As you might have heard from your friends on in news that Flashback Trojan or Malware is infecting a number of Mac OS X users every day, it is becoming an immense threat for your significant data. Since there was no such malware for a long time, Mac users hardly used any anti-virus application to protect their machines against such threats. However, now they are facing serious issues, which include data loss, and need Mac recovery solutions to work around the problem.
What is Flashback Trojan?
It is a malicious program that spreads through web pages and exploits the Java vulnerabilities, which have been a known issue for some time. It prompts an unsuspecting user for your Administrator password. No matter if you provide the password or not, the Malware infects your system and applications. It modifies the content of various web pages, does not let you access various applications and their associated data.
How to check if you are infected with Flashback Trojan?
To check if you are infected by the Trojan, go through the following steps:

• Start Terminal application and run the following commands:
  • defaults read /Applications/Safari.app/Contents/Info LSEnvironment
  • defaults read /Applications/Firefox.app/Contents/Info LSEnvironment
  • defaults read ~/.MacOSX/environment DYLD_INSERT_LIBRARIES
  • If the above commands result in "Default pair does not exist" message, then your system is clean.
  • If the output of the commands is a path of the file where malware is located, then your system is infected by the Malware.

How to remove Flashback Malware?
Use the following Macintosh recovery steps to sort out this issue:

1. Run the below command in the Terminal:

• defaults read /Applications/Safari.app/Contents/Info LSEnvironment

1. Make a note of DYLD_INSERT_LIBRARIES value.
2. In case you encounter the below error message, then proceed to step 8:

1. • "The domain/default pair of (/Applications/Safari.app/Contents/Info, LSEnvironment) does not exist"
2. Else, run below command:
3. • grep -a -o '__ldpath__[ -~]*' %path_obtained_in_step2% 
4. Make a note of output value after the "__ldpath__".
5. Run below command in the Terminal (you should first ensure that you have only one entry from step 2):
6. • sudo defaults delete /Applications/Safari.app/Contents/Info LSEnvironment
   • sudo chmod 644 /Applications/Safari.app/Contents/Info.plist
7. Remove all the files that you got in 2nd and 5th steps.
8. Execute below command in the Terminal:
9. • defaults read ~/.MacOSX/environment DYLD_INSERT_LIBRARIES
10. Note down the output values. In case you got the below error message, it means your system is clean:
11. • "The domain/default pair of (/Users/joe/.MacOSX/environment, DYLD_INSERT_LIBRARIES) does not exist"
12. Else, execute the below command:
13. • grep -a -o '__ldpath__[ -~]*' %path_obtained_in_step9%
14. Note down the entries after "__ldpath__".
15. Execute below commands in the Terminal:
16. • defaults delete ~/.MacOSX/environment DYLD_INSERT_LIBRARIES
    • launchctl unsetenv DYLD_INSERT_LIBRARIES
17. Remove the files that you got in 9th and 11th steps.

You are highly recommended to backup your significant data before applying the above steps as it can lead to severe data loss. If you do not backup data before using the steps and face data loss, then you can use third-party Mac data recovery software.
How to Avoid Flashback Trojan Infection?
You can try out the below methods to avoid Flashback Malware infection, if you are still lucky and are not infected:

• Immediately install the most recent updates released by Apple. The update includes patch for Java vulnerabilities.
• Disable Java in your Mac browsers. Since the problem is caused by Java, you should not turn it on until you get some confirmation that problem is completely fixed.
• Use advanced anti-virus software to avoid the issues in future.

If at any time, you feel that some of your significant files are missing from the Mac hard drive, then you can opt for recovery applications. Such tools are capable of effectively handling all data loss situations.