitcoins as a ransom payment, but also accepts PayPal My Cash cards. PayPal My Cash cards are cards that can be purchased at popular US store chains and then filled with money that can then be transferred to a PayPal account using the PIN on the card. Paying the ransom with PayPal My Cash cards, though, comes at a premium of $1,000, while paying the ransom with bitcoins is half that price at $500 USD. This higher price for using the Cash cards is probably due to the higher risk of the illegal gains being confiscated by PayPal.

.7z;.rar;.m4a;.wma;.avi;.wmv;.csv;.d3dbsp;.sc2save;.sie;.sum;.ibank;.t13;.t12;.qdf;.gdb;.tax;.pkpass;.bc6;.bc7;.bkp;.qic;.bkf;.sidn;.sidd;.mddata;.itl;.itdb;.icxs;.hvpl;.hplg;.hkdb;.mdbackup;.syncdb;.gho;.cas;.svg;.map;.wmo;.itm;.sb;.fos;.mcgame;.vdf;.ztmp;.sis;.sid;.ncf;.menu;.layout;.dmp;.blob;.esm;.001;.vtf;.dazip;.fpk;.mlx;.kf;.iwd;.vpk;.tor;.psk;.rim;.w3x;.fsh;.ntl;.arch00;.lvl;.snx;.cfr;.ff;.vpp_pc;.lrf;.m2;.mcmeta;.vfs0;.mpqge;.kdb;.db0;.DayZProfile;.rofl;.hkx;.bar;.upk;.das;.iwi;.litemod;.asset;.forge;.ltx;.bsa;.apk;.re4;.sav;.lbf;.slm;.bik;.epk;.rgss3a;.pak;.big;.unity3d;.wotreplay;.xxx;.desc;.py;.m3u;.flv;.js;.css;.rb;.png;.jpeg;.txt;.p7c;.p7b;.p12;.pfx;.pem;.crt;.cer;.der;.x3f;.srw;.pef;.ptx;.r3d;.rw2;.rwl;.raw;.raf;.orf;.nrw;.mrwref;.mef;.erf;.kdc;.dcr;.cr2;.crw;.bay;.sr2;.srf;.arw;.3fr;.dng;.jpe;.jpg;.cdr;.indd;.ai;.eps;.pdf;.pdd;.psd;.dbfv;.mdf;.wb2;.rtf;.wpd;.dxg;.xf;.dwg;.pst;.accdb;.mdb;.pptm;.pptx;.ppt;.xlk;.xlsb;.xlsm;.xlsx;.xls;.wps;.docm;.docx;.doc;.odb;.odc;.odm;.odp;.ods;.odt;

[b]vssadmin delete shadows /all[/b]

At this point it is unknown as to how TeslaCrypt is distributed, but once a computer is infected it will scan all drives on a computer and encrypt certain file types using AES encryption. Any files that are encrypted will have theextension added to the end of the filename. The file types encrypted by the TeslaCrypt ransomware are:Unlike other ransomware, TeslaCrypt pays peculiar attention to files used by popular games such as Dragon Age, Call of Duty, StarCraft 2, RPG Maker, World of Warcraft, World of Tanks, Minecraft, DayZ, and League of Legends. This targeting of video game related files is a new development in ransomware. Once all of your data has been encrypted, it will run the following command to delete all Shadow Volume Copies and restore points from your computer. This is done so you are unable to restore your data from System Restore Points.Finally, the ransomware will change your Desktop wallpaper to a ransom note and create another ransom note called HELP_TO_DECRYPT_YOUR_FILES.txt on your desktop. A lock screen will then appear that explains your data was encrypted and that you have 3 days to make payment. This lock screen contains buttons that allow you to check whether a payment has been accepted, the ability to enter your decryption keys, and a link to a TOR payment site where you can perform a free file decryption as a test.

TeslaCrypt's TOR site provides instructions on how you can make your ransom payment in bitcoins or PayPal My Cash Cards. The site also allows you to decrypt one file for free to prove that they can indeed decrypt your files. Last, but not least, the site includes a message system that allows a victim to communicate privately with the malware developers.

[b]%AppData%\<random>.exe %AppData%\key.dat %AppData%\log.html %Desktop%\CryptoLocker.lnk %Desktop%\HELP_TO_DECRYPT_YOUR_FILES.bmp %Desktop%\HELP_TO_DECRYPT_YOUR_FILES.txt[/b]

HKCU\Software\Microsoft\Windows\CurrentVersion\Run\crypto13 %AppData%\<random>.exe

Unfortunately, at this time there is no known method of decrypting your files for free. As always we recommend that you do not pay the ransom if you can avoid it. Instead restore files from a backup or try restoring your files using Shadow Explorer or with a file recovery tool like R-Studio, Photorec, or Recuva. None of these restoration methods are guaranteed to work, but it is worth trying as people have reported success with malware like TeslaCrypt in the past.If you have any questions, please feel free to post them here.