Worm/Brontok.J - Worm

See also

Summary

Full description

Statistics

Virus:	Worm/Brontok.J
Date discovered:	30/03/2006
Type:	Worm
In the wild:	Yes
Reported Infections:	Low
Distribution Potential:	Medium
Damage Potential:	Medium
Static file:	No
File size:	45.120 Bytes
VDF version:	6.34.00.117 - Thu, 30 Mar 2006 11:53 (GMT+1)

General Method of propagation:
   • Email

Aliases:
   • Symantec: W32.Rontokbro.X@mm
   • Mcafee: W32/Rontokbro
   • Kaspersky: Email-Worm.Win32.Brontok.n
   • TrendMicro: WORM_RONTOKBR.AO
   • Bitdefender: Win32.Brontok.W@mm

Platforms / OS:
   • Windows 98
   • Windows 98 SE
   • Windows NT
   • Windows ME
   • Windows 2000
   • Windows XP
   • Windows 2003

Side effects:
   • Disable security applications
   • Drops files
   • Uses its own Email engine
   • Registry modification

Right after execution the following information is displayed:

Files It copies itself to the following locations:
   • %WINDIR%\j%system-dependent%.exe
   • %SYSDIR%\c%system-dependent%k.com
   • %SYSDIR%\s%system-dependent%\zh%system-dependent%y.exe
   • %WINDIR%\o%system-dependent%.exe
   • %WINDIR%\_default%system-dependent%.pif
   • %home%\Local Settings\Application Data\dv%system-dependent%0x\yesbron.com
   • %WINDIR%\Us%system-dependent%\qm%system-dependent%.exe
   • %SYSDIR%\s%system-dependent%\m%system-dependent%.exe
   • %SYSDIR%\s%system-dependent%\zh%system-dependent%y.exemsatr.bin
   • %SYSDIR%\s%system-dependent%\csrss.exe
   • %SYSDIR%\s%system-dependent%\services.exe
   • %SYSDIR%\s%system-dependent%\lsass.exe
   • %SYSDIR%\s%system-dependent%\smss.exe
   • %SYSDIR%\s%system-dependent%\winlogon.exe
   • %SYSDIR%\s%system-dependent%\o%system-dependent%.exe
   • %home%\Local Settings\Application Data\jalak-%system-dependent%-bali.com

It renames the following file:

    • %SYSDIR%\msvbm60.dll into %SYSDIR%\msvbm60.dll.%several random numbers from 0 to 9%

The following files are created:

– Temporary files that might be deleted afterwards:
   • %SYSDIR%\s%system-dependent%\domlist.txt
   • %SYSDIR%\s%system-dependent%\getdomlist.txt
   • %SYSDIR%\s%system-dependent%\brdom.bat

– %SYSDIR%\s%system-dependent%\Spread.Mail.Bro\%receiver's email address%.ini This is a non malicious text file with the following content:
   • Brontok.C
     By:JowoBot

– c:\Baca Bro !!!.txt This is a non malicious text file with the following content:
   • BRONTOK.C[22]



     Sedikit Jawaban u/ Membungkam Mulut Sesumbar 'MEREKA'.

     Nobron = Satria Dungu = Nothing !!!
     Romdil = Tukang Jiplak = Nothing !!!

     Nobron & Romdil -->> Kicked by The Amazing Brontok




      [ By JowoBot ]

– %SYSDIR%\s%system-dependent%\c.bron.tok.txt This is a non malicious text file with the following content:
   • Brontok.C
     By:JowoBot

– %WINDIR%\Tasks\At1.job File is a scheduled task that runs the malware at predefined times.
– %WINDIR%\Tasks\At2.job File is a scheduled task that runs the malware at predefined times.

