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- xThe MBDF Virus
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- The MBDF virus was first discovered in Wales in February, 1992. Several
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- popular Internet archive sites contained some infected games for a short
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- period of time, so a number of people around the world were affected. The
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- games were named “10 Tile Puzzle” and “Obnoxious Tetris.”
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- In addition to these two games, a third game named “Tetricycle” or
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- “tetris-rotating” was a Trojan horse which installed the virus.
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- Two undergraduate students at Cornell University were quickly
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- apprehended shortly after the virus was discovered. They pleaded guilty
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- to charges of second-degree computer tampering for writing and
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- spreading the MBDF virus. They were sentenced to community service and
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- restitution of damages. A third student at Cornell also pleaded guilty to a
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- charge for helping to spread the virus, and was sentenced to community
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- service.
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- Disinfectant identifies both infected files and the Trojan horse as being
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- infected by the MBDF virus. Repairing an infected file removes the virus
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- and returns the file to the state it was in before being infected. Repairing
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- the Trojan horse renders it ineffective and inoperable.
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- The MBDF virus infects both applications and the System file. It also
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- usually infects the Finder and several other system files. The System file
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- is infected as soon as an infected application is run. Other applications
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- become infected as soon as they are run on an infected system.
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- The MBDF virus is non-malicious, but it can cause damage. In particular,
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- the virus takes quite a long time to infect the System file when it first
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- attacks a system. The delay is so long that people often think that their
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- Mac is hung, so they do a restart. Restarting the Mac while the virus is in
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- the process of writing the System file very often results in a damaged
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- System file which cannot be repaired. The only solution in this situation is
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- to reinstall a new System file from scratch.
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- We also have reports that the MBDF virus causes problems with the
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- “BeHierarchic” shareware program, and reports of other menu-related
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- problems on infected systems.
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- The MBDF virus is named after the type of resource it uses to infect files.
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- MBDF resources are a normal part of the Macintosh system, so you should
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- not become alarmed if you see them with ResEdit or some other tool.
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- Special thanks to the people at Claris who included self-check code in their
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- Macintosh software products. Their foresight resulted in an early
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- detection of the virus, and has thus helped the entire Mac community. We
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- strongly encourage other vendors to consider doing the same with their
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- products.
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- There are two known strains of the MBDF virus, MBDF A and MBDF B.
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- There are no significant differences between the two strains.
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