TROJ_ROVNIX.YPPM

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.

It executes then deletes itself afterward.

It does not have any propagation routine.

It does not have any backdoor routine.

It modifies the Internet Explorer Zone Settings.

As of this writing, the said sites are inaccessible.

It connects to certain websites to send and receive information. It gathers information and reports it to its servers.

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 a copy of itself in the following folders using different file names:

• "%Application Data%\BackUp{Volume ID}.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 file(s)/component(s):

• %User Temp%\L{Volume ID}
• %User Temp%\NTFS.sys
• %User Temp%\tmp{random characters}.tmp
• %System%\BOOT.dat

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

It executes then deletes itself afterward.

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

• Global\INSNTFS{Volume ID}
• Global\UACNTFS{Volume ID}
• Global\BDNTFS{Volume ID}

Autostart Technique

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
BackUp{Volume ID} = "%Application Data%\BackUp{Volume ID}.exe"

It adds and runs the following services:

• Service Name: BS{Volume ID}
  Display Name: BS{Volume ID}
  Start Type: SERVICE_DEMAND_START
  Binary Pathname: %User Temp%\NTFS.sys

(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.)

Other System Modifications

This Trojan adds the following registry entries:

HKEY_CURRENT_USER\Software\Sysinternals\
C
EulaAccepted = "1"

HKEY_CURRENT_USER\Software\Microsoft\
Installer\Products\B{Volume ID}
LP = "%User temp%\L{Volume ID}"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
RSA{Volume ID} = "%System%\rundll32.exe "%Application Data%\Microsoft\Crypto\RSA\RSA{Volume ID}.dll",DllInitialize

HKEY_CURRENT_USER\Software\Microsoft\
Installer\Products\B{Volume ID}
ID = "-- default --"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Disk Defragmenter = "%System%\rundll32.exe "%Application Data%\defragsvc.dll",DllInitialize"

Propagation

This Trojan does not have any propagation routine.

Backdoor Routine

This Trojan does not have any backdoor routine.

Process Termination

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

• iexplore.exe

Web Browser Home Page and Search Page Modification

This Trojan modifies the Internet Explorer Zone Settings.

Download Routine

This Trojan accesses the following websites to download files:

• http://{BLOCKED}all.com/18725640.zip

It saves the files it downloads using the following names:

• %Application Data%\Microsoft\Crypto\RSA\RSA{Volume ID}.dll
• %Application Data%\defragsvc.dll

(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.)

As of this writing, the said sites are inaccessible.

Other Details

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

• http://{BLOCKED}all.com/cgi-bin/160116/post.cgi

It checks for the presence of the following process(es):

• explorer.exe

It does the following:

• It modifies the NTFS boot sector to load its encrypted code
• Terminates itself if Hard Disk is Protected and/or Encrypted by any of the following:
  • BitLocker
  • VeraCrypt
  • TrueCrypt
• Can Log off Current User
• Deletes the files inside %User Temp% folder
• Terminates itself if the malware name and/or path has the following substrings:
  • samp
  • smpl
  • vir
  • malw
  • test
  • troj
• Can do any of the following depending on the installation date of "%System%\win32k.sys":
  • Create svchost process with this argument "-1 EVT{Volume ID}"
  • Inject codes to created svchost.exe
  • Create a window with a random class name

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

It terminates itself if any of the following user name(s) are found in the affected system:

• luser
• perl
• python
• trace
• dump

It gathers the following information and reports it to its servers:

• Malware ID
• Filepath and Name of the log file
• OS Version and Architecture
• File System
• Volume ID
• System Date and Time
• Child Process ID
• Child Filepath and Filename
• Parent Process ID
• Parent Filepath and Filename
• Current Malware Directory
• Username
• SID SubAuthority Level