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- Number: E2TH071790U131V36
- Subject: Jerusalem B Virus
- Date: July 24, 1990
- OS Version: All
- Shell Version: All
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-
- GENERAL
- INFORMATION: NetWire Message July 12, 1990
-
- NetWare Users International (NUI), with the support of
- Novell, has conducted tests that have concluded that a variant of a
- Jerusalem B computer virus has been discovered in at least one NetWare user
- site. The virus infects DOS executable files. In order to be exposed to
- the virus, one must import an infected DOS program from the outside.
- NETWARE FILES ARE NOT INFECTED AS THEY SHIP IN THE RED BOX FROM NOVELL.
-
- The virus operates as a TSR. Once an infected program is
- run at a DOS PC, the virus takes residence in the PC memory as a TSR.
- Subsequently, the virus, upon executing any other DOS program on the
- infected PC, will attempt to infect the disk resident copy of that program.
- The infection can occur on local drives as well as network drives, provided
- the workstation has appropriate access rights. Files on network operating
- systems, other than NetWare, could also be infected by this virus. Files
- infected with the virus will show an increase in size of about 1800 bytes.
-
- The real negative effects of the virus will not show until
- certain preprogrammed dates. One confirmed date is July 13, 1990. There
- is a risk that an infected workstation will delete program images on disk
- that are requested for execution on that date. A "Bad command or file
- name" message will result. Under NetWare, the SALVAGE command will restore
- a deleted file if executed properly. If infection is suspect, it is
- recommended that you advance the server system date at the close of the
- working day of July 12, 1990 to July 14, 1990. After the date change, make
- sure that all systems are rebooted before any processing on or off a local
- area network. It is also recommended that professional assistance be
- consulted.
-
- These tests and reports were prompted by a report to NUI.
- Novell and NUI, in their concern for responsible leadership, felt it
- necessary to verify these conditions and notify its users so they could act
- accordingly.
-
- (X) This information was verified by Engineering.
-