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Echo Magazine Issue 07 Phile 0x013

eZine's profile picture
Published in 
Echo Magazine
 · 4 years ago

  

____________________ ___ ___ ________
\_ _____/\_ ___ \ / | \\_____ \
| __)_ / \ \// ~ \/ | \
| \\ \___\ Y / | \
/_______ / \______ /\___|_ /\_______ /
\/ \/ \/ \/


.OR.ID
ECHO-ZINE RELEASE
07

Author: knot |syuhada@antizionist.cjb.net
Online @ www.echo.or.id :: http://ezine.echo.or.id


== Tutorial Enkripsi vbsworm ==



pada suatu hari saya menemukan komputer saya telah terinfeksi sebuah worm yang menetap di hd.
say menduga2 worm apa nih. biasanya titik awal worm menginfeksi sistem adalah membuat entry di
registry startup. so saya langsung ketik msconfig. saya terkejut karena saya tidak menemukan
path ke file vbs. tapi yang membuat saya tekejut adalah adanya entry baru yang dipanggil dari
start up yang ternyata adalah sebuah file system "KERNEL32.DLL" what the hell?? merasa ada yang
tidak beres saya mencoba-coba membuka file system tsb dengan notepad.

whala yang saya temukan ternyata sebuah worm vbs yang telah dienkripsi dengan sederhana. jika
men-scrool ke bawah notepad tsb maka akan anda temukan rutin deskripsinya. sipp.

langkah selanjutnya saya harus men-disinfect komputer saya. untuk itu saya perlu menguraikan
kode-kode jelek ini dulu. saya menggunakan visual basic untuk membalikkan proses deskripsi
dan mengarahkan outputnya tidak ke sistem tetapi ke sebuah text box. beberapa kali coba2,
alhasil dapatlah saya memahami kode jelek ini. yang sekarang lebih user friendly :)

entah dari mana saya tau, tapi ketika itu saya menamai file itu vbs_redlof_source.vbs well
correct me if i worm (wrong) .


SECTION I
[RUTIN DESKRIPSI]

perhatikan 3 baris terakhir dari worm tsb. ini adalah baris rutin deskripsi.
yang kalau diuraikan menjadi:

----------------
Dim KeyArr(3),ThisText
KeyArr(0) = 0
KeyArr(1) = 2
KeyArr(2) = 2
KeyArr(3) = 4
For i=1 To Len(ExeString)
TempNum = Asc(Mid(ExeString,i,1))
If TempNum = 18 Then
TempNum = 34
End If
TempChar = Chr(TempNum + KeyArr(i Mod 4))
If TempChar = Chr(28) Then
TempChar = vbCr
ElseIf TempChar = Chr(29) Then
TempChar = vbLf
End If
ThisText = ThisText & TempChar
Next
---------------

sedangkan yang menjadi chiper text adalah baris pertama program samapai bagian deskripsi. yaitu
yang diawali dengan "ExeString=" ini menunjukkan bahwa variabel ExeString berisi kode worm yang
telah terenkripsi.

see!

logika enkripsi/deskripsi worm ini mirip dengan yang dilakukan oleh [k] dalam vbswg.


_______________ ___________ ______________
| | rutin |x| |x| |x| | | |
| | deskripsi ------------- susun ulang | |
| Chiper Text | ----------------> |x| |x| |x| | ------------> | Plain text |
| | ------------- | |
|_______________| |x| |x| |x| | |______________|


bingung? saya juga bingung ketika menuangkan nya dalam grafik.
logikanya begini
1. rutin deskripsi akan men "terjemahkan" satu demi satu karakter yang terdapat dalam
chiper text.
2. lalu baris berikutnya akan menyusun urutan kode2 yang telah di terjemahkan tsb dalam
urutan silang.
misalnya chiper text terdiri dari | c a |
| b d |
lalu akan disusun ulang menjadi
| a b |
| c d |
understood?

cukup mudah sebenarnya. tetapi akan memusingkan jika anda tidak menganalisa sendiri source
codenya dan membayangkan untuk menjalankan nya beris demi baris dalam pikiran anda.

dengan mengerti logika deskripsi nya maka tidak akan menjadi sesuatu yang sulit untuk anda
membuat rutin enkripsinya. setelah keseluruhan badan program di deskripsi maka akan didapat:

full source
NOTE:
Untuk men-decode-nya, gunakan perintah `uudecode [file ini]`

Contoh:
$ uudecode vbsw1.txt
$ tar -zxf vbsw1.tar.gz

-------------------
begin 644 vbsw1.tar.gz
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end

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next :
saya akan berusaha untuk menjelaskan fungsi demi fungsi, sub demi sub dari worm ini.
viva indonesian viruz writer!

-----------------------------[eof]-------------------------------------------------------

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