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-
- *********************************************
- *** Reports collected and collated by ***
- *** PC-Virus Index ***
- *** with full acknowledgements ***
- *** to the authors ***
- *********************************************
-
-
- STONED variant: EVIL EMPIRE (2 strains)
- ---------------------------------------
-
- Padgett Peterson reports (April 1991):
-
- First reported as a STONED variant examination has produced a
- considerable number of variations from the traditional STONED.
-
- This alert is a result of a disassembly performed on the boot sector
- of an infected floppy. Since the sector containing the display
- message was not included this text is not available, however
- examination indicates that this second sector (trk 0 hd 1 sector 3
- on floppy) contains only text.
-
- Virus Name: EMPIRE
- V Status: New
- Discovery: April, 1991
- Symptoms: Memory reduction, possible floppy failures, Messages
- Origin: Alberta Canada (?)
- Eff. Length: N/A
- Type Code: BPRtS (Boot and Partition table infector - Resident TOM
- - Stealth)
-
- Detection: CHKDSK, F-DISKINF, DISKSECURE
- (SCAN v76C does not pick this up)
-
- Removal: Cold boot from clean, write-protected floppy, replace
- MBR (FD) or Boot Record (Floppy) see text.
-
- General Comments: On first look, the virus appears similar to the
- STONED but There are notable differences: a "cute" at
- the start will throw a researcher off if a standard
- STONED opening is expected. The virus consists of two
- sectors - the first which replaces the MBR on a fixed
- disk and the BR on a floppy, contains the executable
- code. The second sector contains the display message- I
- have not seen this as yet but it is said to refer to
- the USA as the "evil empire" and makes reference to the
- war with Iraq. This sector has a trivial encryption
- scheme to defeat text examination.
-
- When active in a PC, total memory will be reduced by 2048
- bytes (CHKDSK will return 653312 "total bytes memory" on a
- 640k machine)
-
- A "stealth" mechanism is employed by the virus so that an
- examination of the MBR will fail when the virus is active in
- memory since any request for the MBR will be intercepted by the
- virus and the real MBR will be returned. Similarly, any
- attempt to write to the MBR will be changed to a reset by the
- virus.
-
- No message is displayed at boot-up, rather display is a
- function of a trigger based on the real time clock during
- operation.
-
- On a floppy disk the original boot record is stored on track 0
- head 1 sector 2 and the message is stored on the next sector.
- High density floppies may exhibit failures as a result of this.
- Low density floppies with over 80 directory entries may also
- have problems. These can occur even long after the floppy is
- disinfected if the directory is not restored.
-
- The original MBR on a fixed disk is stored on cyl 0 head 0
- sector 6 with the message on the next sector. Normally, this
- should be in the "hidden sector" area but a disk without
- "hidden sectors" will probably experience FAT failures.
-
- Signature scanning should reveal the virus when booted from a
- clean floppy disk using the string "A3 08 7C A1 13 04 48".
-
-
- Message (encrypted) reads:
-
- "I'm becoming a little confused as to where the "evil empire" is
- these days.
-
- If we paid attention, if we cared, we would realize just how
- unethical this impending war with Iraq is, and how impure the
- American motives are for wanting to force it.
-
- It is ironic that when Iran held American hostages, for a few lives
- the Americans were willing to drag negotiation on for months; yet
- when oil is held hostage, they are willing to sacrifice hundreds of
- thousands of lives, and refuse to negotiate ......"
-
- It is believed to be a modified version of a quote by Ron Kovick, a
- spokesman for Vietnam veterans.
-
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