Are your personal files, such as documents, photos, music does not open normally, their names changed or .aesir added at the end of their name? Then your PC is infected with a new virus from a family of the Locky file-encrypting ransomware like the previous version called Odin, Sh*t and Thor. The main difference is that the new version of Locky virus switched to use the .aesir extension on encrypted files. Once started, it will encrypt all personal files stored on a computer drives and attached network drives.
The new version of Locky uses very strong AES encryption with a huge key. When the ransomware encrypts a file, it will add the .aesir extension to each encrypted file. Once the virus finished enciphering of all files, it will create a file named “-INSTRUCTION.html” with an instructions on how to decrypt all encrypted files.
The Aesir (Locky) virus offers to make a payment in Bitcoins to get the .aesir decryptor and private key to decrypt files. Important to know, currently not possible to decrypt the .aesir files encrypted by this ransomware without the private key and decrypt program, but you can try to restore the encrypted files using a few free utilities.
If you choose to pay the ransom, there is no 100% guarantee that you can get back your files! If you do not want to pay for a decryption key, then you have a chance to restore your files. Use the step-by-step guide below to remove the virus itself and try to restore your files.
Table of Contents
- What is Aesir (Locky) ransomware?
- Is my system infected with Aesir (Locky) ransomware?
- How does my computer get infected with Aesir (Locky) virus ?
- How to decrypt .aesir files ?
- How to remove Aesir (Locky) virus?
- How to restore aesir files ?
- How to prevent my computer from becoming infected by Aesir (Locky) ransomware?
What is Aesir (Locky) ransomware?
The Aesir (Locky) is a new variant of the Locky ransomware infection. It affects all current versions of Windows operating systems such as Windows XP, Windows Vista, Windows 7, Windows 8, Windows 10. This virus uses a hybrid AES + RSA encryption mode to eliminate the possibility of brute force a key, which will allow to decrypt all encrypted files.
When the virus infects a computer, it loads a core file to the system %Temp% folder from the World Wide Web, decodes it and starts using the legitimate Windows program called “rundll32.exe”.
Immediately after the launch, the ransomware scans all available disks, including network and cloud storage, to determine which files will be encrypted. The ransomware uses the file name extension, as a way to define a group of files that will be subjected to encrypting. Encrypted almost all types of files, including common as:
0, .1, .1st, .2bp, .3dm, .3ds, .sql, .mp4, .7z, .rar, .m4a, .wma, .avi, .wmv, .csv, .d3dbsp, .zip, .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, .mov, .vdf, .ztmp, .sis, .sid, .ncf, .menu, .layout, .dmp, .blob, .esm, .vcf, .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, .dba, .rofl, .hkx, .bar, .upk, .das, .iwi, .litemod, .asset, .forge, .ltx, .bsa, .apk, .re4, .sav, .lbf, .slm, .bik, .epk, .rgss3a, .pak, .big, wallet, .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, .dbf, .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, .wav, .wbc, .wbd, .wbk, .wbm, .wbmp, .wbz, .wcf, .wdb, .wdp, .webdoc, .webp, .wgz, .wire, .wm, .wma, .wmd, .wmf, .wmv, .wn, .wot, .wp, .wp4, .wp5, .wp6, .wp7, .wpa, .wpb, .wpd, .wpe, .wpg, .wpl, .wps, .wpt, .wpw, .wri, .ws, .wsc, .wsd, .wsh, .x, .x3d, .x3f, .xar, .xbdoc, .xbplate, .xdb, .xdl, .xld, .xlgc, .xll, .xls, .xlsm, .xlsx, .xmind, .xml, .xmmap, .xpm, .xwp, .xx, .xy3, .xyp, .xyw, .y, .yal, .ybk, .yml, .ysp, .z, .z3d, .zabw, .zdb, .zdc, .zi, .zif, .zip, .zw
Once a file is encrypted, its name will be changed on something like “A3C7VD12D-36AD-8D9CV-SG1A-2Y5A8GT1F0” and appended the .aesir extension. An example, if a file named ‘photo.jpg’, then once encrypted, it will be renamed to ‘A3C7VD12D-36AD-8D9CV-SG1A-2Y5A8GT1F0.aesir’.
In every directory that contains at least one encrypted file, the virus will drop a file named with _0-INSTRUCTION.html or _INSTRUCTION.bmp or _[2 digits]-INSTRUCTION.html. This file contain instructions on how to decrypt all encrypted files. An example of these instructions:
!!! IMPORTANT INFORMATION !!!!
All of your files are encrypted with RSA-2048 and AES-128 ciphers.
More Information about the RSA and AES can be found here:
Decrypting of your files is only possible with the private key and decrypt program
To receive your private key follow one of the links:
If all of this addresses are not available, follow these steps:
1. Download and install Tor Browser:xxx
2. After a successful installation, run the browser and wait for Initialization.
3. Type In the address bar: xxx.
Your persons identificalon ID:
When all users files are encrypted, it will opemn the ransomnote with instructions on How to descrypt .aesir files, or rather, the instructions describes in details on how to pay the ransom to get the ‘aesir decryptor’ and the private key needed to decrypt all files.
This ransomware actively uses scare tactics by giving the victim a brief description of the encryption algorithm and showing a threatening message on the desktop. It is trying to force the user of the infected computer, do not hesitate to pay a ransom, in an attempt to recover encrypted files.
Is my system infected with Aesir (Locky) ransomware?