It tries to download some files:

– The location is the following:
   • http://www.net4free.org/Arts/bddwyrk/**********
It is saved on the local hard drive under: %SYSDIR%\s%system-dependent%\zh%system-dependent%y.exeupi22xbm.ini

– The location is the following:
   • http://debuging.com/WS1/cgi/x.cgi?NAVG=Tracker&username=dudxwd
It is saved on the local hard drive under: %SYSDIR%\s%system-dependent%\svt22sj.tok

Registry The following registry keys are added in order to run the processes after reboot:

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • "f%system-dependent%Use"=""%SYSDIR%\s%system-dependent%\zh%system-dependent%y.exe""

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\
   run]
   • "f%system-dependent%Use"=""%home%\Local Settings\Application Data\dv%system-dependent%0x\yesbron.com""

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   • "A%system-dependent%r"=""%WINDIR%\j%system-dependent%.exe""

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\
   run]
   • "A%system-dependent%r"=""%WINDIR%\_default%system-dependent%.pif""

The values of the following registry keys are removed:

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • Adie Suka Kamu
   • Adie Strio X
   • SysYuni
   • SysDiaz
   • Sys_Romantic-Devil.R
   • SysRia
   • Pluto
   • DllHost
   • iExplorer
   • lExplorer
   • dkernel.exe
   • dkernel
   • Security
   • local service
   • SymRun
   • ccapp
   • CCAPPS
   • LoadServices
   • LoadService
   • MsPatch
   • Tok-Cirrhatus-%system-dependent%Usec
   • Tok-Cirrhatus
   • Tok-Cirrhatus-%system-dependent%

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   • Adie Suka Kamu
   • Adie Strio X
   • SysYuni
   • SysDiaz
   • Sys_Romantic-Devil.R
   • SysRia
   • Pluto
   • DllHost
   • iExplorer
   • lExplorer
   • dkernel.exe
   • dkernel
   • Security
   • local service
   • SymRun
   • ccapp
   • CCAPPS
   • LoadServices
   • LoadService
   • MsPatch
   • Bron-Spizaetus-%system-dependent%XPPM
   • Bron-Spizaetus

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer]
   • NoFolderOptions

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\
   run]
   • Tok-Cirrhatus-%system-dependent%Usec
   • brl

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\
   run]
   • Bron-Spizaetus-%system-dependent%XPPM

The following registry key is added:

– [HKLM\SYSTEM\CurrentControlSet\Control\SafeBoot]
   • "AlternateShell"="c_%system-dependent%k.com"

The following registry keys are changed:

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced]
   Old value:
   • "Hidden"=%user defined settings%
   • "HideFileExt"=%user defined settings%
   • "ShowSuperHidden"=%user defined settings%
   New value:
   • "Hidden"=dword:00000000
   • "HideFileExt"=dword:00000001
   • "ShowSuperHidden"=dword:00000000

Disable Regedit and Task Manager:
– [HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System]
   Old value:
   • "DisableRegistryTools"=%user defined settings%
   New value:
   • "DisableRegistryTools"=dword:00000001

– [HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon]
   Old value:
   • "Shell"=%user defined settings%
   • "Userinit"=%user defined settings%
   New value:
   • "Shell"="Explorer.exe "%WINDIR%\o%system-dependent%.exe""
   • "Userinit"="%SYSDIR%\userinit.exe,%WINDIR%\j%system-dependent%.exe"

Email It contains an integrated SMTP engine in order to send emails. A direct connection with the destination server will be established. The characteristics are described in the following:
The language in which the email is sent out depends on the Top-Level-Domain.

To:
– Email addresses found in specific files on the system.

Email design:

Subject: My Best Photo
Body:
   • Hi,
     I want to share my photo with you.
     Wishing you all the best.

     Regards,
Subject: Fotoku yg Paling Cantik
Body:
   • Hi,
     Aku lg iseng aja pengen kirim foto ke kamu.
     Jangan lupain aku ya !.

     Thanks,

Attachment:
The contents of the file is not a copy of itself but another malware.

The filename of the attachment is:
   • Photo.zip

Mailing Search addresses:
It searches the following files for email addresses:
   • csv
   • asp
   • html
   • eml
   • htm
   • doc
   • cfm
   • wab
   • txt

