How To Write A Virus Program By Derick Barthelot
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609/921-1994
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HOW TO WRITE A VIRUS PROGRAM by The Cheshire Cat
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!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! For people who have nothing else to do but cause unprecidented havoc on other peoples systems, this is something you should read. To begin with, I'd like to explain briefly to the ignorant readers of this, what exactly a virus program is. A virus program is in the genre of tapeworm, leech, and other such nasty programs. I will show clearly, one possible application of it, on an Apple system, and I will demonstrate how easily this little pest could lead to wiping out most of someone's important disks. Here we go! One day, while I had little else to do, I was reading an computing article in some obscure science magazine. As it happened, the article discussed a growing problem in the computer community about the danger of virus programs. Someone quoted in the article said that they wrote a very simple virus program and put it on the univerisity computer as a test. All the program did was look through the computers memory, and devices (tape drives, hard drives, etc...) for stored programs, and when it found one, it would search through the program for itself. If it didn't find anything, it would find an empty spot in the program, and implant itself. This may not sound too exciting, but this little program was actually part of another program (maybe a word processor, or spreadsheet, or maybe even zaxxon) and whenever someone ran that program, and executed the little virus stuck inside it, the virus would stop program execution (for a time period that even us humans wouldn't notice) and do its little job of infecting other programs with itself. This example of a virus was harmless, but even so, after only 4 hours the whole system had to be shutdown and the whole memory core dumped because the virus had begun to fill up too much space and it was using up all the mainframe's time. I don't think it would have been so easy if this professor had just done this experiment on his own and had not got permission or told anyone about it. Think of the havoc!! Well, that has taken up too much time discussing already, so I'll add only one more thing before we get down to business, that REAL viruses are extemely BAD. They usually are designed as time bombs that start erasing disks, memory, and maybe even backups or the operating system after they have been run so many times, or after a certain date is reached. Someone did this to a bank one time (and by the way he was never caught!) He was given the task of designing their operating system and security, and he decided he wasn't getting paid enough, so he devised his own method of compensation. Every so often, the computer would steal a certain amount of money from the bank (by just CREATING it electronically) and would put it in an account that didn't exist as far as the bank or the IRS or anybody knew, and whenever this guy wanted, he went to the bank and withdrew some money. They aren't sure how he did it, but
he probably visited the electronic teller as often as possible. As I said, the authorities still haven't found him, but after several years of his leech program being in service, it "expired." They assume that he set it up to destroy itself after so long, and when this little program was gone, the bank suddenly was missing several million dollars. Now, I wouldn't recommend doing this sort of thing, but then again, who said crime doesn't pay? Now to discuss the application of this to a Personal Computer is very simple. When I decided to do this, I figured it would be easiest to stick my program in the DOS, so that I would always know where to put another copy of my virus while it was reproducing itself, and that it would be easier to explain why the disk drive is running when it starts to initialize your disks. For those who have a copy of Beneath Apple DOS it would be easy to find the space to put in the program. If you don't, I tell you a few places that are not used (or where you can put it and it won't be noticed) but I'd recommend getting the book anyways - it's an excellent tool for doing these sort of things, and useful even if you don't. As suggestions for where to put it (if you choose to infect DOS), you could use BCDF-BCFF which is still unused, or BFD9-BFFF, which WAS unused, but has since been used in updates of DOS. Likewise, I would also suggest using space taken up by junk like LOCK or UNLOCK commands. Who the hell ever uses them? Think about it, when was the last time you used the lock command? Get real. If you don't like that, how about MAXFILES. I've only used that in a program once in my entire life. I know people who couldn't even tell you what it does. That would make me feel safe about sticking a virus there. But now comes the part that will be harder for the inexperienced, but easier as long as you know what you're doing. By the way, you've been TOTALLY wasting your time reading this if you don't understand assembly, because you HAVE TO in order to accomplish a task such as this. But, don't fret, you could insert a little BASIC code into some dumb utility (like an program whose only function is to initialize disks) that would put itself on the disk, as it initializes it (probably as the hello program) and would work from that aspect. Of course, it would be easier for a less experienced person to detect, but who really cares! As I was saying, however, you now have to write the code. If you work in an area where you are limited memorywise (like I did) it can get tough at times. The only way I got through it was by referring to documented listings of all of DOS that I got somewhere, and using bits and pieces of routines from other things as much as I could. When I was done, I had a copy of DOS that when it was booted into the computer, would work completely properly (except for