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- ┌───────────────────────────────┐
- │ THE VIRUS INFORMER │ FACT: Did you know that there
- │ your weekly virus newsletter │ are over 586 unique viruses,
- │ by Mark E. Bishop edited by │ over 716 variants, and over
- │ Alan Bechtold │ 1302 known viruses?
- └───────────────────────────────┘
-
-
- CHAPTER 3: 'Introducing the NEW Macintosh Virus, T4A, T4B'
-
-
- The following information is in regard to a new Macintosh virus discovered
- June 30, 1992 which causes damage to Apple Macintosh computers. The virus
- is the T4-A, and T4-B. They can alter your boot code, alter/damage your
- Macintosh applications, and could possible spread into your System files.
-
- The information is valid and has been edited. Contributing information
- came from Gene Spafford of Purdue University and Chris Schram of the Home-
- base CVIA BBS.
-
- Virus: T4-A, T4-B Damage: altered boot code; altered/damaged applications
- Spread: possibly significant Systems affected: Apple Macintosh computers. All
- types, but see text.
-
- A new virus has been discovered, in two slightly different strains. These
- were included with the game application GoMoku, versions 2.0 and 2.1. These
- files were posted to the Usenet comp.binaries.mac newsgroup, and uploaded to
- various ftp archives, including the one at sumex-aim.stanford.edu. [Note: the
- game was distributed under a falsified name.
-
- The name used in the posting, and embedded in the game, is that of a
- completely uninvolved person. Please do not use this person's name in
- reference to the virus. The actual virus author is unknown, and probably
- used this person's name as a form of harassment.
-
- When invoked, the virus attempts to alter the System file. This alteration
- attempt will be noticed by the SAM antivirus program (and possibly by
- Gatekeeper, depending on settings). The alert message that is displayed
- indicates that "Disinfectant" is trying to make the alteration -- whether
- Disinfectant is installed on the system or not. This is evidently an attempt
- to fool users into approving the modification attempt, thus allowing the
- virus to infect.
-
- The change to the System file results in alterations to the boot code under
- both Systems 6 and 7. The damage may render some systems unbootable, but
- will usually result in INIT files and System extensions (respectively) not
- loading.
-
- The virus also attempts to modify application files on the system disk.
- These alterations may damage some applications by overwriting portions of the
- programs with the virus code. These damaged applications *cannot* be
- repaired but must be reinstalled from distribution or backup media.
-
- Once installed and active, the virus does not appear to perform any other
- overt damage. At least one version of the virus may print a message when run
- after a certain number of files are infected by it. This message identifies
- the infection as the T4 virus.
-
- [Note: Although this note is unrelated to the T4 virus, we feel it
- appropriate and important to remind Mac users that neither Apple System 7 nor
- 7.0.1 should be used UNMODIFIED because they have the "disappearing folders"
- bug. Users should be sure they have installed the (free) System Tuner 1.1.1
- from Apple on these systems; versions 1.0 and 1.1 of the Tuner are outdated
- or buggy and should not be used.
-
- Tuner 1.1.1 is available from authorized Apple dealers, from many user
- groups, from commercial networks, and on several places on the Internet.
- Also, System 7.0.1 is *not* the same as System 7 with the Tuner installed;
- 7.0.1 is a later release of System 7. System 7.0.1 also needs the update
- installed.]
-
- Authors of all major Macintosh anti-virus tools are planning updates to
- their tools to locate and/or eliminate this virus. Some of these are listed
- below. We recommend that you obtain and run a CURRENT version of AT LEAST
- ONE of these programs.
-
-
- HERE ARE SOME MAC ANTI-VIRUS SOFTWARE PRODUCTS AND THEIR UPDATE INFO:
-
-
- Tool: DISINFECTANT
- Status: Free software (courtesy of Northwestern University and John
- Norstad) Revision to be released: 2.9 Where to find: usual archive sites
- and bulletin boards -- ftp.acns.nwu.edu, sumex-aim.stanford.edu,
- rascal.ics.utexas.edu, AppleLink, America Online,
- CompuServe, Genie, Calvacom, MacNet, Delphi,
- comp.binaries.mac, when available: soon (probably by July 6)
-
-
- Tool: GATEKEEPER
- Status: Free software (courtesy of Chris Johnson)
- Revision to be released: 1.2.6
- Where to find: usual archive sites and bulletin boards --
- microlib.cc.utexas.edu, sumex-aim.stanford.edu,
- rascal.ics.utexas.edu, comp.binaries.mac
- When available: soon
-
-
- Tool: RIVAL
- Status: Commercial software
- Revision to be released: T4 Vaccine, Rival Refresh 1.1.9w
- Where to find it: AppleLink, America Online, Internet, Compuserve.
- When available: Immediately.
-
-
- Tool: SAM (Virus Clinic and Intercept)
- Status: Commercial software
- Revision to be released: ???
- Where to find: CompuServe, America Online, Applelink, Symantec's
- Bulletin Board @ 408-973-9598
- When available: immediately
- Notes: User definition information: Virus Name: T4 Resource type: CODE
- Resource ID: Any 0 Resource size: >= 5600 Search String: Hex
- 2F2EFFD02F2EFFC43F3CA97B486E String offset: >= 714 from end Check value
- should be 'E7FA' if all fields entered correctly
-
-
- Tool: VIREX
- Status: Commercial software
- Revision to be released: 3.82
- Where to find: Microcom, Inc (919) 490-1277
- When available: 6 July 1992
- Comments: Virex 3.82 will detect the virus in any file, and repair
- any file that has not been permanently damaged by the virus. All
- Virex subscribers will automatically be sent an update on
- diskette. All other registered users will receive a notice with
- information to update prior versions to detect T4. The information
- necessary to update immediately is also available on Microcom's
- BBS: (919)419-1602 and on America OnLine.
-
-
- Tool: VIRUSDETECTIVE
- Status: Shareware
- Revision to be released: 5.0.5
- Where to find: Usual bulletin boards will announce a new search string.
- Registered users will also get a mailing
- with the new search string.
- When available: Immediately.
- Comments: search strings are: Resource CODE & Size > 3900 & Pos -1200 &
- WData 3F3CA9CC*31BC4E71 ; For finding T4
-
-
-
- If you discover what you believe to be a virus on your Macintosh system,
- please report it to the vendor/author of your anti-virus software package for
- analysis. Such reports make early, informed warnings like this one possible
- for the rest of the Mac community.
-
- Also, be aware that writing and releasing computer viruses is more than a
- rude and damaging act of vandalism -- it is also a violation of many state
- and Federal laws in the US, and illegal in several other countries. If you
- have information concerning the author of this or any other computer virus,
- please contact any of the anti-virus providers listed above.
-
- Several Mac virus authors have been apprehended thanks to the efforts of
- the Mac user community, and some are awaiting trial for their actions. This
- is yet one more way to help protect you computers.
-
- - end -
-