Avoid addresses:
It does not send emails to addresses containing one of the following strings:
   • pcmag; pcplus; pcmedia; chip; yahoo; abuse; borland; -_; _-; __; --;
      acer; compaq; torvald; trovald; detik; .ppt; .cfm; .eml; .txt; .jpg;
      .gif; .xls; .doc; .pdf; anony; coding; guru; code; script; @mm; w32;
      _@; @_; -@; @-; ._; _.; .-; -.; NONE; CASTLE; WINRAR; WINZIP; HELP;
      IRFANVIEW; MSDN; .CA.COM; PROMO; SALES; CLICK; IPTEK; USERNAME;
      SIERRA; STUDIO; TELECOM; LUCENT; NASA; ELECTRO; ELEKTRO; SYNDICAT;
      LOOKSMART; @123; @ABC; XANDROS; BUNTU; SUSE; REDHA; SLACK; @MAC; FUJI;
      INFORMA; TRACK; KDE; IEEE; LAB; MATH; BUG; FREE; REGIST; SPYW; SECUN;
      COMPUTE; COMPUSE; BROWSE; ALWIL; ROBOT; ANTIGEN; SYBARI; NOD32; HAURI;
      ESCAN; PROLAND; AHNLAB; DATABASE; BUILDER; ALADDIN; PROTECT; ESAFE;
      ESAVE; TRUST; AVAST; AVIRA; ADMIN; ZOMBIE; SPERSKY; GOOGLE; SUN.;
      POSTGRE; MYSQL; APACHE; NVIDIA; W3.; NOKIA; FUJITSU; SIEMENS; TREND;
      MICRO; LOTUS; CISCO; SEKUR; RELAY; GATEWAY; GROUP; OVERTURE; RESPONSE;
      NEWS; NOVELL; ALERT; OPERA; MOZILLA; NETSCAPE; ARCHIEVE; SERVICE;
      CANON; XEROX; HP.; DOWNLOAD; CNET; ZDNET; ZEND; PROXY; SERVER;
      RECIPIENT; FUCK; ADOBE; MACRO; INTEL.; IBM.; FEEDBACK; BLEEP; BLACK;
      DARK; SENIOR; KOMPUTER; FOO@; DEMO; HIDDEN; DOMAIN; BILLING@; INFO@;
      CONTOH; EXAMPLE; SMTP; XXX; ..; TEST; NETWORK; SOURCE; PROGRAM; WWW;
      .@; @.; ASDF; SOME; YOUR; BLAH; SPAM; SOFT; PANDA; NORMAN; NORTON;
      ASSOCIATE; SYMANTEC; SECURITY; CILLIN; GRISOFT; AVG; LINUX; CRACK;
      HACK; VIRUS; MICROSOFT; MASTER; SUPPORT; SECURE; UPDATE; DEVELOP;
      VAKSIN

Prepend MX strings:
In order to get the IP address of the mail server it has the ability to prepend the following strings to the domain name:
   • ns1.
   • mail.
   • smtp.

Hosts The host file is modified as explained:

– In this case existing entries are deleted.

