TROJ_FAKEAV.BVY
Microsoft : Rogue:Win32/FakeRean Kaspersky : Trojan.Win32.FakeAV.cuio
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Trojan
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
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.
TECHNICAL DETAILS
236,042 bytes
EXE
Yes
04 May 2011
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.
SOLUTION
8.900
Step 1
For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.
Step 2
Scan your computer with your Trend Micro product and note files detected as TROJ_FAKEAV.BVY
Step 3
Restart in Safe Mode
Step 4
Restore this modified registry value
Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer"s registry.
Step 5
Restore this modified registry value
Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.
- In HKEY_CLASSES_ROOT\exefile\shell\open\command
- From: (Default) = {malware path and file name}.exe -a %1 %*
To: (Default) = %1 %*
- From: (Default) = {malware path and file name}.exe -a %1 %*
Step 6
Search and delete these files
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_FAKEAV.BVY. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.
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