TROJ_FAKEAV.HLJ

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 connects to certain URLs. It may do this to remotely inform a malicious user of its installation. It may also do this to download possibly malicious files onto the computer, which puts the computer at a greater risk of infection by other threats.

It deletes the initially executed copy of itself.

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 copies of itself into the affected system and executes them:

• %System Root%\Documents And Settings\All Users\Application Data\{Random Name}.exe
• %ProgramData%\{Random Name}.exe - if operating system is Windows 7

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

It drops the following files:

• %Desktop%\Data_Recovery.lnk
• %Start Menu%\Programs\Data Recovery\Data Recovery.lnk
• %Start Menu%\Programs\Data Recovery\Uninstall Data Recovery.lnk
• %System Root%\Documents And Settings\All Users\Application Data\{Random Name}
• %System Root%\Documents And Settings\All Users\Application Data\-{Random Name}
• %System Root%\Documents And Settings\All Users\Application Data\-{Random Name}r
• %User Profile%\Application Data\Microsoft\Internet Explorer\Quick Launch\Data_Recovery.lnk
• {drive letter}:\ProgramData\{Random Name} - dropped if system is running on Windows 7
• %Application Data%\Microsoft\Internet Explorer\Quick Launch\Data_Recovery.lnk - dropped if system is running on Windows 7
• %Application Data%\Microsoft\Windows\Start Menu\Programs\Data Recovery\Data Recovery.lnk - dropped if system is running on Windows 7
• %Application Data%\Microsoft\Windows\Start Menu\Programs\Data Recovery\Uninstall Data Recovery.lnk - dropped if system is running on Windows 7
• %User Profile%\Desktop\Data_Recovery.lnk - dropped if system is running on Windows 7

(Note: %Desktop% is the current user's desktop, which is usually C:\Windows\Profiles\{user name}\Desktop on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Desktop on Windows NT, and C:\Documents and Settings\{User Name}\Desktop on Windows 2000, XP, and Server 2003.. %Start Menu% is the current user's Start Menu folder, which is usually C:\Windows\Profiles\{user name}\Start Menu on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu on Windows NT and C:\Windows\Start Menu or C:\Documents and Settings\{User name}\Start Menu on Windows 2000, XP, and Server 2003.. %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %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.. %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.)

It creates the following folders:

• %Start Menu%\Programs\Data Recovery
• %Application Data%\Microsoft\Windows\Start Menu\Programs\Data Recovery - created when malware is running on Windows 7

(Note: %Start Menu% is the current user's Start Menu folder, which is usually C:\Windows\Profiles\{user name}\Start Menu on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu on Windows NT and C:\Windows\Start Menu or C:\Documents and Settings\{User name}\Start Menu 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.)

Other System Modifications

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings
WarnonBadCertRecving = "0"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main
Use FormSuggest = "Yes"

HKEY_LOCAL_MACHINE\Software\Microsoft\
ESENT\Process\{Random Name}\
DEBUG
Trace Level = ""

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Attachments
SaveZoneInformation = "1"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings
WarnonBadCertRecving = "0"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings
WarnOnZoneCrossing = "0"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings
CertificateRevocation = "0"

HKEY_CURRENT_USER\Software\Microsoft\
CurrentVersion\Policies\Associations
LowRiskFileTypes = ".zip;.rar;.nfo;.txt;.exe;.bat;.com;.cmd;.reg;.msi;.htm;.html;.gif;.bmp;.jpg;.avi;.mpg;.mpeg;.mov;.mp3;.m3u;.wav;.scr;"

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Associations

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Attachments

HKEY_LOCAL_MACHINE\Software\Microsoft\
ESENT\Process\{Random Name}

HKEY_LOCAL_MACHINE\Software\Microsoft\
ESENT\Process\{Random Name}\
DEBUG

It modifies the following registry keys:

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Download
CheckExeSignatures = "No"

(Note: The default value data of the said registry entry is Yes.)

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\WinTrust\
Trust Providers\Software Publishing
State = "23e00"

(Note: The default value data of the said registry entry is 23c00.)

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
Zones\3
1601 = "0"

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

Download Routine

This Trojan connects to the following malicious URLs:

• http://{BLOCKED}adebima.com/support/s
• http://{BLOCKED}randep.com/support/s
• http://{BLOCKED}rtinfa.com/support/s
• http://{BLOCKED}udexa.com/support/s
• http://{BLOCKED}ding.com/support/s

Other Details

This Trojan deletes the initially executed copy of itself

NOTES:

This Trojan adds the following registry keys when it runs on a Windows 7 system:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\{Random Name}_RASAPI32

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\{Random Name}_RASMANCS

It adds the following registry entries when installed on a Windows 7 system:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\{Random Name}_RASAPI32
EnableFileTracing = "0"
EnableConsoleTracing = "0"
FileTracingMask = "ffff"
ConsoleTracingMask = "ffff"
MaxFileSize= "100000"
File Directory = "25,77,69,6e,64,69,72,25,5c,74,72,61,63,69,6e,67,00,"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\{Random Name}_RASMANCS
EnableFileTracing = "0"
EnableConsoleTracing = "0"
FileTracingMask = "ffff"
ConsoleTracingMask = "ffff"
MaxFileSize= "100000"
File Directory = "25,77,69,6e,64,69,72,25,5c,74,72,61,63,69,6e,67,00,"

It modifies the following registry entries when it is installed on a Windows 7 system:

HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Download
CheckExeSignatures = "No"

(Note: The default value data of the said registry entry is Yes.)

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\WinTrust\Trust Providers\Software Publishing
State = "23e00"

(Note: The default value data of the said registry entry is 23c00.)

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings
CertificateRevocation = "0"

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