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VIRUS-L Digest Tuesday, 30 May 1989 Volume 2 : Issue 121 Today's Topics: boot sector vaccine (PC) RE: blown floppy disk (PC) New virus? (PC) Virus writing - crime? Comp.virus Submission Potential nVIR infection (Virus-L v2 i120) (Mac) Macintosh Virus forum now on FIDOnet... Summary of problem posted to VALERT-L (5/19) (Mac) Virus Maker (PC) New Virus for the PC Stop a BOOT virus at BOOT time (PC) [Ed. The moderator is in. Anyone out there considering a vacation - consider the Virgin Islands (imho).] --------------------------------------------------------------------------- Date: Fri, 19 May 89 16:16:01 CDT From: "Rich Winkel UMC Math Department" <MATHRICH@UMCVMB.BITNET> Subject: boot sector vaccine (PC) I liked Mr. Fragakis' idea of filling memory with CLI and HLT instructions, but the offsets in the boot sector which he mentioned seem to be occupied by active code on my DOS 3.3 disk, so I wrote my own patch for 3.3. I used a different method though: when the boot sector gets control, the only other active code in the machine should be ROM code, so ALL the active interrupt vectors should be pointing into ROM. (As far as I can see, INTs are the only way for a boot virus to get periodic, transparent control of the machine, right?) So what the patch does is scan interrupt vectors in the range 0H to 1CH, and 40H, which point to addresses between 0 and C8000. (If such a vector exists when the boot sector gets control, the machine is infected) If it finds such a vector, it prints the message VIRUS ALERT!! and halts the machine. I had to rearrange some strings in the sector to get things to fit. This has been run on two true blue IBM XT's and seems to work fine. I'd be interested in reports from other machines, particularly the IBM AT, where the bios might set up the vector table differently at bootup. Run the following batch file with a dos 3.3 boot disk in drive A: - -------------------- rem This will patch the boot sector of a dos 3.3 disk to detect rem interrupt redirection for interrupts 0H through 1CH, and 40H. pause Be sure you have an IBM DOS 3.3 bootable diskette in A: and ... debug < %0.bat >nul goto end L 7C00 0 0 1 A 7C00 JMP 7DC0 ; JUMP TO VECTOR CHECK ROUTINE FIRST A 7C6C JB 7CC2 ; REDIRECT 'BOOT FAILURE' TO 'DISK BOOT ERR' A 7D0D JB 7CC2 ; DITTO A 7CB5 JMP 7CDA ; BYPASS CHECK FOR 'IBMDOS COM' A 7CAB MOV CX,6 ; REDUCE SCAN FROM 'IBMBIO COM' TO 'IBMBIO' A 7CAE MOV SI,7DBA ; ADJUST POINTER TO NEW POSITION OF 'IBMBIO' E 7D77 'Disk boot error' D A 'Replace and strike a key when ready' 0 E 7DAC 'VIRUS ALERT!!' 0 'IBMBIO' A 7DC0 CLD ; SCAN FORWARD XOR SI,SI MOV DS,SI ; DS:SI = START OF VECTOR TABLE MOV CX,1D ; CHECK FIRST 1DH VECTORS (0H THROUGH 1CH) LODSW ; GET OFFSET MOV BX,AX ; SAVE IT IN BX LODSW ; GET SEGMENT INTO AX OR BX,AX ; ARE THEY BOTH 0? JZ 7DD5 ; IF 0, GET NEXT ONE CMP AX,C800 ; CHECK SEGMENT, IS IT <C800? JB 7DEA ; IF <C800, IT'S BAD. PRINT MSG & LOCK UP LOOP 7DC8 ; BACK TO FIRST 'LODSW' MOV SI,100 ; POINT TO INT 40H LODSW ; GET OFFSET MOV BX,AX ; SAVE IT IN BX LODSW ; GET SEGMENT INTO AX OR BX,AX ; BOTH 0? JZ 7DE7 ; IF 0, ALL'S WELL, CONTINUE WITH BOOT CMP AX,C800 ; NOT 0, IS SEGMENT <C800? JB 7DEA ; YES, IT'S BAD. PRINT MSG & LOCK UP JMP 7C36 ; ALL'S WELL, CONTINUE WITH BOOT MOV SI,7DAC ; POINT TO 'VIRUS ALERT!!' WARNING AND CALL 7D32 ; PRINT IT OUT CLI ; HANG IT UP! HLT W 7C00 0 0 1 Q :end - ----------------------------------- Rich ------------------------------ Date: Sat, 20 May 1989 13:54:11 +0200 From: "UBMJS2::RMEYER" <U0018@DGOGWDG5.BITNET> Subject: RE: blown floppy disk (PC) > I have a 5-1/4" floppy disk under examination for possible virus >damage, and have run into an interesting problem. The disk acts like >it is totally unformatted; neither CHKDSK, RECOVER, the Norton stuff, >or anything else seems to be able to access it. The result of this is >that I cannot see anything about what has happened to the disk. What I >need is a good pd or shareware sector editor that can get at the >absolute sectors w/o trying to read the directory (or else a >reasonably cheap commercial one), although I am not sure that will do >any good, since I cannot write to the disk (no, it is not write >protected) either. The same happens to some of our students every year. If this happens here, it's no virus! The students don't listen to us, if we tell them how to use floppy disks. Everytime someone comes to me with an unreadable floppy, I look (with my eyes) at it and find a fingerprint of the user on the floppy. Maybe you have the same problem Reinhold Meyer Abt. Forstliche Biometrie u. Informatik Buesgenweg 5 D-3400 Goettingen BITNET: U0018@DGOGWDG5 ------------------------------ Date: Sat, 20 May 89 18:00:28 +0300 From: "Yuval Tal (972)-8-474592" <NYYUVAL@WEIZMANN.BITNET> Subject: New virus? (PC) I have worked with a program that uses the graphic mode of my EGA. After some time the picture started to move to all the directions... Did anyone have heared about this virus (if it is one...)