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-
- **********************************************************
- * *
- * Make your Turbo C programs self-aware of themselves! *
- * *
- **********************************************************
-
- (C)Copyright 1988, Gilmore Systems
-
- Gilmore Systems
- P.O. Box 3831
- Beverly Hills, CA 90212-0831 U.S.A.
-
- Voice: (213) 275-8006
- Data: (213) 276-5263
-
- Now you can allow your COMPILED Turbo C pgms to check themselves for
- changes in their CRC or filesize, thus detecting if a virus has modified
- them.
-
- Viruses have become a problem - altering *.EXE and *.COM files these
- days. Not just viruses, but hackers who modify shareware programs
- because they don't like looking at the opening screens.
-
- Well, if you're a programmer using Turbo C, you now have a means of
- protection. You can make your programs aware of their own CRC and
- filesize - the 2 most likely things to change in the event of a virus or
- hacker attack.
-
- Enclosed in this archive is this READ.ME file, MAKAWARE.EXE (exe
- initializer), EXAMPLE.C (sample source for using the checker), and 6
- OBJ's - one for each memory model which you can link with your programs
- to offer you (or your program) security. These OBJ's contain the
- function exeaware() as follows:
-
- exeaware(pgmname)
- char *pgmname;
-
- RETURNS: 0 - no changes, file unaltered.
- 1 - CRC changed, file altered.
- 2 - size changed, file altered.
- 3 - both CRC and size changed, file altered.
-
- The passed parameter "pgmname", is the name of your running program.
- For example purposes, you could call the function as follows:
-
- main(argc,argv)
- int argc;
- char **argv;
- {
- extern int exeaware();
- int result;
- ;
- ;
- ;
- result = exeaware(argv[0]); /* this is how to call the function */
- switch(result)
- {
- case 1:
- printf("CRC changed\n");
- break;
- case 2:
- printf("size changed\n");
- break;
- case 3:
- printf("CRC and size changed\n");
- break;
- case 0:
- default:
- printf("No changes\n");
- break;
- }
- ;
- ;
- ;
- }
-
-
- We've included a source file named "example.c" to demonstrate how this
- works. It first calls exeaware() and proves that nothing has been
- altered in the file. It then alters itself by adding a single byte to
- the end of the file and re-calls exeaware(), proving that the CRC and
- size of file has changed.
-
- See the "example.c" file for details on compiling and linking.
-
- To use this code, take note of the memory model you're using and link
- with the appropriate .obj file:
-
- exeawart.obj - tiny model
- exeawarc.obj - compact model
- exeawars.obj - small model
- exeawarm.obj - medium model
- exeawarl.obj - large model
- exeawarh.obj - huge model
-
- See the "example.c" file for details on compiling and linking.
-
- It is a two-step process to enable this code:
-
- First, you must have a call in your main() function to
- exeaware() as shown in the "example.c" source file, and you
- must link with the appropriate memory model.
-
- Second, you must run the program MAKAWARE.EXE against your new
- "exe" file produced by the linker. Again, refer to the
- "example.c" file for instructions.
-
-
- This code offers protection that no external programs can offer. At
- least now, nobody can accuse YOUR program of containing a virus.
- Although nothing's perfect, I'm sure some hacker will come up with a way
- of defeating this code manually, but it would be extremely difficult for
- a virus to alter or defeat this code.
-
- **************************************
- * Register and get the source code *
- **************************************
-
- As with all shareware, try it first. If you like it, send us $10. In
- return for your $10, we'll send you the source code. You'll receive:
-
- EXEAWARE.C - source code needed to reproduce the exeawar?.obj files.
- MAKAWARE.C - source code needed to reproduce the makaware.exe file.
-
- We're not doing anything fancy here. The source code should also work
- with the Microsoft C compiler. The OBJ's that you now have should only
- work with the Turbo C compiler/linker.
-
- If you register for $15 instead of $10, we'll give you 6-months of full
- access to our "Virus Info" BBS in addition to the source code. Our
- "Virus Info" BBS deals strictly with the topic of computer viruses. You
- can download text, source, and programs all pertaining to computer virus
- prevention and detection. A great way to keep informed of the latest
- viruses going around.
-
- You can use your Visa/MC to phone in your order today!
-
- One final note: If you've obtained this archive from a BBS other than
- ours and question the integrity of these .obj's or the makaware.exe
- program within this archive, you can download the CAWARE.ARC file from
- our BBS to be certain nobody 'tinkered' with it. You don't have to be a
- registered user of our BBS to download this file.
-
-
- - Chuck Gilmore
-