|Short Description||Trojan.Cryptolocker.AA locks the user’s important files and demands a payment. From the CryptoLocker family of ransomware|
|Symptoms||Files are locked in a ‘.LOCKED’ file format and a ransom message is displayed. Payment instructions are included in a file.|
|Distribution Method||Distribution method is not clear yet. It may be distributed via unsafe browsing, corrupted attachments, drive-by downloads, malicious apps, etc.|
|Detection tool||Download Advanced anti-malware tool, to See If Your System Has Been Affected By Trojan.Cryptolocker.AA|
|User Experience||Join our forum to follow the discussion about Trojan.Cryptolocker.AA.|
|Data Recovery Tool||Windows Data Recovery by Stellar Phoenix Notice! This product scans your drive sectors to recover lost files and it may not recover 100% of the encrypted files, but only few of them, depending on the situation and whether or not you have reformatted your drive.|
A new ransomware, variant of the notorious CryptoLocker family of Trojans has appeared on the security radar of online threat researchers. It involves the encryption of the user’s important files on his computer after which leaves a ransom note with instructions about how to pay for their unlocking. Even though security experts classify this trojan horse as a low-level type of threat, it can still do damage to your valuable information, this is why a proper anti-malware protection is always good to have around.
Trojan.Cryptolocker.AA – How Did I Get Infected?
One particular strategy cyber criminals use to spread out this trojan is spam email campaigns. They may pose as someone important sending you a business proposition or a company claiming you have won a prize. Some cyber-criminals with higher programming skills and deeper pockets even use spoof mailing software when they make targeted attacks for one machine or several devices on a network. Such spoof emails may be exactly the same as someone inside the network, who is familiar to the user, like a family member, a boss or anybody in his friends/contacts list.
Another method of spreading is by being redirected to a malicious site that downloads the malware as a form of a java or flash player plugin update on the user PC. This is very common for bot viruses on social networks that post videos prompting to download a plugin from an external domain. You can also be redirected if you have a PUP (Potentially Unwanted Program) on your computer.
Trojan.Cryptolocker.AA In Detail
According to Symantec’s report, once activated, this particular trojan may scan for files of the following formats and use different algorithms to prioritize them (ex. how often they are opened by the user, etc.):
→‘.txt .jpg .jpe .gif .png .jpeg .avi .pdf .mp3 .mp4 .ppt .pptx .xls .xlsx .QBB .QBW .QDB .doc .docx .docm .zip .rar .7z .wps .php .ssh .key .psd .tc .dwg .wpd .rtf .raw .pst .wmv .mpeg .mpg .mov .m4v .mkv .vhd .vmdk .vdi .vbox’
After it has selected its targets, this trojan then carefully encrypts them and puts a .LOCKED extension on them, making them inaccessible or ‘corrupt’.
After the user’s files have been ‘.LOCKED’, this Trojan then drops a ransom note in the following Windows directory:
This Trojan horse is also able to collect information about the machine’s type and other info and sent it over to the host’s domain.
Removing Trojan.Cryptolocker.AA from PC
To remove a trojan horse from the computer, you should have at least minimal experience in removing viruses. It is recommended first to back up all the data, both encrypted and non-encrypted that is of relevance to you on an external drive. Then, you should follow these instructions:
1. Start Your PC in Safe Mode to Remove Trojan.Cryptolocker.AA.
For Windows XP, Vista, 7 systems:
1. Remove all CDs and DVDs, and then Restart your PC from the “Start” menu.
– For PCs with a single operating system: Press “F8” repeatedly after the first boot screen shows up during the restart of your computer. In case the Windows logo appears on the screen, you have to repeat the same task again.
– For PCs with multiple operating systems: Тhe arrow keys will help you select the operating system you prefer to start in Safe Mode. Press “F8” just as described for a single operating system.
3. As the “Advanced Boot Options” screen appears, select the Safe Mode option you want using the arrow keys. As you make your selection, press “Enter“.
4. Log on to your computer using your administrator account
While your computer is in Safe Mode, the words “Safe Mode” will appear in all four corners of your screen.
