Home » Archimedes archive » Archimedes World » AW-1993-01.adf » AWJan93 » !AWJan93/Goodies/ModVir/!Help
!AWJan93/Goodies/ModVir/!Help
This website contains an archive of files for the Acorn Electron, BBC Micro, Acorn Archimedes, Commodore 16 and Commodore 64 computers, which Dominic Ford has rescued from his private collection of floppy disks and cassettes.
Some of these files were originally commercial releases in the 1980s and 1990s, but they are now widely available online. I assume that copyright over them is no longer being asserted. If you own the copyright and would like files to be removed, please contact me.
| Tape/disk: | Home » Archimedes archive » Archimedes World » AW-1993-01.adf » AWJan93 |
| Filename: | !AWJan93/Goodies/ModVir/!Help |
| Read OK: | ✔ |
| File size: | 06F2 bytes |
| Load address: | 0000 |
| Exec address: | 0000 |
File contents
Program : !FixVirMod
Version : 1.00 (8th September 1992)
Author : Carl Shaw
Purpose : Removes "6th September" Virus
(C) Archimedes World 1992
This application allows the user to scan a disc to see if any of the modules
have been affected by the "6th September" virus. This virus displays a
harmless but very annoying message after the 6th September.
The virus spreads to relocatable modules (such as those in the !System
application) by redirecting the initialisation, finalisation and service
call offsets to point to its own routines (control is passed back to the
original routines after it has done its work, making it hard to detect by
making the routines transparent).
!FixVirMod will check all modules to make such that they don't contain this
virus and if they do, it will reinstate the offsets to their original values
and remove the offending code from the end of the module.
The desktop interface is very simple, allowing the user to specify the ADFS
drive or even the filing system. The process of scanning a disc for viruses
can be interrupted at any stage by clicking on "Abort".
Modules greater than 300K will not be loaded in by the program and the
message "** NO ROOM ** will be displayed in the "Reparing :" icon box, but
it is rare to find a module this size anyway. More memory could be
allocated by changing the WIMPSLOT command in the !Run file and then
changing the variable BufferSize% in the BASIC program !RunImage.
It should be noted that running this program will clear all RAM based
relocatable modules as a precaution.
00000000 0a 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 |. | 00000010 20 20 20 20 20 20 20 20 20 20 20 20 20 20 50 72 | Pr| 00000020 6f 67 72 61 6d 20 3a 20 21 46 69 78 56 69 72 4d |ogram : !FixVirM| 00000030 6f 64 0a 0a 20 20 20 20 20 20 20 20 20 20 20 20 |od.. | 00000040 20 20 20 20 20 20 20 20 20 56 65 72 73 69 6f 6e | Version| 00000050 20 3a 20 31 2e 30 30 20 28 38 74 68 20 53 65 70 | : 1.00 (8th Sep| 00000060 74 65 6d 62 65 72 20 31 39 39 32 29 0a 20 20 20 |tember 1992). | 00000070 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | 00000080 20 20 20 20 20 20 20 20 20 20 20 0a 20 20 20 20 | . | 00000090 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | 000000a0 20 20 20 20 20 20 20 20 20 20 41 75 74 68 6f 72 | Author| 000000b0 20 20 3a 20 43 61 72 6c 20 53 68 61 77 0a 20 20 | : Carl Shaw. | 000000c0 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | 000000d0 20 20 0a 20 20 20 20 20 20 20 20 20 20 20 20 20 | . | 000000e0 20 20 20 20 20 20 50 75 72 70 6f 73 65 20 3a 20 | Purpose : | 000000f0 52 65 6d 6f 76 65 73 20 22 36 74 68 20 53 65 70 |Removes "6th Sep| 00000100 74 65 6d 62 65 72 22 20 56 69 72 75 73 0a 20 20 |tember" Virus. | 00000110 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | 00000120 20 20 20 20 20 20 20 20 20 0a 20 20 20 20 20 20 | . | 00000130 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | 00000140 20 20 20 20 20 28 43 29 20 41 72 63 68 69 6d 65 | (C) Archime| 00000150 64 65 73 20 57 6f 72 6c 64 20 31 39 39 32 0a 0a |des World 1992..