? Yuval - ------------------------------------------------------------------------- Yuval Tal Home phone: +972-8-474592 The Weizmann Institute Of Science Rehovot, Israel "Only fools are quoted" - Anonymous - ------------------------------------------------------------------------- Acknowledge-To: <NYYUVAL@WEIZMANN> ------------------------------ Date: Sat, 20 May 89 18:06:35 +0300 From: Nir Zuk <NYZUK@WEIZMANN.BITNET> Subject: Virus writing - crime? I am new on this discussion and i think that the topic that i am discussing have probly discussed before. My question is if virus writing is a crime. I have thought of this question a lot. At the begining i thought that it must be a crime because people write this program in order to erase data to other people but then i thought that if you do not copy diskettes you do not have viruses. Diskette copying is a crime, ofcourse, so virus writing is not a crime because people wouldn't had them unless they copy diskettes. Does any one know the law aspects about this matter? Feel free to answer! ------------------------------ Date: Mon, 22 May 89 08:50:05 EDT From: kweeder@sun.soe.clarkson.edu Subject: Comp.virus Submission Call For Discussion: The Usenet Virus Handbook (With apologies to the mailing list people, please feel free to join in.) With the advent of comp.virus and the establishment of virus tool archives, I think it appropriate to organize a Handbook from information available from the network. The goal I have in mind is to provide a *one-stop* source on what a virus (or trojan horse, etc.) is, how they work and spread, and what can be done to prevent infection and/or cure infections. I don't have the virus guru's who read this group in mind, but rather the average user who needs to be educated if virii and other nasties are ever to be snuffed out. Much of the information to accomplish this is already out there (pointing to the info that Norstad et al. supplies with Disinfectant and the virus 101 series as examples). Thus, what I propose is to form an editor *staff* to accumulate and organize the information and keep it upto date. My current concept is to have a general guide (which sticks to general information) and then a number of supplements each covering a different computing system. This way, an interested party can get the general guide and the particular supplement he/she desires. This information can then be carried in archives for easy access. The get the ball rolling, here are some discussion questions (besides the obvious this is a good/bad idea one): (1) How much information should be provided in the general guide? Many users haven't the slightest idea what is a boot sector or what use is ResEdit. Perhaps the general section should have three chapters: Beginner, Advanced, and a Secret chapter distributed only to trusted individuals (although I suspect the latter one already exists!). (2) How best do we handle duplicate effort? I would like any person who can contribute to participate and I wouldn't want to put anyone in the position of having to decide that X is preferable over Y. We'll need an equitable way to deal deserving people into the action. (3) How do we assemble the editor staff? Certainly, some of the people who are now writing/collection things are natural choices (but it's not my place to volunteer their time). I think we should take volunteers and then settle any races preferably by discussion or by vote. (4) How much staff do we need? One or two for each supplement? One for each general chapter? Should we have a chief editor or two to oversee the whole effort and help to assure that project goals are being met? How about a temporary peer review group to evaluate each section as the guide is being built for the first time? (5) How about a different name for the effort? Since a moderated group isn't the most convienent for this discussion, can anyone suggest a group we could use (invade) to hash-out these details to assemble a formal proposal? I would appreciate some feedback (if you want to comment on my genetic or moral backgroud, fine but please use e-mail :-) ). Jim Kweeder kweeder@sun.soe.clarkson.edu ------------------------------ Date: Mon, 22 May 89 11:52:50 EDT From: dmg@mwunix.mitre.org Subject: Potential nVIR infection (Virus-L v2 i120) (Mac) Sounds more like the disk dropped a few bits rather than a virus infection Gregg. (not =)VIR is a resource added to a Desktop file by Woodhead's Interferon application. It is nothing to worry about. David Gursky Member of the Technical