Trojan.Encoder.283

Trojan.Encoder.283

Added to the Dr.Web virus database: 2013-08-13

Virus description added: 2013-08-13

To ensure autorun and distribution:

Modifies the following registry keys:

[<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'DirtyDecrypt' = '"\\?\%APPDATA%\Dirty\DirtyDecrypt.exe" /hide'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon] 'Userinit' = '<SYSTEM32>\userinit.exe,,%PROGRAM_FILES%\MSBuild\PCJuJDlX.exe'
[<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'hbOLDNpM' = '<LS_APPDATA>\VMware\GCUrZfWJ.exe'

Creates or modifies the following files:

Malicious functions:

To bypass firewall, removes or modifies the following registry keys:

[<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile] 'EnableFirewall' = '00000000'
[<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile] 'DoNotAllowExceptions' = '00000000'
[<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile] 'DisableNotifications' = '00000001'

To complicate detection of its presence in the operating system,

blocks execution of the following system utilities:

blocks the following features:

Creates and executes the following:

Modifies file system :

Creates the following files:

%APPDATA%\Microsoft\Protect\S-1-5-21-2052111302-484763869-725345543-1003\Preferred
%APPDATA%\Microsoft\Protect\S-1-5-21-2052111302-484763869-725345543-1003\c0104e94-66b5-435f-aa9d-39e3df117d95
%APPDATA%\Microsoft\Crypto\RSA\S-1-5-21-2052111302-484763869-725345543-1003\3ff6561d1b49399a51b7900e8a97afb3_23ef5514-3059-436f-a4a7-4cefaab20eb1
%APPDATA%\Microsoft\Crypto\RSA\S-1-5-21-2052111302-484763869-725345543-1003\b9f0ae80817374b26db03d01e8536059_23ef5514-3059-436f-a4a7-4cefaab20eb1
%APPDATA%\Microsoft\Crypto\RSA\S-1-5-21-2052111302-484763869-725345543-1003\01b4cd6eeeb403f8807248f4a4045343_23ef5514-3059-436f-a4a7-4cefaab20eb1
%APPDATA%\Microsoft\Crypto\RSA\S-1-5-21-2052111302-484763869-725345543-1003\ba6d73fc65cffec9046372ca3794c9f1_23ef5514-3059-436f-a4a7-4cefaab20eb1
%TEMP%\vCECHeFQ.exe
<LS_APPDATA>\VMware\GCUrZfWJ.exe
%PROGRAM_FILES%\MSBuild\PCJuJDlX.exe
%APPDATA%\Dirty\alertwall.jpg
<LS_APPDATA>\Dirty\DirtyDecrypt.exe
%APPDATA%\Dirty\DirtyDecrypt.exe
%PROGRAM_FILES%\Dirty\DirtyDecrypt.exe

Sets the 'hidden' attribute to the following files:

Deletes the following files:

%APPDATA%\Microsoft\Crypto\RSA\S-1-5-21-2052111302-484763869-725345543-1003\b9f0ae80817374b26db03d01e8536059_23ef5514-3059-436f-a4a7-4cefaab20eb1

Network activity:

Connects to:

UDP:

Miscellaneous:

Searches for the following windows: