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- ________________________________________________________________________
- THE COMPUTER INCIDENT ADVISORY CAPABILITY
-
- CIAC
-
- INFORMATION BULLETIN
- ________________________________________________________________________
-
- The MDEF or Garfield Virus on Macintosh Computers
-
-
- May 23, 1990, 1000 PST Number A-25
-
- Summary
-
- A new Macintosh virus called MDEF or the Garfield virus is spreading
- rapidly. This virus is not a variant of the WDEF virus, and should not
- be confused with WDEF. The MDEF virus spreads through system and
- application files, and may cause serious damage to the menu system.
- Disinfectant 1.8, GateKeeper, Virus Detective DA are effective against
- this virus, but Vaccine can cause undesirable side effects.
- _______________________________________________________________________________
-
- Name: MDEF
- Types: Only one known variant
- Platform: Apple Macintosh models 128K and 512K, 512KE, Mac Plus, SE, SE/30, II,
- IIx, IIcx, IIci and IIfx.
- Damage: Possible removal of system menus.
- Symptoms: The virus can cause:
- % both the Macintosh 128K and 512K to crash.
- % system menus to be removed
- Detection/Eradication: Disinfectant 1.8, GateKeeper, Virus Detective DA; others
- should be available shortly.
-
- Critical MDEF Facts
- _______________________________________________________________________________
-
- Introduction
-
- CIAC has learned of a new Macintosh virus called the MDEF or Garfield
- virus. Although its name is similar to WDEF, MDEF is an entirely
- different virus. Currently, the MDEF virus is known to infect the
- Macintosh 128K and 512K, 512KE, Mac Plus, SE, SE/30, II, IIx, IIcx,
- IIci and IIfx. This virus will not spread from 128K or 512K
- Macintoshes, but will cause these models to crash.
-
- MDEF actually refers to one of the resources on Macintosh computers.
- The MDEF virus is so named because this virus infects the MDEF
- resources. If you attempt to detect the MDEF virus using ResEdit or a
- similar tool and discover the MDEF resources, this does not indicate
- that your computer is infected by the MDEF virus.
-
-
- Symptoms
-
- Preliminary indications are that after performing a currently
- unspecified set of actions, the virus will remove itself from the
- system along with the code to control the menu system. This will
- result in the loss of all menus generated by the system. Regardless of
- the particular model of Macintosh computer subject to infections by the
- MDEF virus, this virus infects the system file and applications.
- Typically, the finder and DA handler also become infected. However,
- neither the desktop nor the document files become infected. The MDEF
- virus infects the system file when an infected application is run, and
- infects other applications when they are executed on an infected
- system. On the Macintosh IIci and IIfx, the MDEF virus spreads from
- infected applications to uninfected system files, but does not
- propagate from infected systems to uninfected applications.
-
- Detection and Eradication
-
- Disinfectant 1.8 has recently been released to detect and eradicate the
- MDEF virus. GateKeeper also prevents the MDEF virus from infecting
- the system file. To use the Virus Detective DA, add the following
- search strings:
-
- Resource MDEF & Name "Garfield"
- Resource MDEF & ID = 5378
-
- CAUTION: CIAC has been advised that the use of Vaccine may have an
- undesirable side effect. Vaccine will inform the user that the system
- file has been infected, but is only partially effective in preventing
- this virus from infecting the system file! The system file will be
- damaged as a result of running Vaccine when an application containing
- the MDEF virus is executed.
-
- For additional information or assistance, or to obtain a copy of
- Disinfectant 1.8, please contact CIAC:
-
- Eugene Schultz
- (415) 422-8193 or (FTS) 532-8193
- FAX: (415) 294-5054, (415) 423-0913 or (415) 422-4294
-
- You may also send e-mail to:
-
- ciac@tiger.llnl.gov
-
- Neither the United States Government nor the University of California
- nor any of their employees, makes any warranty, expressed or implied,
- or assumes any legal liability or responsibility for the accuracy,
- completeness, or usefulness of any information, product, or process
- disclosed, or represents that its use would not infringe privately
- owned rights. Reference herein to any specific commercial products,
- process, or service by trade name, trademark manufacturer, or
- otherwise, does not necessarily constitute or imply its endorsement,
- recommendation, or favoring by the United States Government or the
- University of California. The views and opinions of authors expressed
- herein do not necessarily state or reflect those of the United States
- Government nor the University of California, and shall not be used for
- advertising or product endorsement purposes.