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-
-
- FOR OFFICIAL DEPARTMENT OF ENERGY USE ONLY
- ________________________________________________________________________
- THE COMPUTER INCIDENT ADVISORY CAPABILITY
-
- CIAC
-
- INFORMATION BULLETIN
- ________________________________________________________________________
-
- Information about a trojan horse in Norton Utilities for IBM
- PCs and clones
-
- November 7, 1989, 1730 PST Number A-6
-
-
- CIAC has been informed that a trojan horse has been found in a number
- of IBM PCs and PC clones which run Norton Computing utilities. This
- trojan horse appears superficially to be a legitimate file within
- Norton Utilities named either NORTSTOP.ZIP or NORTSHOT.ZIP. (The file
- contents are the same, regardless of the name used.) The trojan horse
- program must be run (i.e., the EXE file for the program must be
- executed) for any damage to occur to your system. If run, the program
- lists the directory and displays a message that one's machine is free
- of viruses. Damage resulting from running this program occurs only if
- the trojan horse program is executed between December 24 and December
- 31 inclusive. In this case, the program will erase files with
- selected file extensions.
-
- Detection
-
- You can detect this trojan horse by using Norton Utilities to examine
- the .EXE file for either of the.ZIP files listed above. The EXE file
- will contain the following message:
-
- The Norton Public Domain Virus Utility, PD Edition 5.50, (C) 1989
- Peter Norton
-
- Your System has been infected with a Christmas virus! Selected
- files were just eliminated! Without these files, you might as well
- use your computer as a damn, boat anchor! If you do NOT own a
- boat, you may want to replace the files which were just erased.
- Try to determine which files they were. HARDY HA! HA! HA! HOW
- DO YOU FEEL NOW; YOU IDIOT? MERRY CHRISTMAS AND HAPPY NEW YEAR!
-
- If your system has the trojan horse, you will obtain a report similar
- to the following when using PKUNZIP (a utility which separates and
- decompresses files):
-
- 1065 Implode 650 39% 10-04-89 12:26 9778978d --w READ-ME.NOW
- 38907 Implode 30156 23% 10-02-89 11:57 c333dec0 --w NORTSHOT.EXE
- ----- ------ ----- ---------------
- 39972 30806 23% 2
-
-
- Eradication
-
- If you should discover this trojan horse, do not execute the file
- NORTSHOT.EXE. Please make a copy of the bogus .EXE and .ZIP files on
- a diskette before you do anything else. Eradicating the NORTSTOP.ZIP
- and NORTSHOT.ZIP trojan horse is straightforward; simply use your disk
- operating system to delete all files named NORTSHOT.EXE and the .ZIP
- file that created it. Please then send the diskette to CIAC at the
- address below as soon as possible.
-
- Note
-
- According to information provided to CIAC, this trojan horse is not
- found in the version of Norton Utilities sold in commercial software
- outlets. It is only found in versions of Norton Utilities available
- from public sources (e.g., bulletin boards).
-
- NORTSTOP.ZIP and NORTSHOT.ZIP are not viruses. They will not
- replicate themselves and spread from machine to machine. One you have
- removed this trojan horse, it can only be reintroduced by copying the
- files once again from public sources.
-
- To send copies of the trojan horse, or to obtain further information
- about this problem, please contact:
-
- Tom Longstaff, CIAC
- Lawrence Livermore National Laboratory
- P.O. Box 808, L-540
- Livermore, CA 94550
- (415) 423-4416 or FTS 543-4416
-
- Send electronic mail to: ciac@tiger.llnl.gov
-
- CIAC FAX: (415) 422-4294 FTS 532-4294
-
-