| 00000160 0a 0a 54 68 69 73 20 61 70 70 6c 69 63 61 74 69 |..This applicati| 00000170 6f 6e 20 61 6c 6c 6f 77 73 20 74 68 65 20 75 73 |on allows the us| 00000180 65 72 20 74 6f 20 73 63 61 6e 20 61 20 64 69 73 |er to scan a dis| 00000190 63 20 74 6f 20 73 65 65 20 69 66 20 61 6e 79 20 |c to see if any | 000001a0 6f 66 20 74 68 65 20 6d 6f 64 75 6c 65 73 0a 68 |of the modules.h| 000001b0 61 76 65 20 62 65 65 6e 20 61 66 66 65 63 74 65 |ave been affecte| 000001c0 64 20 62 79 20 74 68 65 20 22 36 74 68 20 53 65 |d by the "6th Se| 000001d0 70 74 65 6d 62 65 72 22 20 76 69 72 75 73 2e 20 |ptember" virus. | 000001e0 20 54 68 69 73 20 76 69 72 75 73 20 64 69 73 70 | This virus disp| 000001f0 6c 61 79 73 20 61 0a 68 61 72 6d 6c 65 73 73 20 |lays a.harmless | 00000200 62 75 74 20 76 65 72 79 20 61 6e 6e 6f 79 69 6e |but very annoyin| 00000210 67 20 6d 65 73 73 61 67 65 20 61 66 74 65 72 20 |g message after | 00000220 74 68 65 20 36 74 68 20 53 65 70 74 65 6d 62 65 |the 6th Septembe| 00000230 72 2e 0a 20 20 54 68 65 20 76 69 72 75 73 20 73 |r.. The virus s| 00000240 70 72 65 61 64 73 20 74 6f 20 72 65 6c 6f 63 61 |preads to reloca| 00000250 74 61 62 6c 65 20 6d 6f 64 75 6c 65 73 20 28 73 |table modules (s| 00000260 75 63 68 20 61 73 20 74 68 6f 73 65 20 69 6e 20 |uch as those in | 00000270 74 68 65 20 21 53 79 73 74 65 6d 0a 61 70 70 6c |the !System.appl| 00000280 69 63 61 74 69 6f 6e 29 20 62 79 20 72 65 64 69 |ication) by redi| 00000290 72 65 63 74 69 6e 67 20 74 68 65 20 69 6e 69 74 |recting the init| 000002a0 69 61 6c 69 73 61 74 69 6f 6e 2c 20 66 69 6e 61 |ialisation, fina| 000002b0 6c 69 73 61 74 69 6f 6e 20 61 6e 64 20 73 65 72 |lisation and ser| 000002c0 76 69 63 65 0a 63 61 6c 6c 20 6f 66 66 73 65 74 |vice.call offset| 000002d0 73 20 74 6f 20 70 6f 69 6e 74 20 74 6f 20 69 74 |s to point to it| 000002e0 73 20 6f 77 6e 20 72 6f 75 74 69 6e 65 73 20 28 |s own routines (| 000002f0 63 6f 6e 74 72 6f 6c 20 69 73 20 70 61 73 73 65 |control is passe| 00000300 64 20 62 61 63 6b 20 74 6f 20 74 68 65 0a 6f 72 |d back to the.or| 00000310 69 67 69 6e 61 6c 20 72 6f 75 74 69 6e 65 73 20 |iginal routines | 00000320 61 66 74 65 72 20 69 74 20 68 61 73 20 64 6f 6e |after it has don| 00000330 65 20 69 74 73 20 77 6f 72 6b 2c 20 6d 61 6b 69 |e its work, maki| 00000340 6e 67 20 69 74 20 68 61 72 64 20 74 6f 20 64 65 |ng it hard to de| 00000350 74 65 63 74 20 62 79 0a 6d 61 6b 69 6e 67 20 74 |tect by.making t| 00000360 68 65 20 72 6f 75 74 69 6e 65 73 20 74 72 61 6e |he routines tran| 00000370 73 70 61 72 65 6e 74 29 2e 0a 0a 21 46 69 78 56 |sparent)...!FixV| 00000380 69 72 4d 6f 64 20 77 69 6c 6c 20 63 68 65 63 6b |irMod will check| 00000390 20 61 6c 6c 20 6d 6f 64 75 6c 65 73 20 74 6f 20 | all modules to | 000003a0 6d 61 6b 65 20 73 75 63 68 20 74 68 61 74 20 74 |make such that t| 000003b0 68 65 79 20 64 6f 6e 27 74 20 63 6f 6e 74 61 69 |hey don't contai| 000003c0 6e 20 74 68 69 73 0a 76 69 72 75 73 20 61 6e 64 |n this.virus and| 000003d0 20 69 66 20 74 68 65 79 20 64 6f 2c 20 69 74 20 | if they do, it | 000003e0 77 69 6c 6c 20 72 65 69 6e 73 74 61 74 65 20 74 |will reinstate t| 000003f0 68 65 20 6f 66 66 73 65 74 73 20 74 6f 20 74 68 |he offsets to th| 00000400 65 69 72 20 6f 72 