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- From: karyn@cheetah.llnl.gov (Karyn Pichnarczyk)
- Newsgroups: comp.virus
- Subject: CIAC Bulletin C-17: MBDF A on Macintosh (Mac)
-
-
- NO RESTRICTIONS
- _____________________________________________________
- The Computer Incident Advisory Capability
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- _____________________________________________________
- INFORMATION BULLETIN
-
- New Virus on Macintosh Computers: MBDF A
-
- February 25, 1992, 1130 PST Number C-17
-
- ________________________________________________________________________
- NAME: MBDF A virus
- PLATFORM: Macintosh computers-except MacPlus and SE (see below)
- DAMAGE: May cause program crashes
- SYMPTOMS: Claris applications indicate they have been altered; some
- shareware may not work, unexplained system crashes
- DETECTION &
- ERADICATION: Disinfectant 2.6,Gatekeeper 1.2.4, Virex 3.6,
- VirusDetective 5.0.2, Rival 1.1.10, SAM 3.0
- ________________________________________________________________________
- Critical Facts about MBDF A
-
- A new Macintosh virus, MBDF A, (named for the resource it exploits)
- has been discovered. This virus does not appear to maliciously cause
- damage, but simply copies itself from one application to another.
- MBDF A was discovered at two archive sites in newly posted game
- applications, and has a high potential to be very widespread.
-
- Infection Mechanism
-
- This virus is an "implied loader" virus, and it works in a similar
- manner to other implied loader viruses such as CDEF and MDEF. Once
- the virus is active, clean appliacation programs will become infected
- as soon as they are executed. MBDF A infects only applications, and
- does not affect data files. This virus replicates under both System 6
- and System 7. While MBDF A may be present on ALL types of Macintosh
- systems, it will not spread if the infected system is a MacPlus or a
- Mac SE (although it does spread on an SE/30).
-
- Potential Damage
-
- The MBDF A virus has no malicious damaging characteristics, however,
- it may cause programs to inexplicably crash when an item is selected
- from the menu bar. Some programs, such as the shareware
- "BeHierarchic" program, have been reported to not operate correctly
- when infected. Applications written with self-checking code, such as
- those written by the Claris corporation, will inform the user that
- they have been altered.
-
- When MBDF A infects the system file, it must re-write the entire
- system file back to disk; this process may take two or three minutes.
- If the user assumes the system has hung, and reboots the Macintosh
- while this is occuring, the entire system file will be corrupted and
- an entire reload of system software must then be performed.
-
- This virus can be safely eradicated from most infected programs,
- although CIAC recommends that you restore all infected files from an
- uninfected backup.
-
- Detection and Eradication
-
- Because MBDF A has been recently discovered, only anti-viral packages
- updated since February 20, 1992 will locate and eradicate this virus.
- All the major Macintosh anti-viral product vendors are aware of this
- virus and have scheduled updates for their products. These updates
- have all been available since February 24, 1992. The updated versions
- of some products are Disinfectant 2.6, Gatekeeper 1.2.4, Virex 3.6,
- SAM 3.0, VirusDetective 5.0.2, and Rival 1.1.10. Some Macintosh
- applications (such as the Claris software mentioned above) may contain
- self-verification procedures to ensure the program is valid before
- each execution; these programs will note unexpected alterations to
- their code and will inform the user.
-
- MBDF A has been positively identified as present in two shareware
- games distributed by reliable archive sites: "Obnoxious Tetris" and
- "Ten Tile Puzzle". The program "Tetricycle" (sometimes named
- "Tetris-rotating") is a Trojan Horse program which installs the virus.
- If you have downloaded these or any other software since February 14,
- 1992 (the day these programs were loaded to the archive sites), CIAC
- recommends that you acquire an updated version of an anti-viral
- product and scan your system for the existence of MBDF A.
-
- For additional information or assistance, please contact CIAC:
-
- Karyn Pichnarczyk
- (510) 422-1779 or (FTS) 532-1779
- karyn@cheetah.llnl.gov
-
- Call CIAC at (510)422-8193/(FTS)532-8193.
- Send e-mail to ciac@llnl.gov
-
- PLEASE NOTE: Many users outside of the DOE and ESnet computing
- communities receive CIAC bulletins. If you are not part of these
- communities, please contact your agency's response team to report
- incidents. Some of the other teams include the NASA NSI response
- team, DARPA's CERT/CC, NAVCIRT, and the Air Force response team. Your
- agency's team will coordinate with CIAC.
-
- CIAC would like to thank Gene Spafford and John Norstad, who provided
- some of the information used in this bulletin. This document was
- prepared as an account of work sponsored by an agency of the United
- States Government. Neither the United States Government nor the
- University of California nor any of their employees, makes any
- warranty, express or implied, or assumes any legal liability or
- responsibility for the accuracy, completeness, or usefulness of any
- information, apparatus, 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 or
- the University of California, and shall not be used for advertising or
- product endorsement purposes.
-
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