Identify that your personal computer is infected with Aesir (Locky) ransomware quite easily. If your personal files, such as documents, photos, music does not open normally, that is, for example, when you try to open a document, Word reports that it is an unknown file type, then it is likely that the document is encrypted, and your computer is infected. Of course, the presence on the desktop a ransom screen or threatening message is a sign of infection.
If you suspect that you have opened a email that infected with Aesir (Locky) ransomware, but you does not see any symptoms of the infection, then follow the steps in this guide, see How to remove the Aesir (Locky) virus as soon as possible! Another option, shut down the computer, remove the hard drive and check it on another computer.
How does my computer get infected with Aesir (Locky) virus
Aesir (Locky) virus is distributed through the use of spam emails. Below is an email that is infected with a randomware such as Aesir (Locky) virus.
Once this attachment has been opened, this virus will be started automatically as you do not even notice that. Aesir (Locky) ransomware will start the encryption process. When this process is done, it will display the usual ransom instructions like above on -INSTRUCTION.html.
How to decrypt .aesir files
Currently there is no available method to decrypt aesir files for free. The ransomware repeatedly tells the victim that uses a strong encryption algorithm with 2048-bit key. What does it mean to decrypt the files is impossible without the private key. Use a “brute forcing” method is also not a way because of the big length of the key. Therefore, unfortunately, the only payment to the makers of the Aesir (Locky) ransomware entire amount requested – the only way to try to get the decryption key.
There is absolutely no guarantee that after the payment of the auaesirs of the Aesir (Locky) ransomware will provide the necessary key to decrypt your files. In addition, you must understand that paying money to the cyber criminals, you are encouraging them to create a new virus.
How to remove Aesir (Locky) virus
The following instructions will help you to remove Aesir (Locky) malicious software. Before doing it, you need to know that starting to remove the virus, you may block the ability to decrypt files by paying creators of the virus requested ransom.
Kaspersky Virus Removal Tool and Malwarebytes Anti-malware can detect different types of active ransomware and easily remove it from your computer, but they can not recover encrypted files.
Remove Aesir (Locky) virus with MalwareBytes Anti-malware
Download MalwareBytes Anti-malware (MBAM) from the link below.
Once downloaded, close all programs and windows on your computer. Open a directory in which you saved it. Double-click on the icon that named mbam-setup like below.
When the installation begins, you will see the Setup – Wizard that will help you install MalwareBytes Anti-malware on your computer.
Once installation is complete, you will see window similar to the one below.
Now click on the Scan Now button to start scanning your computer. This procedure can take some time, so please be patient.
When the scan is finished, make sure all entries have “checkmark” and click Remove Selected button. MalwareBytes Anti-malware will start to remove ransoware related files, folders, registry keys. Once disinfection is completed, you may be prompted to Restart.
Remove Aesir (Locky) virus with Kaspersky virus removal tool
Download Kaspersky virus removal tool from here and save it directly to your Windows Desktop.
Double-click on the KVRT icon found on your desktop. Once initialization process is finished, you will see the Kaspersky virus removal tool screen as shown below.
Click Change Parameters and set a check near all your drives. Click OK to close the Parameters window. Next click Start scan button. Kaspersky virus removal tool will now start scanning your computer for known infections. This procedure can take some time, so please be patient.
When KVRT has finished scanning, you will see a screen like shown below.
Click on Continue to start a cleaning process.
How to restore aesir files
In some cases, you can recover files encrypted by ransomware. Try both methods. Important to understand that we cannot guarantee that you will be able to recover all encrypted documents, photos and other files.
Restore aesir files with ShadowExplorer
Download ShadowExplorer from the following link.
Open a directory in which you saved it. Right click to ShadowExplorer-0.9-portable and select Extract all. Follow the prompts. Next please open the ShadowExplorerPortable folder as shown below.
Double click ShadowExplorerPortable to run it. You will see the following screen.
In top left corner, select a Drive and a latest restore point as shown on the example below (1 – drive, 2 – restore point).
On right panel look for a file that you want to restore, right click to it and select Export. An example below.
Restore aesir files with PhotoRec
Download PhotoRec from the link below.
Open a directory in which you saved it. Right click to testdisk-7.0.win and select Extract all. Follow the prompts. Next please open the testdisk-7.0 folder as shown below.
Double click on qphotorec_win to run PhotoRec for Windows. It will open a screen like below.
Select a drive to recover from as shown below.
You will see a list of available partitions. Select a partition that holds the lost and encrypted files. An example below.
Click on File Formats button and select file types to recover. You can to enable or disable the recovery of certain file types. When this is done, click OK button.
Next, click Browse button to select where recovered files should be written, then click Search.
Count of recovered files is updated in real time. All recovered files are written in a folder that you have selected on the previous step. You can to access the files even if the recovery process is not finished.
When the recovery is completed, click on Quit button. Next, open the directory where recovery files are stored. You will see a contents like below.
All recovered files are written in recup_dir.1, recup_dir.2 … sub-directories. If you are looking for a specific file, then you can to sort your recovered files by extension and/or date/time.
How to prevent my computer from becoming infected by Aesir (Locky) ransomware?
Most antivirus programs already have built-in protection system against the ransomware. Therefore, if your computer does not have an antivirus program, make sure you install it. As an extra protection, use the CryptoPrevent.
Download CryptoPrevent from the link below.
Run it and follow the setup wizard. Once the installation is completed, you will be shown a window where you can select a level of protection, as shown in the following example.
Click the Apply button to activate the protection.
Your computer should now be free of the Aesir (Locky) virus infection. If you need help with the instructions, then ask for help here.