maybe some bizarre circumstances that I didn't bother testing for), but when someone CATALOGed a disk, it did a few different things. It would first load up the VTOC as usual, but then it would jump to MY routine. In this instance, it was very easy to use the VTOC which contains many unused bytes to house my counter. I would increment it, check if it was time to destroy the disk, and then execute an INIT, or just save the VTOC. Then it would save three more sectors to the disk. One was the place where DOS branched to my routines, the others were my actual routine. And thus was born a virus. I guarentee that if anyone has experienced a problem with their disks, it was not my fault because I have not yet implemented the virus. No one has pissed me off enough to warrant its use. Even worse is the fact that it could backfire (after being distributed across the country, I don't doubt I'd end up with it also) because not only was it very well planned, but you don't even notice any sort of a pause. The virus executes itself so fast that there is little more than a microsecond of a pause while the catalog is going on. I tried comparing it to a normal
catalog, and found I couldn't tell the difference. The only way this thing wouldn't work is if the disk it was cataloging wasn't DOS 3.3, and if that happened, it would probably screw the disk anyways. I know there are people who will abuse this knowledge, so you may wonder why I even bothered writing it. The fact is that it isn't important to shield people from this knowledge, what is important is for people to know that can be done, and perhaps find a way to prevent it. Just consider what would happen if someone starting putting a virus in a DDD ][.2. First of all, everyone would get a copy of it and use it. Only a few would be that interested to check what these new updates to it were. And perhaps within a month, whenever you tried to unpack a program, it would instead initialize the disk with your file on it. So, like I said, beware of those that would jeapordize themselves and would do such a thing. Of course, I wouldn't hesitate to drop my "bomb" on a few leech friends of mine who don't have modems, but thats a different story. I don't have to worry too much about getting the "cold" back from them. They'll be too screwed up to worry about trading disks. Well, I've said too much already. Please keep my name on this file if you put it on your BBS, ect..., but I don't really care if you want to put your local AE line number, or whatever up at the beginning too, just give me credit where I'm due. Thank-you, and good luck, and, as I said before, be careful out there!! FROM -- THE CHESHIRE CAT written: 12/30/85 =-=-=-= If you need to reach me for more information, try E-mail on =-=-=-= =-=-=-=-=-=-=-=-=-=-= OSB systems (215)-395-1291 =-=-=-=-=-=-=-=-=-=-=-=-==-=-=-= I may offer a listing of my virus's coding if there is =-=-=-=-=-==-=-=-= significant interest. But I leave you now, The Cheshire Cat -=-=-= =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= L5>
609/921-1994
10 Megs/1200/2400>
____________________________________________________________________________
/ | | | \
HOW TO WRITE A VIRUS PROGRAM by The Cheshire Cat
\ | | | /
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! For people who have nothing else to do but cause unprecidented havoc on other peoples systems, this is something you should read. To begin with, I'd like to explain briefly to the ignorant readers of this, what exactly a virus program is. A virus program is in the genre of tapeworm, leech, and other such nasty programs. I will show clearly, one possible application of it, on an Apple system, and I will demonstrate how easily this little pest could lead to wiping out most of someone's important disks. Here we go! One day, while I had little else to do, I was reading an computing article in some obscure science magazine. As it happened, the article discussed a growing problem in the computer community about the danger of virus programs. Someone quoted in the article said that they wrote a very simple virus program and put it on the univerisity computer as a test. All the program did was look through the computers memory, and devices (tape drives, hard drives, etc...) for stored programs, and when it found one, it would search through the program for itself. If it didn't find anything, it would find an empty spot in the program, and implant itself. This may not sound too exciting, but this little program was actually part of another program (maybe a word processor, or spreadsheet, or maybe even zaxxon) and whenever someone ran that program, and executed the little virus stuck inside it, the virus would stop program execution (for a time period that even us humans wouldn't notice) and do its little job of infecting other programs with itself. This example of a virus was harmless, but even so, after only 4 hours the whole system had to be shutdown and the whole memory core dumped because the virus had begun to fill up too much space and it was using up all the mainframe's time. I don't think it would have been so easy if this professor had just done this experiment on his own and had not got permission or told anyone about it. Think of the havoc!! Well, that has taken up too much time discussing already, so I'll add only one more thing before we get down to business, that REAL viruses are extemely BAD. They usually are designed as time bombs that start erasing disks, memory, and maybe even backups or the operating system after they have been run so many times, or after a certain date is reached. Someone did this to a bank one time (and by the way he was never caught!) He was given the task of designing their operating system and security, and he decided he wasn't getting paid enough, so he devised his own method of compensation. Every so often, the computer would steal a certain amount of money from the bank (by just CREATING it electronically) and would put it in an account that didn't exist as far as the bank or the IRS or anybody knew, and whenever this guy wanted, he went to the bank and withdrew some money. They aren't sure how he did it, but
