TROJ_FAKEAV.BVY

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It employs registry shell spawning by adding certain registry entries. This allows this malware to execute even when other applications are opened.

It displays fake alerts that warn users of infection. It also displays fake scanning results of the affected system. It then asks for users to purchase it once scanning is completed. If users decide to purchase the rogue product, users are directed to a certain website asking for sensitive information, such as credit card numbers.

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This Trojan drops the following non-malicious files:

• %User Temp%\{random file name}
• %Application Data%\{random file name}
• %Application Data%\{random file name}.DAT
• %User Profile%\Templates\{random file name}
• %User Profile%\Application Data\{random file name}

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003.. %Application Data% is the current user's Application Data folder, which is usually C:\Windows\Profiles\{user name}\Application Data on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Application Data on Windows NT, and C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003.. %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)

It drops the following copies of itself into the affected system:

• %Application Data%\{random file name}.exe

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Windows\Profiles\{user name}\Application Data on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Application Data on Windows NT, and C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003.)

Autostart Technique

This Trojan employs registry shell spawning to ensure its execution when certain file types are accessed by adding the following entries:

HKEY_CLASSES_ROOT\.exe\shell\
open\command
(Default) = "{malware path and file name}" -a "%1" %*

HKEY_CLASSES_ROOT\exefile\shell\
open\command
(Default) = "{malware path and file name}" -a "%1" %*

HKEY_CURRENT_USER\Software\Classes\
.exe\shell\open\
command
(Default) = "{malware path and file name}" -a "%1" %*

HKEY_CURRENT_USER\Software\Classes\
exefile\shell\open\
command
(Default) = "{malware path and file name}" -a "%1" %*

Other System Modifications

This Trojan adds the following registry keys as part of its installation routine:

HKEY_CLASSES_ROOT\.exe\DefaultIcon

HKEY_CLASSES_ROOT\.exe\shell

HKEY_CURRENT_USER\Software\Classes\
.exe

HKEY_CURRENT_USER\Software\Classes\
exefile

HKEY_CURRENT_USER\Software\Microsoft\
GDIPlus

It modifies the following registry entries:

HKEY_CLASSES_ROOT\exefile\shell\
open\command
(Default) = "{malware path and file name}.exe" -a "%1" %*

(Note: The default value data of the said registry entry is "%1" %*.)

Other Details

This Trojan does the following:

• Installs itself on the infected system as a rogue antivirus using the following names:

  • {OS Name} Anti-Spyware
  • {OS Name} Anti-Spyware 2011
  • {OS Name} Anti-Virus 2011
  • {OS Name} Home Security
  • {OS Name} Home Security 2011
  • {OS Name} Internet Security 2011
  • {OS Name} Security 2011
  • {OS Name} Total Security
  • {OS Name} Total Security 2011
• Displays the following graphical user interface (GUI):

  

  

  

  

• Directs to any of following sites asking for sensitive information, once users decide to purchase the rogue product:
  • {BLOCKED}uboqo.com
  • {BLOCKED}xuxu.com
  • {BLOCKED}dar.com
  • {BLOCKED}woto.com
  • {BLOCKED}jisem.com
  • {BLOCKED}hulyqedy.com
  • {BLOCKED}lap.com
  • {BLOCKED}vahazyla.com
  • {BLOCKED}byfaf.com
  • {BLOCKED}nax.com
  • {BLOCKED}xypo.com
  • {BLOCKED}kovo.com
  • {BLOCKED}jepi.com
  • {BLOCKED}gyry.com
  • {BLOCKED}vunokyk.com
  • {BLOCKED}dywucyle.com
  • {BLOCKED}juwevul.com
  • {BLOCKED}lejuj.com
  • {BLOCKED}kalyn.com
  • {BLOCKED}hagupy.com
  • {BLOCKED}macik.com
  • {BLOCKED}naja.com
  • {BLOCKED}ragap.com
  • {BLOCKED}dupi.com
  • {BLOCKED}sativ.com
  • {BLOCKED}hidid.com
  • {BLOCKED}vywuge.com
  • {BLOCKED}mywy.com
  • {BLOCKED}kokazoz.com
  • {BLOCKED}vynyxu.com
  • {BLOCKED}nageboj.com
  • {BLOCKED}cin.com
  • {BLOCKED}vunevu.com
  • {BLOCKED}nojy.com
  • {BLOCKED}wobow.com
  • {BLOCKED}wemyvuda.com
  • {BLOCKED}kalyna.com
  • {BLOCKED}ziqyze.com
  • {BLOCKED}zyp.com
  • {BLOCKED}fyqevaz.com
  • {BLOCKED}zegokido.com
  • {BLOCKED}kuboqo.com
  • {BLOCKED}xohyqo.com
  • {BLOCKED}behasa.com
  • {BLOCKED}nejuf.com
  • {BLOCKED}hinynuh.com
  • {BLOCKED}jimaq.com
  • {BLOCKED}jez.com
  • {BLOCKED}vadaqyz.com
  • {BLOCKED}gapyhi.com
  • {BLOCKED}tige.com
  • {BLOCKED}paqatyc.com
  • {BLOCKED}nena.com
  • {BLOCKED}huh.com
  • {BLOCKED}gevuryt.com
  • {BLOCKED}sope.com
  • {BLOCKED}pyf.com
  • {BLOCKED}nyxorun.com
  • {BLOCKED}hibijy.com
  • {BLOCKED}xojis.com
  • {BLOCKED}bytedotu.com
  • {BLOCKED}zeno.com
  • {BLOCKED}qufikeg.com
  • {BLOCKED}papavi.com
  • {BLOCKED}cogiqek.com
  • {BLOCKED}fyp.com
  • {BLOCKED}zupilog.com
  • {BLOCKED}kubovu.com
  • {BLOCKED}pah.com
  • {BLOCKED}vykavo.com
  • {BLOCKED}kun.com
  • {BLOCKED}jybi.com
  • {BLOCKED}hoto.com
  • {BLOCKED}qoxyxyt.com
  • {BLOCKED}pyzoqah.com
  • {BLOCKED}pyla.com
  • {BLOCKED}dabati.com
  • {BLOCKED}tyn.com
  • {BLOCKED}cus.com
  • {BLOCKED}damaqyr.com
  • {BLOCKED}nazecit.com
  • {BLOCKED}ryfuwy.com
  • {BLOCKED}zykubo.com
  • {BLOCKED}semijawo.com
  • {BLOCKED}fodafur.com
  • {BLOCKED}zom.com
  • {BLOCKED}byrum.com
  • {BLOCKED}sotopib.com
  • {BLOCKED}syfage.com
  • {BLOCKED}gac.com
• Gathers the following information if the user chooses to activate the product:
  • Credit card information (i.e. card type, card number, expiration date, security code)
  • Contact information (i.e.name, address, email, phone number)

Rogue Antivirus Routine

This Trojan displays fake alerts that warn users of infection. It also displays fake scanning results of the affected system. It then asks for users to purchase it once scanning is completed. If users decide to purchase the rogue product, users are directed to a certain website asking for sensitive information, such as credit card numbers.