Virus:Worm/Komodo
Date discovered:06/03/2006
Type:Worm
In the wild:Yes
Reported Infections:Low
Distribution Potential:Medium to high
Damage Potential:Medium
Static file:Yes
File size:48.829 Bytes
MD5 checksum:1806d75a231dac7385307d888588de45
VDF version:6.33.01.70

 General Method of propagation:
   • Email
   • Local network


Platforms / OS:
   • Windows 95
   • Windows 98
   • Windows 98 SE
   • Windows NT
   • Windows ME
   • Windows 2000
   • Windows XP
   • Windows 2003


Side effects:
   • Disable security applications
   • Downloads files
   • Uses its own Email engine
   • Lowers security settings


Right after execution the following information is displayed:



 Files It copies itself to the following locations:
   • %SYSDIR%\n6873\smss.exe
   • %SYSDIR%\n6873\csrss.exe
   • %SYSDIR%\n6873\lsass.exe
   • %SYSDIR%\n6873\services.exe
   • %SYSDIR%\n6873\winlogon.exe
   • %WINDIR%\komodo-6262022.exe
   • %SYSDIR%\c_26202k.com
   • %SYSDIR%\n6873\sv711540830r.exe
   • %WINDIR%\cinderawasih-4262027.exe
   • %WINDIR%\_default26202.pif
   • %HOME%\Local Settings\Application Data\dv6154080x\yesbron.com



The following files are created:

– Files that contain collected email addresses:
   • %SYSDIR%\n6873\Spread.Mail.Bro\%receiver's email address%.ini
   • %SYSDIR%\n6873\Spread.Sent.Bro\%receiver's email address%.ini

– Temporary files that might be deleted afterwards:
   • %SYSDIR%\n6873\brmac.bat
   • %SYSDIR%\n6873\brdom.bat
   • %SYSDIR%\n6873\getmac.txt
   • %SYSDIR%\n6873\getdomlist.txt
   • %SYSDIR%\n6873\domlist.txt

– C:\Baca Bro !!!.txt This is a non malicious text file with the following content:
   • BRONTOK.C[19]
     Sedikit Jawaban u/ Membungkam Mulut Sesumbar 'MEREKA'.
     Nobron = Satria Dungu = Nothing !!!
     [ By JowoBot ]

– %SYSDIR%\n6873\c.bron.tok.txt This is a non malicious text file with the following content:
   • Brontok.C
     By:JowoBot




It tries to download a file:

– The location is the following:
   • http://www.geocities.com/bvcbrosbl/**********
It is saved on the local hard drive under: %SYSDIR%\n6873\sv711540830r.exeupinf.ini This file may contain further download locations and might serve as source for new threats.

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

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • Tok-Cirrhatus-2487namc = %SYSDIR%\n6873\sv711540830r.exe

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\
   run]
   • Tok-Cirrhatus-2487namc = %HOME%\Local Settings\Application Data\dv6154080x\yesbron.com

– [HKLM\Software\Microsoft\Windows\CurrentVersion\Run]
   • Bron-Spizaetus-4128XPPM = %WINDIR%\komodo-6262022.exe

– [HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\
   run]
   • Bron-Spizaetus-4128XPPM = %WINDIR%\_default26202.pif

– [HKLM\SYSTEM\CurrentControlSet\Control\SafeBoot]
   • AlternateShell = c_26202k.com



The values of the following registry keys are removed:

–  [HKLM\Software\Microsoft\Windows\CurrentVersion\Run]
   • iExplorer
   • lExplorer
   • dkernel.exe
   • dkernel
   • Security
   • local service
   • SymRun
   • OSA
   • ccapp
   • CCAPPS
   • LoadServices
   • LoadService
   • MsPatch
   • Bron-Spizaetus

–  [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • iExplorer
   • lExplorer
   • dkernel.exe
   • dkernel
   • Security
   • local service
   • SymRun
   • OSA
   • ccapp
   • CCAPPS
   • LoadServices
   • LoadService
   • MsPatch
   • Tok-Cirrhatus-2487
   • Tok-Cirrhatus



The following registry keys are changed:

