![]() Do this after the system has been secured, not before. That being done, change all Internet passwords and check all financial accounts for unauthorized transactions. Don't reinstall "Avast," which is worse then useless. Reinstall third-party software from original media or fresh downloads- not from a backup, which may be contaminated. ![]() Don't transfer the Guest account, if it was enabled. Select only users in the Setup Assistant dialog-not Applications, Other files and folders, or Computer & Network Settings. That’s when you transfer the data from a backup in Setup Assistant. When you restart after the installation, you'll be prompted to go through the initial setup process for a new computer. ![]() If you don't already have at least two complete, independent backups of all data, then you must make them first. If you don't know when the attack happened, or if it was too long ago for a complete rollback to be feasible, then you should erase and install OS X. Some of those changes can be restored from a later backup. You will lose all changes to data, such as email, that were made after the time of the snapshot. Obviously, that's only practical if you know when the attack took place, and it was recent, and you have such a backup. The easiest approach is to recover the entire system from a backup that predates the attack. The only way you can be sure that the computer is not compromised is to erase at least the startup volume and restore it to something like the status quo ante. Because of that and some other anomalies in the test results, I recommend a full post-intrusion cleanup. That trojan was thought to have become extinct a few years ago, but you installed it on Feb. You installed what appears to be a variant of the "OpinionSpy" trojan.
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