the giant black book of computer viruses phần 4 potx
the giant black book of computer viruses phần 4 potx
... writes. First, DEVIRUS finds the end of the host file and usesthat as the offset for the new STRAT routine, writing this value into the header. Next it hides the address of the old STRAT routineinternally ... routineinternally in itself at STRJMP, and then writes the body of its codeto the end of the SYS file. That’s all there is to it. The logic of DEVIRUS is depicted in Figure 14. 3, and its action on a typicalSYS ... using DPMI function 7. 4. Set the limit (size) of the new segment using DPMI function 8. Thisis just the size of the memory we allocated above.5. Set the access rights for the new segment to be...
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the giant black book of computer viruses phần 3 potx
... free at the time of the ;execution of the boot sector. ORG 0500HDISK_BUF: DB ? ;Start of the buffer;Here is the start of the boot sector code. This is the chunk we will take out ;of the compiled ... loading, the virus would have crashed the system. (And that, incidently, is why the virus we’re discussing is the Kilroy-B. The Kilroy virus dis-cussed in The Little Black Book of Computer Viruses ... SEC_SIZE - 1]/SEC_SIZEand the size of the file in sectors. The file size in bytes is stored atoffset 1CH from the start of the directory entry at 0000:0500H. The number of sectors to load isSIZE...
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The Little Black Book of Computer Viruses phần 4 potx
... value in the code segment60 The Little Black Book of Computer Viruses Offset Size Name Description 12H (Cont) properly. The INTRUDER virus will not alter the checksum. 14H 2 Initial ip The initial ... risk! It’s not like any other computer program you’ve ever run!52 The Little Black Book of Computer Viruses infecting every EXE file on the system. To do that we make use of the typical PC user’s ... before INFECT, the SHOULDRUN routine becomesSHOULDRUN: xor ah,ahSR1: nop int 1AH and al,63 ret 64 The Little Black Book of Computer Viruses Next, move the first five bytes of the original...
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the giant black book of computer viruses phần 1 ppsx
... far. Not so, the computer virus, becauseit attaches itself to otherwise useful programs. The computer userwill execute these programs in the normal course of using the computer, and the virus ... Bulletin, January, 19 94, p. 14. 3 The Crypt Newsletter, No. 8.Part ISelf-Reproduction The GIANT Black Book of Computer Viruses byMark LudwigAmerican Eagle Publications, Inc.Post Office Box 1507Show ... viruses 2. Companion viruses 3. Parasitic viruses If you can understand these three simple types of viruses, you willalready understand the majority of viruses being written today.Most of them...
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the giant black book of computer viruses phần 2 pdf
... relative to the start of the code in the EXE file. This is relocated by DOS at load time. 18H 2 Reloc Tbl Offset Offset of the start of the relocation table from the start of the file, in ... be the first byte of the virus.3. Write the virus code currently executing to the end of the EXE filebeing attacked. 4. Write the initial value of ss:sp, as stored in the EXE Header, to the location ... and then get on with the business of finding anotherfile.Since the first thing the virus must do is place its code at the end of the COM file it is attacking, it sets the file pointer to the...
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the giant black book of computer viruses phần 5 pot
... function andthen disassemble it. the virus is run. Thus, all of Developer A and Developer B’s clientscould suffer loss from the virus, regardless of whether or not theydeveloped software of their ... pushed on the stack and the function is called with a far call. In OS/2 the function namesand the names of the modules where they reside are different, of course. For example, instead of calling ... Most of the people who buy Developer A’s software will never even have the opportunity to watch the virus replicate because they don’tdevelop software and they don’t have any C files on their...
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the giant black book of computer viruses phần 6 pot
... move to the end of the file with the code mov ax,4C02H xor cx,cx xor dx,dx int 21H The true file length is then returned in dx:ax. To this number it adds the distance from the end of the file ... is stored at offset 4 in the List of Lists. System File Table entries are stored in blocks. Each blockcontains a number of entries, stored in the word at offset 4 from the start of the block. ... directory full of Slips-infected EXE files anduse PKZIP on them to create a ZIP file of them, all of the files in the ZIP file will be uninfected, even if all of the actual files in the directory...
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the giant black book of computer viruses phần 7 pot
... should include them. At the other end of the scale, the fancier you want to get, the better. You can probablythink of a lot of instructions that modify at most one register. The more possibilities ... EMPTY_8 042 mov al,0D1H out 64H,al call EMPTY_8 042 mov al,0DFH out 60H,al call EMPTY_8 042 ret;This waits for the 8 042 buffer to emptyEMPTY_8 042 : in al,64H and al,2 jnz EMPTY_8 042 retINTA00 ... To quote the father of the modern computer, John VonNeumann, “Anyone who considers arithmetical methods of pro-ducing random digits is, of course, in a state of sin.”As I mentioned, the VME...
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the giant black book of computer viruses phần 8 pot
... in the directory where the file is missing, and you don’thave integrity data for any of them anymore. You scan them, sure,but the scanner turns up nothing. Why was the file missing? Areany of ... much work.All one has to do is calculate the size of the file from the EXEheader, rather than from the file system, and use that to add the virusto the file. An alternative would be to simply ... routine moves the virus (this program) to the end of the EXE file;Basically, it just copies everything here to there, and then goes and;adjusts the EXE file header and two relocatables in the program,...
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the giant black book of computer viruses phần 9 pdf
... 91,209,1 74, 232,119,231,113, 241 ,101,56,222,207, 24, 242 ,40 ,236,6,183,206, 44 ,152, 14, 36, 34, 83,199, 140 ,1,156,73,197, 84, 195,151,253,169,73,81, 246 , 158, 243 ,22 ,46 , 245 ,85,157,110,108,1 64, 110, 240 ,135,167,237,1 24, 83,173,173, 146 ,196,201,106,37,71,129,151,63,137,166,6,89,80, 240 , 140 ,88,160,138,11, ... 2 14, 159,11,137,32,236,233, 244 ,75,166,232,195,101,2 54, 72,20,100, 241 , 247 , 1 54, 86, 84, 192 ,46 ,72,52,1 24, 156,79,125, 14, 250,65,250, 34, 233,20,190, 145 , 135,186,199, 241 ,53,215,197,209,117 ,4, 137,36,8,203, 14, 1 04, 83,1 74, 153,208, 91,209,1 74, 232,119,231,113, 241 ,101,56,222,207, 24, 242 ,40 ,236,6,183,206, ... 172,226,23,133,180,69,190,59, 148 ,152, 246 ,44 ,9, 249 ,251,196,85,39,1 54, 1 84, 74, 141 ,91,156,79,121, 140 ,232,172,22,130,253,253,1 54, 120,211,102,183, 145 , 113,52, 246 ,189,138,12,199,233,67,57,57,31, 74, 123, 94, 1,25, 74, 188,30,73, 83,225, 24, 23,202,111,209,77,29,17,2 34, 188,171,187,138,195,16, 74, 142 ,185,...
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