For Windows 8, 8.1 and 10 systems:
Step 1: Open the Start Menu
Step 2: Whilst holding down Shift button, click on Power and then click on Restart.
Step 3: After reboot, the aftermentioned menu will appear. From there you should choose Troubleshoot.
Step 4: You will see the Troubleshoot menu. From this menu you can choose Advanced Options.
Step 5: After the Advanced Options menu appears, click on Startup Settings.
Step 6: Click on Restart.
Step 7: A menu will appear upon reboot. You should choose Safe Mode by pressing its corresponding number and the machine will restart.
2. Remove Trojan.Cryptolocker.AA automatically by downloading an advanced anti-malware program.
To clean your computer you should download an updated anti-malware program on a safe PC and then install it on the affected computer in offline mode. After that you should boot into safe mode and scan your computer to remove all Trojan.Cryptolocker.AA associated objects.
Restore .LOCKED Files
There are several ways to restore encrypted files, depending on the algorithm used by the ransomware. Since this trojan may be from the CryptoLocker family, it most likely employs RSA encryption algorithm.
One way is to use a decryption program for Windows. For more information, check this article.
Another way to decrypt your files is to find the key using software for Ubuntu, called Python and to decrypt it with the cado-nfs program. This is a bit tech-savvy and more costly but is worth a try. If you want to learn how to do it, click here.
IMPORTANT: Bear in mind that if the encryption is stronger (for example above 512 bit) your chances automatically dim down to almost impossible to decrypt. The decryption time may vary from few hours to days and even weeks and months to complete depending on the encryption’s strength.
How To Protect Yourself In the Future?
We have decided to include few friendly advises on protecting yourself from malware and in the future reduce cyber attacks drastically.
Tips to protect yourself from CryptoLocker Trojans
- Make sure to use additional firewall protection. Downloading a second firewall (like ZoneAlarm(HLL) for example) is an excellent solution for any potential intrusions.
- Make sure that your programs have less administrative power over what they read and write on your computer. Make them prompt you admin access before starting.
- Use stronger passwords. Stronger passwords (preferably ones that are not words) are harder to crack by several methods, including brute forcing since it includes pass lists with relevant words.
- Turn off AutoPlay. This protects your computer from malicious executable files on USB sticks or other external memory carriers that are immediately inserted into it.
- Disable File Sharing – it is recommended if you need file sharing between your computer to make it password protect it to restrict the threat only to yourself if infected.
- Switch off any remote services – this can be devastating for business networks since it can cause a lot of damage on a massive scale.
- If you see a service or a process that is external and not Windows critical and is being exploited by hackers (Like Flash Player) disable it until there is an update that fixes the exploit.
- Make sure always to update the critical security patches for your software and OS.
- Configure your mail server to block out and delete suspicious file attachment containing emails.
- If you have a compromised computer in your network, make sure to isolate immediately it by powering it off and disconnecting it by hand from the network.
- Make sure to educate all of the users on the network never to open suspicious file attachments, show them examples.
- Employ a virus-scanning extension in your browser that will scan all the downloaded files on your computer.
- Turn off any non-needed wireless services, like Infrared ports or Bluetooth – hackers love to use them to exploit devices. In case you use Bluetooth, make sure that you monitor all of the unauthorized devices that prompt you to pair with them and decline and investigate any suspicious ones.
- Employ a virus-scanning extension in your browser that will scan all the downloaded files on your computer.
- Employ a powerful anti-malware solution to protect yourself from any future threats automatically.
Also, security engineers recommend that you back up your files immediately, preferably on an external memory carrier in order to be able to restore them. In order to protect yourself from Trojan.Cryptolocker.AA (For Windows Users) please follow these simple instructions:
For Windows 7 and earlier:
1-Click on Windows Start Menu
2-Type Backup And Restore
3-Open it and click on Set Up Backup
4-A window will appear asking you where to set up backup. You should have a flash drive or an external hard drive. Mark it by clicking on it with your mouse then click on Next.
5-On the next window, the system will ask you what do you want to backup. Choose the ‘Let Me Choose’ option and then click on Next.
