TSPY_DRIDEX.WW

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. It may be downloaded from remote sites by other malware.

It connects to certain websites to send and receive information. It is used to load and execute a file. It deletes itself after execution.

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.

It may be downloaded from remote site(s) by the following malware:

• W2KM_DLOADR.WYG

Installation

This spyware drops the following copies of itself into the affected system and executes them:

• %AppDataLocal%\edg{number}.exe
• %AppDataLocal%\edg{number}.tmp - deleted afterwards

(Note: %AppDataLocal% is the Application Data folder found in Local Settings, where it is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local 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.)

It injects codes into the following process(es):

• explorer.exe

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
wmnotify = "rundll32.exe %Application Data%\{number}.tmp NotifierInit"
This autorun registry is added before the system shuts down

Other System Modifications

This spyware adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
CLSID\{GUID}\ShellFolder
{random} = "{encrypted}"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\SharedAccess\Parameters\
FirewallPolicy\FirewallRules
{hex value} = "v2.10|Action=Allow|Active=TRUE|Dir=In|Protocol=6|App=C:\Windows\Explorer.EXE|Name=Core Networking - Multicast Listener Done (ICMPv4-In)|"

Download Routine

This spyware saves the files it downloads using the following names:

• %AppDataLocal%\{number}.tmp - TSPY_DRIDEX.WW
  This file is moved to %Application Data%\{number}.tmp before the system shuts down

(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.)

Information Theft

This spyware gathers the following data:

• username
• computer name
• installation date

Other Details

This spyware connects to the following website to send and receive information:

• {BLOCKED}.{BLOCKED}.4.215:443
• {BLOCKED}.{BLOCKED}.203.165:80
• {BLOCKED}.{BLOCKED}.38.178:80
• {BLOCKED}.{BLOCKED}.64.172:443
• {BLOCKED}.{BLOCKED}.2.23:443
• {BLOCKED}.{BLOCKED}.18.85:80
• {BLOCKED}.{BLOCKED}.179.66:8080
• {BLOCKED}.{BLOCKED}.54.5:8080
• {BLOCKED}.{BLOCKED}.28.253:80

It is used to load and execute the following file:

• %AppDataLocal%\{number}.tmp
  executed using the following command:
  rundll32.exe %AppDataLocal%\{number}.tmp,NotifierInit

(Note: %AppDataLocal% is the Application Data folder found in Local Settings, where it is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local 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.)

It does the following:

• httpshots
• form grabbing
• clickshots
• site injections

It deletes itself after execution.

NOTES:

This malware will retrieve configuration file that contains the list of targeted banks. However, as of this writing, servers are inaccessible.