– Access to the following domains is effectively blocked:
   • mcafee.com; www.mcafee.com; mcafee.net; www.mcafee.net; mcafee.org;
      www.mcafee.org; mcafeesecurity.com; www.mcafeesecurity.com;
      mcafeesecurity.net; www.mcafeesecurity.net; mcafeesecurity.org;
      www.mcafeesecurity.org; mcafeeb2b.com; www.mcafeeb2b.com;
      mcafeeb2b.net; www.mcafeeb2b.net; mcafeeb2b.org; www.mcafeeb2b.org;
      nai.com; www.nai.com; nai.net; www.nai.net; nai.org; www.nai.org;
      vil.nai.com; www.vil.nai.com; vil.nai.net; www.vil.nai.net;
      vil.nai.org; www.vil.nai.org; grisoft.com; www.grisoft.com;
      grisoft.net; www.grisoft.net; grisoft.org; www.grisoft.org;
      kaspersky-labs.com; www.kaspersky-labs.com; kaspersky-labs.net;
      www.kaspersky-labs.net; kaspersky-labs.org; www.kaspersky-labs.org;
      kaspersky.com; www.kaspersky.com; kaspersky.net; www.kaspersky.net;
      kaspersky.org; www.kaspersky.org; downloads1.kaspersky-labs.com;
      www.downloads1.kaspersky-labs.com; downloads1.kaspersky-labs.net;
      www.downloads1.kaspersky-labs.net; downloads1.kaspersky-labs.org;
      www.downloads1.kaspersky-labs.org; downloads2.kaspersky-labs.com;
      www.downloads2.kaspersky-labs.com; downloads2.kaspersky-labs.net;
      www.downloads2.kaspersky-labs.net; downloads2.kaspersky-labs.org;
      www.downloads2.kaspersky-labs.org; downloads3.kaspersky-labs.com;
      www.downloads3.kaspersky-labs.com; downloads3.kaspersky-labs.net;
      www.downloads3.kaspersky-labs.net; downloads3.kaspersky-labs.org;
      www.downloads3.kaspersky-labs.org; downloads4.kaspersky-labs.com;
      www.downloads4.kaspersky-labs.com; downloads4.kaspersky-labs.net;
      www.downloads4.kaspersky-labs.net; downloads4.kaspersky-labs.org;
      www.downloads4.kaspersky-labs.org; download.mcafee.com;
      www.download.mcafee.com; download.mcafee.net; www.download.mcafee.net;
      download.mcafee.org; www.download.mcafee.org; norton.com;
      www.norton.com; norton.net; www.norton.net; norton.org;
      www.norton.org; symantec.com; www.symantec.com; symantec.net;
      www.symantec.net; symantec.org; www.symantec.org;
      liveupdate.symantecliveupdate.com;
      www.liveupdate.symantecliveupdate.com;
      liveupdate.symantecliveupdate.net;
      www.liveupdate.symantecliveupdate.net;
      liveupdate.symantecliveupdate.org;
      www.liveupdate.symantecliveupdate.org; liveupdate.symantec.com;
      www.liveupdate.symantec.com; liveupdate.symantec.net;
      www.liveupdate.symantec.net; liveupdate.symantec.org;
      www.liveupdate.symantec.org; update.symantec.com;
      www.update.symantec.com; update.symantec.net; www.update.symantec.net;
      update.symantec.org; www.update.symantec.org;
      securityresponse.symantec.com; www.securityresponse.symantec.com;
      securityresponse.symantec.net; www.securityresponse.symantec.net;
      securityresponse.symantec.org; www.securityresponse.symantec.org;
      sarc.com; www.sarc.com; sarc.net; www.sarc.net; sarc.org;
      www.sarc.org; vaksin.com; www.vaksin.com; vaksin.net; www.vaksin.net;
      vaksin.org; www.vaksin.org; forum.vaksin.com; www.forum.vaksin.com;
      forum.vaksin.net; www.forum.vaksin.net; forum.vaksin.org;
      www.forum.vaksin.org; norman.com; www.norman.com; norman.net;
      www.norman.net; norman.org; www.norman.org; trendmicro.com;
      www.trendmicro.com; trendmicro.net; www.trendmicro.net;
      trendmicro.org; www.trendmicro.org; trendmicro-europe.com;
      www.trendmicro-europe.com; trendmicro-europe.net;
      www.trendmicro-europe.net; trendmicro-europe.org;
      www.trendmicro-europe.org; ae.trendmicro-europe.com;
      www.ae.trendmicro-europe.com; ae.trendmicro-europe.net;
      www.ae.trendmicro-europe.net; ae.trendmicro-europe.org;
      www.ae.trendmicro-europe.org; it.trendmicro-europe.com;
      www.it.trendmicro-europe.com; it.trendmicro-europe.net;
      www.it.trendmicro-europe.net; it.trendmicro-europe.org;
      www.it.trendmicro-europe.org; secunia.com; www.secunia.com;
      secunia.net; www.secunia.net; secunia.org; www.secunia.org;
      winantivirus.com; www.winantivirus.com; winantivirus.net;
      www.winantivirus.net; winantivirus.org; www.winantivirus.org;
      pandasoftware.com; www.pandasoftware.com; pandasoftware.net;
      www.pandasoftware.net; pandasoftware.org; www.pandasoftware.org;
      esafe.com; www.esafe.com; esafe.net; www.esafe.net; esafe.org;
