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- xThe T4 Virus
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- The T4 virus was discovered in several locations around the world in
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- June, 1992.
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- The virus was included in versions 2.0 and 2.1 of the game GoMoku.
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- Copies of this game were posted to the USENET newsgroup
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- comp.binaries.mac and to a number of popular bulletin boards and
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- anonymous FTP archive sites.
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- The game was distributed under a false name. The name used in the
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- posting, and embedded in the game’s about box, is that of a completely
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- uninvolved person. Please do not use this person’s name in reference to
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- the virus. The actual virus author is unknown, and probably used this
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- person’s name as a form of harassment.
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- The virus spreads to other applications and to the Finder. It also attempts
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- to alter the System file.
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- When the virus infects an application, it damages it in such a way that the
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- application cannot be repaired. When you use Disinfectant to attempt to
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- repair an infected application, Disinfectant removes the virus from the
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- file, but leaves the file damaged. You should not attempt to use such a file.
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- Disinfectant issues the following error message:
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- ### This file was damaged by the virus, and it cannot
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- ### be repaired properly. You should delete the file
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- ### and replace it with a known good copy.
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- The change to the System file results in alterations to the startup code
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- under both Systems 6 and 7. Under System 6 and System 7.0, the change
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- results in INIT files and system extensions not loading. Under System
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- 7.0.1, the change may render the system unbootable or cause crashes in
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- unpredictable circumstances. Disinfectant cannot repair this damage to
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- the System file. If the virus damages your System file, you will have to
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- reinstall it.
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- If your system suddenly stops loading INITs and system extensions for no
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- good reason, it is a good indication that you may have been attacked by
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- the T4 virus.
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- The virus masquerades as Disinfectant in an attempt to bypass
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- general-purpose suspicious activity monitors like Gatekeeper. If you see
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- an alert from such an anti-viral tool telling you that “Disinfectant” is
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- trying to make some change to a file, and if Disinfectant is not running, it
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- is a good indication that T4 is attacking your system. The virus also
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- sometimes actually renames files “Disinfectant”.
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- Once installed and active, the virus does not appear to perform any other
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- overt damage. The virus may display the following message:
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- Application is infected with the T4 virus.
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- There are four known strains of the T4 virus: T4-A (contained in GoMoku
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- 2.0), T4-B (contained in GoMoku 2.1), T4-C (discovered in February,
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- 1993), and a version which appears to have been used for testing which
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- we call “T4-beta.” The strains are very similar. The only significant
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- difference is the trigger date. The trigger date for T4-A is August 15,
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- 1992, while the trigger date for T4-B is June 26, 1992. The virus does
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- not do anything before its trigger date. After the trigger date, the virus
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- begins to spread to other files and attempts to alter the System file. The
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- T4-C virus has no trigger date. T4-C begins spreading immediately.
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