TROJ_ROVNIX.PC

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 may be downloaded by other malware/grayware from remote sites.

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 takes advantage of certain vulnerabilities. However, as of this writing, the said sites are inaccessible. 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.

It may be downloaded by the following malware/grayware from remote sites:

• JS_ROVNIX.D

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 drops and executes the following files:

• %Application Data%\Microsoft\Crypto\RSA\RSA{Volume ID}.dll <- component responsible for downloading other ROVNIX components

(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:

• 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.)

It creates the following registry entries to enable automatic execution of dropped component at every system startup:

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

Other System Modifications

This Trojan adds the following registry entries:

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

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

HKEY_CURRENT_USER\Software\Microsoft\
Installer\Products\B{Volume ID}
SH1 = "{C&C server}"

HKEY_CURRENT_USER\Software\Microsoft\
Installer\Products\B{Volume ID}
SH2 = "{C&C server}"

HKEY_CURRENT_USER\Software\Microsoft\
Installer\Products\B{Volume ID}
SH3 = "{C&C server}"

HKEY_CURRENT_USER\Software\Microsoft\
Installer\Products\B{Volume ID}\
PLUGIN
{CRC32 string} = "{Encrypted code of a binary file}"

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

• http://{BLOCKED}roke.com/17635908.zip

It connects to the following URL(s) to download its component file(s):

• http://{domain name}/download/{CRC32 String}32.zip

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}roke.com/cgi-bin/240216/post.cgi
• http://{domain name}/login.asp
• http://{domain name}/images/transparent.gif
• http://{domain name}/images/pixel.gif
• http://{domain name}/images/logout.gif
• Where {domain name} can be any of the following:
  • {BLOCKED}roke.com
  • {BLOCKED}roke2.com
  • {BLOCKED}roke3.com
  • {BLOCKED}atlyhwq.onion
  • {randomly generated domain}.ru
  • {randomly generated domain}.com
  • {randomly generated domain}.net
  • {randomly generated domain}.biz

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

• explorer.exe

It does the following:

• Can update C&C servers listed in registry
• Tries to modify the NTFS boot sector to save/load its encrypted code
• Checks if the Hard Disk is Protected and/or Encrypted by any of the following:
  • BitLocker
  • VeraCrypt
  • TrueCrypt
• Terminates itself if the malware name and/or path has the following substrings:
  • samp
  • smpl
  • vir
  • malw
  • test
  • troj
• Makes use of certain vulnerabilities depending on the installation date of win32k.sys file
• This malware check if the DNS server does not contain the following strings:
  • control
  • sink
  • hole
  • dynadot
  • block
  • malw
  • anti
  • googl
  • hack
  • trojan
  • abuse
  • virus
  • black
  • spam
• It can use TOR service by accessing the following server:
  • jn6srzbluatlyhwq.onion
• It connects to the following NTP server:
  • 0.de.pool.ntp.org
  • 0.lu.pool.ntp.org
  • ntp1.stratum2.ru
• It creates named pipe\.\pipe\vhost{Volume ID}

It takes advantage of the following vulnerabilities:

• (MS13-053) Vulnerabilities in Windows Kernel-Mode Drivers Could Allow Remote Code Execution (2850851)
• (MS14-058) Vulnerabilities in Kernel-Mode Driver Could Allow Remote Code Execution (3000061)
• (MS15-051) Vulnerabilities in Windows Kernel-Mode Drivers Could Allow Elevation of Privilege (3057191)
• (MS15-077) Vulnerability in ATM Font Driver Could Allow Elevation of Privilege (3077657)

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

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