6-Click on ‘Save settings and run backup’ on the next window in order to protect your files from possible attacks by Trojan.Cryptolocker.AA.
For Windows 8, 8.1 and 10:
1-Press Windows button + R
2-In the window type ‘filehistory’ and press Enter
3-A File History window will appear. Click on ‘Configure file history settings’
4-The configuration menu for File History will appear. Click on ‘Turn On’. After its on, click on Select Drive in order to select the backup drive. It is recommended to choose an external HDD, SSD or a USB stick whose memory capacity is corresponding to the size of the files you want to backup.
5-Select the drive then click on ‘Ok’ in order to set up file backup and protect yourself from Trojan.Cryptolocker.AA.
Enabling Windows Defense Feature:
1- Press Windows button + R keys.
2- A run windows should appear. In it type ‘sysdm.cpl’ and then click on Run.
3- A System Properties windows should appear. In it choose System Protection.
5- Click on Turn on system protection and select the size on the hard disk you want to utilize for system protection.
6- Click on Ok and you should see an indication in Protection settings that the protection from Trojan.Cryptolocker.AA is on.
Restoring a file via Windows Defense feature:
1-Right-click on the encrypted file, then choose Properties.
2-Click on the Previous Versions tab and then mark the last version of the file.
3-Click on Apply and Ok and the file encrypted by Trojan.Cryptolocker.AA should be restored.
Spy Hunter FREE scanner will only detect the threat. If you want the threat to be automatically removed, you need to purchase the full version of the malware tool. Find Out More About SpyHunter Anti-Malware Tool
- Guide 1: How to Remove Trojan.Cryptolocker.AA from Windows.
- Guide 2: Get rid of Trojan.Cryptolocker.AA from Mac OS X.
How to Remove Trojan.Cryptolocker.AA from Windows.
Step 1: Boot Your PC In Safe Mode to isolate and remove Trojan.Cryptolocker.AA
Step 2: Uninstall Trojan.Cryptolocker.AA and related software from Windows
Here is a method in few easy steps that should be able to uninstall most programs. No matter if you are using Windows 10, 8, 7, Vista or XP, those steps will get the job done. Dragging the program or its folder to the recycle bin can be a very bad decision. If you do that, bits and pieces of the program are left behind, and that can lead to unstable work of your PC, errors with the file type associations and other unpleasant activities. The proper way to get a program off your computer is to Uninstall it.
Step 3: Clean any registries, created by Trojan.Cryptolocker.AA on your computer.
The usually targeted registries of Windows machines are the following:
You can access them by opening the Windows registry editor and deleting any values, created by Trojan.Cryptolocker.AA there. This can happen by following the steps underneath:
Step 4: Scan for Trojan.Cryptolocker.AA with SpyHunter Anti-Malware Tool
Step 5 (Optional): Try to Restore Files Encrypted by Trojan.Cryptolocker.AA.
Ransomware infections and Trojan.Cryptolocker.AA aim to encrypt your files using an encryption algorithm which may be very difficult to decrypt. This is why we have suggested a data recovery method that may help you go around direct decryption and try to restore your files. Bear in mind that this method may not be 100% effective but may also help you a little or a lot in different situations.
If the above link does not work for you and your region, try the other two links below, that lead to the same product:
Get rid of Trojan.Cryptolocker.AA from Mac OS X.
Step 1: Uninstall Trojan.Cryptolocker.AA and remove related files and objects
1. Hit the ⇧+⌘+U keys to open Utilities. Another way is to click on “Go” and then click “Utilities”, like the image below shows:
- Go to Finder.
- In the search bar type the name of the app that you want to remove.
- Above the search bar change the two drop down menus to “System Files” and “Are Included” so that you can see all of the files associated with the application you want to remove. Bear in mind that some of the files may not be related to the app so be very careful which files you delete.
- If all of the files are related, hold the ⌘+A buttons to select them and then drive them to “Trash”.
In case you cannot remove Trojan.Cryptolocker.AA via Step 1 above:
In case you cannot find the virus files and objects in your Applications or other places we have shown above, you can manually look for them in the Libraries of your Mac. But before doing this, please read the disclaimer below:
You can repeat the same procedure with the following other Library directories:
Tip: ~ is there on purpose, because it leads to more LaunchAgents.
