TSPY_URSNIF.YYSUV

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 listens on ports. It connects to a website to send and receive information.

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_DRIDEX.YYSVD

Installation

This spyware drops and executes the following files:

• %User Temp%\{random folder name}\{random filename}.bat ← use to delete itself; deleted afterwards

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp 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 drops the following copies of itself into the affected system:

• %Application Data%\{string1}{string2}\{string1}{string2}.exe
  where:
  {string1} = first four letters of a dll file under %System% directory
  {string2} = last four letters of a dll file under %System% directory

(Note: %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%\{string1}{string2}\
  where:
  {string1} = first four letters of a dll file under %System% directory
  {string2} = last four letters of a dll file under %System% directory
• %User Temp%\{random folder}

(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.. %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp 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
{string1}{string2} = "%User Profile%\{string1}{string2}\{string1}{string2}.exe"

Other System Modifications

This spyware adds the following registry keys:

HKEY_CURRENT_USER\Software\AppDataLow\
Software\Microsoft\{random GUID}

It adds the following registry entries:

HKEY_CURRENT_USER\Software\AppDataLow\
Software\Microsoft\{random GUID}
Install = "{encrypted file path of the dropped copy}"

HKEY_CURRENT_USER\Software\AppDataLow\
Software\Microsoft\{random GUID}
Client = "{hex value}"

HKEY_CURRENT_USER\Software\AppDataLow\
Software\Microsoft\{random GUID}
{random values} = "{random values}"

Backdoor Routine

This spyware listens on the following port(s):

• 0.0.0.0:49185

It connects to the following websites to send and receive information:

• {BLOCKED}wallowallowjcli.me
• {BLOCKED}scuserallow.pw

Download Routine

This spyware downloads an updated copy of itself from the following website(s):

• {BLOCKED}.{BLOCKED}.164.51 using port 9293

Information Theft

This spyware gathers the following data:

• Online banking credentials
• Keystroke logs

Other Details

This spyware deletes itself after execution.