TSPY_EMOTET.WJSX

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 connects to certain websites to send and receive information. 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 copies of itself into the affected system and executes them:

• %Application Data%\Identities\{random filename}.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.)

It drops the following component file(s):

• %Application Data%\ms{random numbers}.bat - used to delete initially executed copy

(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.)

It adds the following mutexes to ensure that only one of its copies runs at any one time:

• ci{process ID of injected explorer.exe in hex}
• cm{process ID of injected explorer.exe in hex}
• rm{random}
• qazwsxedc

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
{random filename}.exe = "%Application Data%\Identities\{random filename}.exe"

Other System Modifications

This spyware adds the following registry keys:

HKEY_CURRENT_USER\Software\Netscape\
5.0\{random}\{random}

HKEY_CURRENT_USER\Software\????????????????????????????????????????????????

Information Theft

This spyware gathers the following data:

• computer name
• country
• volume information
• operating system

Other Details

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

• http://{BLOCKED}.{BLOCKED}.26.52:8080/{random}/{random}/
• http://{BLOCKED}.{BLOCKED}.86.207:8080/{random}/{random}/
• http://{BLOCKED}.{BLOCKED}.123.186:8080/{random}/{random}/
• http://{BLOCKED}.{BLOCKED}.170.164:8080/{random}/{random}/
• http://{BLOCKED}.{BLOCKED}.220.50:8080/{random}/{random}/
• http://{BLOCKED}.{BLOCKED}.17.185:8080/{random}/{random}/
• http://{BLOCKED}.{BLOCKED}.199.119:8080/{random}/{random}/
• http://{BLOCKED}.{BLOCKED}.174.144:8080/{random}/{random}/
• http://{BLOCKED}.{BLOCKED}.249.53:8080/{random}/{random}/
• http://{BLOCKED}.{BLOCKED}.59.161:8080/{random}/{random}/
• http://{BLOCKED}.{BLOCKED}.169.146:8080/{random}/{random}/
• http://{BLOCKED}.{BLOCKED}.162.180:8080/{random}/{random}/
• http://{BLOCKED}.{BLOCKED}.111.17:8080/{random}/{random}/
• http://{BLOCKED}.{BLOCKED}.1.22:8080/{random}/{random}/
• http://{BLOCKED}.{BLOCKED}.231.167:8080/{random}/{random}/
• http://{BLOCKED}.{BLOCKED}.54.24:8080/{random}/{random}/
• http://{BLOCKED}.{BLOCKED}.99.214:8080/{random}/{random}/
• http://{BLOCKED}.{BLOCKED}.59.191:8080/{random}/{random}/
• http://{BLOCKED}.{BLOCKED}.110.43:8080/{random}/{random}/
• http://{BLOCKED}.{BLOCKED}.24.35:8080/{random}/{random}/
• http://{BLOCKED}.{BLOCKED}.174.192:8080/{random}/{random}/
• http://{BLOCKED}.{BLOCKED}.213.92:8080/{random}/{random}/

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

NOTES:

This spyware accesses the sites to post gathered information and download arbitrary files to be executed.