Flashback Trojan Infection For Mac Through Java: How To Check, Detect And Removal

It’s very rarely do we ever post about Mac in general and especially about any Apple device concerning viruses, but I felt it was my responsibility to alert my readers of the Flashback trojan, how to detect it and how to remove it.

“Over the past few weeks, security experts have warned Mac users of a new virus making its rounds called the “Flashback” trojan. Flashback is allegedly on over 600,000 Macs, which is roughly 1-percent of the 45 million out there. Flashback exploits a pair of vulnerabilities in older versions of Java. Apple may have patched it, but it is still out there and running on many machines.”

This info comes from 9to5Mac. If you go this link, it’ll take you to github to download a zip file which is an exe that if run, will check your Macs for this nasty little virus. If it says you’re free of it, if you’re not, don’t worry. We have some instructions for you to remove it.


Manual RemovalCaution: Manual disinfection is a risky process; it is recommended only for advanced users. Otherwise, please seek professional technical assistance. F-Secure customers may also contact our Support.Manual Removal Instructions

  • 1. Run the following command in Terminal:

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

  • 2. Take note of the value, DYLD_INSERT_LIBRARIES
  • 3. Proceed to step 8 if you got the following error message:

    “The domain/default pair of (/Applications/Safari.app/Contents/Info, LSEnvironment) does not exist”

The rest of the process can be read at f secure. I suggest you take action now because God knows how much, what and when this trojan can further attack your computer. There are rumors that Apple is already working on their own software to remove this infection. Until then, get proactive.

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