TSPY_ZBOT.YJKS

This spyware arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

However, as of this writing, the said sites are inaccessible.

Arrival Details

This spyware 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 spyware drops the following files:

• %Windows%\Tasks\Security Center Update - {random number}.job

(Note: %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)

It drops the following copies of itself into the affected system:

• %Application Data%\{random folder name}\{random filename 1}.exe
• %System%\{random filename 2}.exe

(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.. %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

It creates the following folders:

• %Application Data%\{random folder name}

(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.)

Autostart Technique

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{random name} = "%Application Data%\{random folder name}\{random filename 1}.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
{random name} = "%Application Data%\{random folder name}\{random filename 1}.exe"

It registers its dropped component as a system service to ensure its automatic execution at every system startup. It does this by creating the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SecurityCenterServer{random number}
ImagePath = "%Application Data%\{random folder name}\{random filename 1}.exe"

It registers its dropped component as a system service to ensure its automatic execution at every system startup. It does this by creating the following registry keys:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SecurityCenterServer{random number}

Other System Modifications

This spyware adds the following registry keys:

HKEY_CURRENT_USER\Software\{random key name}

Other Details

This spyware connects to the following possibly malicious URL:

• http://{BLOCKED}izzaro.com/b/eve/0a4f60bec6b844ca8366b7f9
• http://{BLOCKED}izzaro.com/b/opt/1A0D813A40AD83078C5AA773
• http://{BLOCKED}izzaro.com/b/opt/24D979E1282D35F6E4DA1182
• http://{BLOCKED}izzaro.com/b/opt/2E2862742B2D7D56E7DA5922
• http://{BLOCKED}izzaro.com/b/opt/41828FCFF2155E663EE27A12
• http://{BLOCKED}izzaro.com/b/opt/57E95AA31398A551DF6F8125

However, as of this writing, the said sites are inaccessible.