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- Date: Fri, 08 Jun 90 10:11:00 +0700
- From: "Tom Erjavec"<TOM.ERJAVEC@UNI-LJ.AC.MAIL.YU> x
- Subject: 1451COM / 1411EXE ? new virus (PC) ?
-
- Here is some (of the rare) news from Yugoslavia:
-
- We have had some 'classical' PC viruses for two years now: 1701,
- 1704, Brain, Bouncing Ball, Jerusalem (1813COM/1808EXE), Yankee
- Doodle like (2885COM/2880EXE), Yankee Doodle (2772COM/2772EXE) and
- Disk Killer. Now it seems we have another uninvited guest.
-
- In early June I was given a sample of a virus, found in a small SW
- engineering company. They detected no strange behaviour but
- prolongation of COM and EXE files. I disassembled it and I'm
- posting a brief report:
-
- VirusName : ?, (1451COM/1411EXE)
- Type : indirect executable code infector
- Infects : COM and EXE files
- VirusBodyLength : 1451 bytes (COM), 1411 bytes (EXE)
- Expanding victim: YES, to paragraph boundary, both COM and EXE
- Location in RAM : before end of memory
- Steals interrupt: 21h
- Intercepts func.: 40h (write to file), 4Bh (load & execute)
- Attacks : Sept., Oct., Nov., Dec., each year
- Action : When executing int 21h, func. 40h (write to file)
- intercepts the call. If triggered the action code
- increments register DX by 0Ah, changing the
- address of buffer to be written to disk.
- Consequences : wrong data (or garbage) written to disk
-
- Program package RETROVIR (c) Proteus detects and removes the
- 1451COM/1411EXE from disk, along with all the other viruses
- mentioned above.
-
- I will be glad to receive reports on this virus from elsewhere.
- Does anyone know its origin?
-
- Tom.
-
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