69 67 69 6e 61 6c 20 76 61 6c |eir original val| 00000410 75 65 73 0a 61 6e 64 20 72 65 6d 6f 76 65 20 74 |ues.and remove t| 00000420 68 65 20 6f 66 66 65 6e 64 69 6e 67 20 63 6f 64 |he offending cod| 00000430 65 20 66 72 6f 6d 20 74 68 65 20 65 6e 64 20 6f |e from the end o| 00000440 66 20 74 68 65 20 6d 6f 64 75 6c 65 2e 0a 0a 54 |f the module...T| 00000450 68 65 20 64 65 73 6b 74 6f 70 20 69 6e 74 65 72 |he desktop inter| 00000460 66 61 63 65 20 69 73 20 76 65 72 79 20 73 69 6d |face is very sim| 00000470 70 6c 65 2c 20 61 6c 6c 6f 77 69 6e 67 20 74 68 |ple, allowing th| 00000480 65 20 75 73 65 72 20 74 6f 20 73 70 65 63 69 66 |e user to specif| 00000490 79 20 74 68 65 20 41 44 46 53 0a 64 72 69 76 65 |y the ADFS.drive| 000004a0 20 6f 72 20 65 76 65 6e 20 74 68 65 20 66 69 6c | or even the fil| 000004b0 69 6e 67 20 73 79 73 74 65 6d 2e 20 20 54 68 65 |ing system. The| 000004c0 20 70 72 6f 63 65 73 73 20 6f 66 20 73 63 61 6e | process of scan| 000004d0 6e 69 6e 67 20 61 20 64 69 73 63 20 66 6f 72 20 |ning a disc for | 000004e0 76 69 72 75 73 65 73 0a 63 61 6e 20 62 65 20 69 |viruses.can be i| 000004f0 6e 74 65 72 72 75 70 74 65 64 20 61 74 20 61 6e |nterrupted at an| 00000500 79 20 73 74 61 67 65 20 62 79 20 63 6c 69 63 6b |y stage by click| 00000510 69 6e 67 20 6f 6e 20 22 41 62 6f 72 74 22 2e 0a |ing on "Abort"..| 00000520 0a 4d 6f 64 75 6c 65 73 20 67 72 65 61 74 65 72 |.Modules greater| 00000530 20 74 68 61 6e 20 33 30 30 4b 20 77 69 6c 6c 20 | than 300K will | 00000540 6e 6f 74 20 62 65 20 6c 6f 61 64 65 64 20 69 6e |not be loaded in| 00000550 20 62 79 20 74 68 65 20 70 72 6f 67 72 61 6d 20 | by the program | 00000560 61 6e 64 20 74 68 65 0a 6d 65 73 73 61 67 65 20 |and the.message | 00000570 22 2a 2a 20 4e 4f 20 52 4f 4f 4d 20 2a 2a 20 77 |"** NO ROOM ** w| 00000580 69 6c 6c 20 62 65 20 64 69 73 70 6c 61 79 65 64 |ill be displayed| 00000590 20 69 6e 20 74 68 65 20 22 52 65 70 61 72 69 6e | in the "Reparin| 000005a0 67 20 3a 22 20 69 63 6f 6e 20 62 6f 78 2c 20 62 |g :" icon box, b| 000005b0 75 74 0a 69 74 20 69 73 20 72 61 72 65 20 74 6f |ut.it is rare to| 000005c0 20 66 69 6e 64 20 61 20 6d 6f 64 75 6c 65 20 74 | find a module t| 000005d0 68 69 73 20 73 69 7a 65 20 61 6e 79 77 61 79 2e |his size anyway.| 000005e0 20 20 4d 6f 72 65 20 6d 65 6d 6f 72 79 20 63 6f | More memory co| 000005f0 75 6c 64 20 62 65 0a 61 6c 6c 6f 63 61 74 65 64 |uld be.allocated| 00000600 20 62 79 20 63 68 61 6e 67 69 6e 67 20 74 68 65 | by changing the| 00000610 20 57 49 4d 50 53 4c 4f 54 20 63 6f 6d 6d 61 6e | WIMPSLOT comman| 00000620 64 20 69 6e 20 74 68 65 20 21 52 75 6e 20 66 69 |d in the !Run fi| 00000630 6c 65 20 61 6e 64 20 74 68 65 6e 0a 63 68 61 6e |le and then.chan| 00000640 67 69 6e 67 20 74 68 65 20 76 61 72 69 61 62 6c |ging the variabl| 00000650 65 20 42 75 66 66 65 72 53 69 7a 65 25 20 69 6e |e BufferSize% in| 00000660 20 74 68 65 20 42 41 53 49 43 20 70 72 6f 67 72 | the BASIC progr| 00000670 61 6d 20 21 52 75 6e 49 6d 61 67 65 2e 20 0a 0a |am !RunImage. ..| 00000680 49 74 20 73 68 6f 75 6c 64 20 62 65 20 6e 6f 74 |It should be not| 00000690 65 64 20 74 68 61 74 20 72 75 6e 6e 69 6e 67 20 |ed that running | 000006a0 74 68 69 73 20 70 72 6f 67 72 61 6d 20 77 69 6c |this program wil| 000006b0 6c 20 63 6c 65 61 72 20 61 6c 6c 20 52 41 4d 20 |l clear all RAM | 000006c0 62 61 73 65 64 0a 72 65 6c 6f 63 61 74 61 62 6c |based.relocatabl| 000006d0 65 20 6d 6f 64 75 6c 65 73 20 61 73 20 61 20 70 |e modules as a p| 000006e0 72 65 63 61 75 74 69 6f 6e 2e 0a 0a 0a 0a 0a 0a |recaution.......| 000006f0 0a 0a |..| 000006f2
.