TROJ_FAKEAV.HPX

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 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:

• %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.)

It drops the following files:

• %Application Data%\evbddw7f6atf7qed4htn3p130l6k
• %System Root%\Documents and Settings\All Users\Application Data\evbddw7f6atf7qed4htn3p130l6k
• %User Temp%\evbddw7f6atf7qed4htn3p130l6k
• %User Profile%\Templates\evbddw7f6atf7qed4htn3p130l6k

(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.. %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %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.. %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 terminates the execution of the copy it initially executed and executes the copy it drops instead.

Other System Modifications

This Trojan adds the following registry keys:

HKEY_CLASSES_ROOT\{random key}

HKEY_CLASSES_ROOT\.exe\DefaultIcon

HKEY_CLASSES_ROOT\.exe\shell

It adds the following registry entries:

HKEY_CLASSES_ROOT\{random key}
(Default) = "Application"

HKEY_CLASSES_ROOT\{random key}
Content Type = "application/x-msdownload"

HKEY_CLASSES_ROOT\{random key}\DefaultIcon
(Default) = "%1"

HKEY_CLASSES_ROOT\{random key}\shell\
open\command
(Default) = ""%Application Data%\{random file name}.exe" -a "%1" %*"

HKEY_CLASSES_ROOT\{random key}\shell\
open\command
IsolatedCommand = ""%1" %*"

HKEY_CLASSES_ROOT\{random key}\shell\
runas\command
(Default) = ""%1" %*"

HKEY_CLASSES_ROOT\{random key}\shell\
runas\command
IsolatedCommand = ""%1" %*"

HKEY_CLASSES_ROOT\.exe
Content Type = "application/x-msdownload"

HKEY_CLASSES_ROOT\.exe\DefaultIcon
(Default) = "%1"

HKEY_CLASSES_ROOT\.exe\shell\
open\command
(Default) = ""%Application Data%\{random file name}.exe" -a "%1" %*"

HKEY_CLASSES_ROOT\.exe\shell\
open\command
IsolatedCommand = ""%1" %*"

HKEY_CLASSES_ROOT\.exe\shell\
runas\command
(Default) = ""%1" %*"

HKEY_CLASSES_ROOT\.exe\shell\
runas\command
IsolatedCommand = ""%1" %*"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\DomainProfile
DoNotAllowExceptions = 0

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\DomainProfile
DisableNotifications = 1

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile
DoNotAllowExceptions = 0

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile
DisableNotifications = 1

It modifies the following registry entries:

HKEY_CLASSES_ROOT\.exe
(Default) = "{random key}"

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

HKEY_LOCAL_MACHINE\SOFTWARE\Clients\
StartMenuInternet\IEXPLORE.EXE\shell\
open\command
(Default) = ""%Application Data%\{random file name}.exe" -a "%Program Files%\Internet Explorer\iexplore.exe""

(Note: The default value data of the said registry entry is ""%Program Files%\Internet Explorer\iexplore.exe"".)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Security Center
AntiVirusDisableNotify = 1

(Note: The default value data of the said registry entry is 0.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Security Center
FirewallDisableNotify = 1

(Note: The default value data of the said registry entry is 0.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Security Center
UpdatesDisableNotify = 1

(Note: The default value data of the said registry entry is 0.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Security Center
AntiVirusOverride = 1

(Note: The default value data of the said registry entry is 0.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Security Center
FirewallOverride = 1

(Note: The default value data of the said registry entry is 0.)

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess
Start = 4

(Note: The default value data of the said registry entry is 2.)

It deletes the following registry keys:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\wuauserv

Other Details

This Trojan connects to the following possibly malicious URL:

• http://{BLOCKED}sek.com/1002000112

It deletes the initially executed copy of itself