Staff, W-143 Special Projects Department The MITRE Corporation ------------------------------ Date: Mon, 22 May 89 15:28:22 EDT From: dmg@mwunix.mitre.org Subject: Macintosh Virus forum now on FIDOnet... Garner Miller has started a Macintosh Virus forum over FIDOnet called "MacVIR". If you use a FIDOnet BBS, you may wish to ask the Sysop to pick up this conference (I do not believe it is on the FIDO backbone yet; if enough people ask for it though, the backbone will pick it up though). This does not constitute an endorsement of anything or anyone. ------------------------------ From: gateh@conncoll.bitnet Date: Fri, 26 May 89 13:23:39 edt Subject: Summary of problem posted to VALERT-L (5/19) (Mac) I posted to VALERT-L on Friday, May 19, concerning a possible Mac virus problem. First I'd like to thank all those who responded - your suggestions were helpful. At this point I think it is safe to say that my problem was generated by a legitimate disk error, and that there was no virus activity involved. While I still do not understand the events fully, I cannot reproduce any of the activity, and so it would appear that they were isolated and not the result of execution of code. I will, however, keep a close eye on these machines for any indication of unusual activity. If anyone is interested in a more detailed description of my problems, please feel free to write. Once again, thanks for the help. - Gregg *=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=* Gregg TeHennepe | Academic Computing and User Services Minicomputer Specialist | Box 5482 BITNET: gateh@conncoll | Connecticut College Phone: (203) 447-7681 | New London, CT 06320 ------------------------------ Date: Sat, 27 May 89 15:31:03 +0300 From: "Yuval Tal (972)-8-474592" <NYYUVAL@WEIZMANN.BITNET> Subject: Virus Maker (PC) I was shocked when a friend of mine gave me a diskette for the IBM PC which contains a Virus Maker! I examined the program and this is what it does: It knows four types of viruses and then, it asks you to insert a diskette and it will put one of the viruses (the one you tells her), on you diskette. Did anyone see this kind of program before?? I didn't! Yuval Tal - ------------------------------------------------------------------------- Yuval Tal Home phone: +972-8-474592 The Weizmann Institute Of Science Rehovot, Israel "Only fools are quoted" - Anonymous - ------------------------------------------------------------------------- Acknowledge-To: <NYYUVAL@WEIZMANN> ------------------------------ Date: Sat, 27 May 89 15:35:37 +0300 From: "Yuval Tal (972)-8-474592" <NYYUVAL@WEIZMANN.BITNET> Subject: New Virus for the PC Another new virus.... This time as far as i understand it doesn't upload it self on a hard disk but it does load it-self on floppy disks. The thing that you see on the screen it simple....when you work in text mode, every 5 seconds (something like that), one letter falls from the screen and a blank character it written instead of her. I made a small research about this virus and it turned out that the boot record of the diskette with the virus on it, was chnged. The first JMP command in the boot-record was changed to something else. This virus marks track 39 sector 8 as bad (it stores the virus there). Has any-one ever seen or heard of this virus? Yuval Tal - ------------------------------------------------------------------------- Yuval Tal Home phone: +972-8-474592 The Weizmann Institute Of Science Rehovot, Israel "Only fools are quoted" - Anonymous - ------------------------------------------------------------------------- Acknowledge-To: <NYYUVAL@WEIZMANN> ------------------------------ Date: Tue, 30 May 1989 00:39:44 EDT From: Steve <XRAYSROK@SBCCVM.BITNET> Subject: Stop a BOOT virus at BOOT time (PC) I just want to correct my recent comments concerning Stanley Fragakis's alteration of the boot program to stop a boot virus at boot time by overwriting everything in RAM (except the boot program itself). I have actually tried the alterations on a couple floppies and they seem to work fine (i.e. they do not interfere with normal operation of the computer). If the floppy is not a system disk and you try to boot from it, the computer does not die and you do get the standard error message, contrary to my previous comment. Also, the alterations should work fine with system disks (The boot program overwrites memory prior to loading the operating system into memory, so there is no problem). Steven C. Woronick | Disclaimer: These are my own opinions. Physics Dept. | Check it out for yourself! SUNY at Stony Brook | Stony Brook, NY 11794 | Acknowledge-To: <XRAYSROK@SBCCVM> ------------------------------ End of VIRUS-L Digest ********************* Downloaded From P-80 International Information Systems 304-744-2253