TROJ_NITOL.EC

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.

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 file(s)/component(s):

• %User Temp%\SOFTWARE.LOG
• %System%\{random}.exe

(Note: %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, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.. %System% is the Windows system folder, which is usually C:\Windows\System32.)

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

• %System%\hra{random number}.dll

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)

Other System Modifications

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

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Distribuaav
Description = "Distribusda Transaction Coordinator Service"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Distribuaav
Start = "2"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Distribuaav
Type = "10"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Distribuaav
ErrorControl = "0"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Distribuaav
ImagePath = "%System%\{random}.exe"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Distribuaav
DisplayName = "Distribuqxb Transaction Coordinator Service"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Distribuaav
ObjectName = "LocalSystem"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Distribuaav
Description = "Distribusda Transaction Coordinator Service"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Enum\Root\LEGACY_DISTRIBUAAV
NextInstance = "1"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Enum\Root\LEGACY_DISTRIBUAAV\
0000
Service = "Distribuaav"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Enum\Root\LEGACY_DISTRIBUAAV\
0000
Legacy = "1"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Enum\Root\LEGACY_DISTRIBUAAV\
0000
ConfigFlags = "0"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Enum\Root\LEGACY_DISTRIBUAAV\
0000
Class = "LegacyDriver"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Enum\Root\LEGACY_DISTRIBUAAV\
0000
ClassGUID = "{8ECC055D-047F-11D1-A537-0000F8753ED1}"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Enum\Root\LEGACY_DISTRIBUAAV\
0000
DeviceDesc = "Distribuqxb Transaction Coordinator Service"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Enum\Root\LEGACY_DISTRIBUAAV\
0000\Control
*NewlyCreated* = "0"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Enum\Root\LEGACY_DISTRIBUAAV\
0000\Control
ActiveService = "Distribuaav"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Distribuaav\Security
Security = "{random values}"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Distribuaav\Enum
0 = "Root\LEGACY_DISTRIBUAAV\0000"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Distribuaav\Enum
Count = "1"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Distribuaav\Enum
NextInstance = "1"

Process Termination

This Trojan terminates the following processes if found running in the affected system's memory:

• ZhuDongFangYu.exe

Other Details

This Trojan connects to the following possibly malicious URL:

• http://{BLOCKED}6.3322.org/

Mobile Malware Routine

This Trojan opens the following port(s):

• 688