– [HKLM\Software\Microsoft\Windows NT\CurrentVersion\Winlogon]
   Old value:
   • Userinit = %SYSDIR%\userinit.exe
   • Shell = Explorer.exe
   New value:
   • Userinit = %SYSDIR%\userinit.exe,%WINDIR%\komodo-6262022.exe
   • Shell = Explorer.exe "%WINDIR%\cinderawasih-4262027.exe"

Various Explorer settings:
– [HKCU\software\microsoft\windows\currentversion\explorer\advanced]
   Old value:
   • ShowSuperHidden = %user defined settings%
   • HideFileExt = %user defined settings%
   • Hidden = %user defined settings%
   New value:
   • ShowSuperHidden = dword:00000000
   • HideFileExt = dword:00000001
   • Hidden = dword:00000000

 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:


From:
The sender address is spoofed.


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


Email design:
 


Subject: My Photo on Paris
Body:
   • This photo was taken from my vacation on Paris, last week.
     Wishing you always remember me.
     Regards,
Attachment:
   • Picture.zip
 


Subject: Foto Liburanku di Bali
Body:
   • Halo Sobat,
     Ini fotoku saat liburan di Bali.
     Semoga kamu jadi ingat aku terus.
     Terima kasih,
Attachment:
   • Picture.zip


Attachment:

The attachment is a copy of the malware described here: TR/Dldr.Orangbi



The email looks like the following:


 Mailing Search addresses:
It searches the following files for email addresses:
   • .INI; .BAT; .PIF; .COM; .SCR; .EXE; .PPT; .XLS; .DOC; .CFM; .PHP;
      .ASP; .WAB; .EML; .CSV; .HTML; .HTM; .TXT


Avoid addresses:
It does not send emails to addresses containing one of the following strings:
   • yahoo; abuse; borland; acer; compaq; torvald; trovald; detik; 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; .VBS; .JS; .EXE;
      .HTM; .PHP; .ASP; 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; SATU; EMAILKU; BOLEH; GAUL; ASTAGA; .WEB.ID;
      .AC.ID; .OR.ID; .NET.ID; .SCH.ID; .MIL.ID; .GO.ID; .CO.ID; INDO;
      TELKOM; PLASA; LBS; PLD; HJT; MNE; AML; TPE; AGT; AUD; UTS; LON


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.

 Network Infection In order to ensure its propagation the malware attemps to connect to other machines as described below.


It uses the following login information in order to gain access to the remote machine:

– The following username:
   • %current username%



Infection process:
The downloaded file is stored on the compromised machine as: %HOME%\Local Settings\Application Data\jalak-931540815-bali.com


Remote execution:
–It attempts to schedule a remote execution of the malware, on the newly infected machine. Therefore it uses the NetScheduleJobAdd function.

 Process termination List of processes that are terminated:
   • rundll32.exe; diary.exe; avgupsvc.exe; Alicia Keys.exe; Mariana
      Renata.exe; Dian sastro.exe; foto administrator.exe; zlh.exe;
      AntiVirus StartUp.exe; sitinurhaliza.exe; virus.exe; services.com;
      ctfmon.exe; ccapp.exe; nopdb.exe; opscan.exe; vptray.exe; winword.exe;
      update.exe; lexplorer.exe; iexplorer.exe; dkernel.exe; nipsvc.exe;
      njeeves.exe; cclaw.exe; nvcoas.exe; aswupdsv.exe; ashmaisv.exe;
      systray.exe; riyani_jangkaru.exe; xpshare.exe; tskmgr.exe;
      poproxy.exe; mcvsescn.exe; untukmu.exe; sstray.exe; syslove.exe;
      mspatch.exe; kangen.exe; ccapps.exe; avgemc.exe

Processes containing one of the following window titles are terminated:
   • washer; anti; CLEANER; REMOVER; PROCESS EXP; SYSINTERNAL; movzx;
      ertanto; hijack; killbox; .exe; scheduled task; computer management;
      group policy; system configuration; command prompt; registry


 File details Programming language:
 The malware program was written in MS Visual C++.


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

Description inserted by Andrei Gherman on Monday, March 6, 2006
Description updated by Andrei Gherman on Monday, March 6, 2006

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