      www.esafe.org; f-secure.com; www.f-secure.com; f-secure.net;
      www.f-secure.net; f-secure.org; www.f-secure.org; europe.f-secure.com;
      www.europe.f-secure.com; europe.f-secure.net; www.europe.f-secure.net;
      europe.f-secure.org; www.europe.f-secure.org; bhs.com; www.bhs.com;
      bhs.net; www.bhs.net; bhs.org; www.bhs.org; datafellows.com;
      www.datafellows.com; datafellows.net; www.datafellows.net;
      datafellows.org; www.datafellows.org; cheyenne.com; www.cheyenne.com;
      cheyenne.net; www.cheyenne.net; cheyenne.org; www.cheyenne.org;
      ontrack.com; www.ontrack.com; ontrack.net; www.ontrack.net;
      ontrack.org; www.ontrack.org; sands.com; www.sands.com; sands.net;
      www.sands.net; sands.org; www.sands.org; sophos.com; www.sophos.com;
      sophos.net; www.sophos.net; sophos.org; www.sophos.org; icubed.com;
      www.icubed.com; icubed.net; www.icubed.net; icubed.org;
      www.icubed.org; perantivirus.com; www.perantivirus.com;
      perantivirus.net; www.perantivirus.net; perantivirus.org;
      www.perantivirus.org; castlecops.com; www.castlecops.com;
      castlecops.net; www.castlecops.net; castlecops.org;
      www.castlecops.org; virustotal.com; www.virustotal.com;
      virustotal.net; www.virustotal.net; virustotal.org;
      www.virustotal.org; free-av.com; www.free-av.com; free-av.net;
      www.free-av.net; free-av.org; www.free-av.org; antivirus.com;
      www.antivirus.com; antivirus.net; www.antivirus.net; antivirus.org;
      www.antivirus.org; anti-virus.com; www.anti-virus.com; anti-virus.net;
      www.anti-virus.net; anti-virus.org; www.anti-virus.org; ca.com;
      www.ca.com; ca.net; www.ca.net; ca.org; www.ca.org; fajarweb.com;
      www.fajarweb.com; fajarweb.net; www.fajarweb.net; fajarweb.org;
      www.fajarweb.org; jasakom.com; www.jasakom.com; jasakom.net;
      www.jasakom.net; jasakom.org; www.jasakom.org; backup.grisoft.com;
      www.backup.grisoft.com; backup.grisoft.net; www.backup.grisoft.net;
      backup.grisoft.org; www.backup.grisoft.org; infokomputer.com;
      www.infokomputer.com; infokomputer.net; www.infokomputer.net;
      infokomputer.org; www.infokomputer.org; playboy.com; www.playboy.com;
      playboy.net; www.playboy.net; playboy.org; www.playboy.org;
      sex-mission.com; www.sex-mission.com; sex-mission.net;
      www.sex-mission.net; sex-mission.org; www.sex-mission.org;
      pornstargals.com; www.pornstargals.com; pornstargals.net;
      www.pornstargals.net; pornstargals.org; www.pornstargals.org;
      kaskus.com; www.kaskus.com; kaskus.net; www.kaskus.net; kaskus.org;
      www.kaskus.org; 17tahun.com; www.17tahun.com; 17tahun.net;
      www.17tahun.net; 17tahun.org; www.17tahun.org; padinet.com;
      www.padinet.com; padinet.net; www.padinet.net; padinet.org;
      www.padinet.org; jeruk.padinet.com; www.jeruk.padinet.com;
      jeruk.padinet.net; www.jeruk.padinet.net; jeruk.padinet.org;
      www.jeruk.padinet.org; compactbyte.com; www.compactbyte.com;
      compactbyte.net; www.compactbyte.net; compactbyte.org;
      www.compactbyte.org; blog.compactbyte.com; www.blog.compactbyte.com;
      blog.compactbyte.net; www.blog.compactbyte.net; blog.compactbyte.org;
      www.blog.compactbyte.org; blogs.compactbyte.com;
      www.blogs.compactbyte.com; blogs.compactbyte.net;
      www.blogs.compactbyte.net; blogs.compactbyte.org;
      www.blogs.compactbyte.org

The modified host file will look like this:

Process termination List of processes that are terminated:
   • XPSHARE; ANTIVIRUS; MSPATCH; PARIS; PACAR; CEWE; AZHARI; FOTO; ALICIA;
      RENATA; MARIANA; SASTRO; DIAN; BROWNIES; KWASHER; VIRUS.; NURHALIZA;
      SITI.

Processes containing one of the following window titles are terminated:
   • peid; task view; telanjang; bugil; naked; alwil; wintask; folder
      option; trojan; avira; windows script; commander; pc-media; killer;
      ertanto; CLEANER; REMOVER; PROCESS EXP; SYSINTERNAL; killbox;
      scheduled task; computer management; cmd.exe; group policy; system
      configuration; command prompt; registry; baca bro !!!; task manager

File details Runtime packer:
In order to aggravate detection and reduce size of the file it is packed with a runtime packer.

See a brief description here.

Description inserted by Andrei Ivanes on Wed, 05 Apr 2006 12:44 (GMT+1)
Description updated by Andrei Ivanes on Mon, 08 May 2006 16:25 (GMT+1)

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