Step 2: Scan for and remove Trojan.Cryptolocker.AA files from your Mac
When you are facing problems on your Mac as a result of unwanted scripts and programs such as Trojan.Cryptolocker.AA, the recommended way of eliminating the threat is by using an anti-malware program. Combo Cleaner offers advanced security features along with other modules that will improve your Mac’s security and protect it in the future.
Step 3 (Optional): Try to Restore Files Encrypted by Trojan.Cryptolocker.AA on your Mac.
Ransomware for Mac Trojan.Cryptolocker.AA aims to encode all your files using an encryption algorithm which may be very difficult to decode, unless you pay money. This is why we have suggested a data recovery method that may help you go around direct decryption and try to restore your files, but only in some cases. Bear in mind that this method may not be 100% effective but may also help you a little or a lot in different situations.
What is Trojan.Cryptolocker.AA ransomware and how does it work?
Trojan.Cryptolocker.AA is a ransomware infection - the malicious software that enters your computer silently and blocks either access to the computer itself or encrypt your files. Many ransomware viruses use sophisticated encryption algorithm how to make your files inaccessible. The goal of ransomware infections is to demand that you pay a ransom payment to get access to your files back.
How does Trojan.Cryptolocker.AA ransomware infect my computer?
Trojan.Cryptolocker.AA Ransomware infects computers by being sent via phishing e-mails, containing virus attachment. This attachment is usually masked as an important document, like an invoice, bank document or even a plane ticket and it looks very convincing to users. After you download and execute this attachment, a drive-by download occurs and your computer is infected with the ransomware virus.
Another way, you may become a victim of Trojan.Cryptolocker.AA is if you download a fake installer, crack or patch from a low reputation website or if you click on a virus link. Many users report getting a ransomware infection by downloading torrents.
How to open .Trojan.Cryptolocker.AA files?
You can't. At this point the .Trojan.Cryptolocker.AA files are encrypted. You can only open them once they are decrypted.
Decryptor did not decrypt my data. What now?
If a decryptor did not decrypt your .Trojan.Cryptolocker.AA files successfully, then do not despair, because this virus is still new.
One way to restore files, encrypted by Trojan.Cryptolocker.AA ransomware is to use a decryptor for it. But since it's a new virus, advised that the decryption keys for it may not be out yet and available to the public. We will update this article and keep you posted as soon as this decryptor is released.
How Do I restore ".Trojan.Cryptolocker.AA" files (Other Methods)?
We have suggested several file recovery methods that could work if you want to restore .Trojan.Cryptolocker.AA files. These methods are in no way 100% guarantee that you will be able to get your files back. But if you have a backup, your chances of success are much greater.
How do I get rid of Trojan.Cryptolocker.AA ransomware virus?
The safest way and the most efficient one for the removal of this ransomware infection is the use a professional anti malware software. It will scan for and locate Trojan.Cryptolocker.AA ransomware and then remove it without causing any additional harm to your important .Trojan.Cryptolocker.AA files.
Also, keep in mind that viruses like Trojan.Cryptolocker.AA ransomware also install Trojans and keyloggers that can steal your passwords and accounts. Scanning your computer with an anti-malware software will make sure that all of these virus components are removed and your computer is protected in the future.
What to Do If nothing works?
If none of the above methods seem to work for you, then try these methods:
Try to find a safe computer from where you can can login on your own line accounts like One Drive, iDrive, Google Drive and so on.
Try to contact your friends relatives and other people so that they can check if they have some of your important photos or documents just in case you sent them.
Also, check if some of the files that were encrypted it can be re downloaded from the web.
Another clever way to get back some of your files is to find another old computer, a flash drive or even a CD or a DVD where you may have saved your older documents. You might be surprised what will turn up.
You can also go to your email account to check if you can send any attachments to other people. Usually what is sent the email is saved on your account and you can re-download it. But most importantly, make sure that this is done from a safe computer and make sure to remove the virus first.
More tips you can find on our forums, where you can also asks any questions about your ransomware problem.