TROJ_NEUREVT.USNY

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 executes then deletes itself afterward.

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 a copy of itself in the following folders using different file names:

• %ProgramData%\Windows Error Sync\73g3qusq1.exe

(Note: %ProgramData% is the Program Data folder, where it usually is C:\Program Files in Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\ProgramData in Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

It drops the following files:

• %Application Data%\Microsoft\Crypto\RSA\{CLSID}\{random string}
• %ProgramData%\Windwos Error Sync\zsgarzgvp.txt

(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.. %ProgramData% is the Program Data folder, where it usually is C:\Program Files in Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\ProgramData in Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

It executes then deletes itself afterward.

Autostart Technique

This Trojan adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
CurrentVersion\Run
Windows Error Sync = "%ProgramData%\Windows Error Sync\73g7qusq1.exe"

HKEY_CURRENT_USER\Software\Microsoft\
CurrentVersion\RunOnce
Windows Error Sync = "%ProgramData%\Windows Error Sync\73g7qusq1.exe"

It adds the following Image File Execution Options registry entries to automatically execute itself whenever certain applications are run:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image Fike Execution Options\
rstrui,exe
Debugger = "rhaugkeldh.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image Fike Execution Options\
73g3qusq1.exe
DisableExceptionChainValidation = "{null}"

Other System Modifications

This Trojan adds the following registry keys:

KEY_CURRENT_USER\Software\AppDataLow\
Software\{GUID}\{random key}\
{random key}

It adds the following registry entries:

HKEY_CURRENT_USER\Software\AppDataLow\
Software\{GUID}\{random key}\
{random key}
{random value} = "{hex values}"

It creates the following registry entry(ies) to bypass Windows Firewall:

HKEY_LOCAL_MACHINE\ControlSet001\services\
SharedAccess\Parameters\FirewallPolicy\
StandardProfile
EnableFirewall = "0"

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

HKEY_LOCAL_MACHINE\ControlSet001\services\
SharedAccess\Parameters\FirewallPolicy\
PublicProfile
EnableFirewall = "0"

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

Other Details

This Trojan connects to the following possibly malicious URL:

• http://{BLOCKED}uptly.ru/logout.php