he probably visited the electronic teller as often as possible. As I said, the authorities still haven't found him, but after several years of his leech program being in service, it "expired." They assume that he set it up to destroy itself after so long, and when this little program was gone, the bank suddenly was missing several million dollars. Now, I wouldn't recommend doing this sort of thing, but then again, who said crime doesn't pay? Now to discuss the application of this to a Personal Computer is very simple. When I decided to do this, I figured it would be easiest to stick my program in the DOS, so that I would always know where to put another copy of my virus while it was reproducing itself, and that it would be easier to explain why the disk drive is running when it starts to initialize your disks. For those who have a copy of Beneath Apple DOS it would be easy to find the space to put in the program. If you don't, I tell you a few places that are not used (or where you can put it and it won't be noticed) but I'd recommend getting the book anyways - it's an excellent tool for doing these sort of things, and useful even if you don't. As suggestions for where to put it (if you choose to infect DOS), you could use BCDF-BCFF which is still unused, or BFD9-BFFF, which WAS unused, but has since been used in updates of DOS. Likewise, I would also suggest using space taken up by junk like LOCK or UNLOCK commands. Who the hell ever uses them? Think about it, when was the last time you used the lock command? Get real. If you don't like that, how about MAXFILES. I've only used that in a program once in my entire life. I know people who couldn't even tell you what it does. That would make me feel safe about sticking a virus there. But now comes the part that will be harder for the inexperienced, but easier as long as you know what you're doing. By the way, you've been TOTALLY wasting your time reading this if you don't understand assembly, because you HAVE TO in order to accomplish a task such as this. But, don't fret, you could insert a little BASIC code into some dumb utility (like an program whose only function is to initialize disks) that would put itself on the disk, as it initializes it (probably as the hello program) and would work from that aspect. Of course, it would be easier for a less experienced person to detect, but who really cares! As I was saying, however, you now have to write the code. If you work in an area where you are limited memorywise (like I did) it can get tough at times. The only way I got through it was by referring to documented listings of all of DOS that I got somewhere, and using bits and pieces of routines from other things as much as I could. When I was done, I had a copy of DOS that when it was booted into the computer, would work completely properly (except for maybe some bizarre circumstances that I didn't bother testing for), but when someone CATALOGed a disk, it did a few different things. It would first load up the VTOC as usual, but then it would jump to MY routine. In this instance, it was very easy to use the VTOC which contains many unused bytes to house my counter. I would increment it, check if it was time to destroy the disk, and then execute an INIT, or just save the VTOC. Then it would save three more sectors to the disk. One was the place where DOS branched to my routines, the others were my actual routine. And thus was born a virus. I guarentee that if anyone has experienced a problem with their disks, it was not my fault because I have not yet implemented the virus. No one has pissed me off enough to warrant its use. Even worse is the fact that it could backfire (after being distributed across the country, I don't doubt I'd end up with it also) because not only was it very well planned, but you don't even notice any sort of a pause. The virus executes itself so fast that there is little more than a microsecond of a pause while the catalog is going on. I tried comparing it to a normal
catalog, and found I couldn't tell the difference. The only way this thing wouldn't work is if the disk it was cataloging wasn't DOS 3.3, and if that happened, it would probably screw the disk anyways. I know there are people who will abuse this knowledge, so you may wonder why I even bothered writing it. The fact is that it isn't important to shield people from this knowledge, what is important is for people to know that can be done, and perhaps find a way to prevent it. Just consider what would happen if someone starting putting a virus in a DDD ][.2. First of all, everyone would get a copy of it and use it. Only a few would be that interested to check what these new updates to it were. And perhaps within a month, whenever you tried to unpack a program, it would instead initialize the disk with your file on it. So, like I said, beware of those that would jeapordize themselves and would do such a thing. Of course, I wouldn't hesitate to drop my "bomb" on a few leech friends of mine who don't have modems, but thats a different story. I don't have to worry too much about getting the "cold" back from them. They'll be too screwed up to worry about trading disks. Well, I've said too much already. Please keep my name on this file if you put it on your BBS, ect..., but I don't really care if you want to put your local AE line number, or whatever up at the beginning too, just give me credit where I'm due. Thank-you, and good luck, and, as I said before, be careful out there!! FROM -- THE CHESHIRE CAT written: 12/30/85 =-=-=-= If you need to reach me for more information, try E-mail on =-=-=-= =-=-=-=-=-=-=-=-=-=-= OSB systems (215)-395-1291 =-=-=-=-=-=-=-=-=-=-=-=-==-=-=-= I may offer a listing of my virus's coding if there is =-=-=-=-=-==-=-=-= significant interest. But I leave you now, The Cheshire Cat -=-=-= =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= L5>
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