Win32.Brontok.A@mm
( W32/Rontokbro.gen@MM, W32.Rontokbro@mm, Worm/Brontok.a, Email-Worm.Win32.Brontok.a )| Spreading: | medium | |
| Damage: | medium | |
| Size: | 42,028 | |
| Discovered: | 2005 Oct 14 |
SYMPTOMS:
- You can't start Regedit.exe
- When trying to start any other registry editor, the system restarts
- The system also restarts when executing certain EXE files
- The presence of the following files:
- %WINDIR%\eksplorasi.pif
- %UserProfile%\Local Settings\Application Data\smss.exe
- %UserProfile%\Local Settings\Application Data\services.exe
- %UserProfile%\Local Settings\Application Data\lsass.exe
- %UserProfile%\Local Settings\Application Data\csrss.exe
- %UserProfile%\Local Settings\Application Data\inetinfo.exe
- %UserProfile%\Local Settings\Application Data\winlogon.exe
- %UserProfile%\Start Menu\Programs\Startup\Empty.pif
- %UserProfile%\Templates\WowTumpeh.com
- %WINDIR%\%CURRENT_USER%'s Setting.scr
- %WINDIR%\ShellNew\bronstab.exe
TECHNICAL DESCRIPTION:
The worm comes as an attachment in an infected email, that looks like this:Subject: (empty)
Message:
-- Hentikan kebobrokan di negeri ini --
1. Adili Koruptor, Penyelundup, Tukang Suap, Penjudi, & Bandar NARKOBA
( Send to "NUSAKAMBANGAN")
2. Stop Free Sex, Absorsi, & Prostitusi
3. Stop (pencemaran laut & sungai), pembakaran hutan & perburuan liar.
4. SAY NO TO DRUGS !!!
-- KIAMAT SUDAH DEKAT --
Terinspirasi oleh: Elang Brontok (Spizaetus Cirrhatus) yang hampir punah[
By: HVM31-Jowobot #VM Community--
The attached file has an icon that imitates an usual Windows folder:

If executed, an Explorer window with My Documents folder is open. The worm installs itself in the locations specified in the Symptoms section.
The worm starts scanning files having the following extensions in order to gather email addresses to havest:
- asp
- cfm
- csv
- doc
- eml
- html
- php
- txt
- wab
- ADMIN AHNLAB ALADDIN ALERT ALWIL ANTIGEN
- ASSOCIATE AVAST AVIRA BILLING@ BUILDER
- CILLIN CONTOH CRACK DATABASE DEVELOP
- ESAFE ESAVE ESCAN EXAMPLE GRISOFT HAURI
- INFO@ LINUX MASTER MICROSOFT NETWORK
- NOD32 NORMAN NORTON PANDA PROGRAM
- PROLAND PROTECT ROBOT SECURITY SOURCE
- SYBARI SYMANTEC TRUST UPDATE VAKSIN
- VAKSIN VIRUS
- %UserProfile%\Local Settings\Application Data\Loc.Mail.Bron.Tok
In the same folder as the one specified above, the worm creates the following ones, that it will use at the mass-mailing process:
- Ok-SendMail-Bron-tok
- Bron.tok-[x]-[y] (where x and y are two random numbers)
In order to assure it is executed at every system startup, it creates the following registry entries:
It will disable Folder Options in Windows Explorer, by setting the following Registry value:
The following entries will be set at the specified values:
Removal instructions:
Method 1: Let BitDefender deletes the files it finds infected with the worm.Method 2: Download and run the removal tool, using the link at the top of this page.
The removal tool will:
- Find any Brontok-infected files on your computer
- Kill the worm's processes
- Restore acess to Regedit
- Restore access to Folder Options
- Restore the default values for those entries that the worm changes.
- Delete (or fix) the startup entries related to the worm.
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