TROJ_JAKU.D

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 connects to certain websites to send and receive information. However, as of this writing, the said sites are inaccessible. It deletes the initially executed copy of itself.

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

• %Program Files%\Common Files\Services\CompSvc.exe

(Note: %Program Files% is the Program Files folder, where it usually is C:\Program Files on all Windows operating system versions; C:\Program Files (x86) for 32-bit applications running on Windows 64-bit operating systems.)

It drops the following files:

• %User Temp%\{Random}.txt -> contains stolen information
• %User Temp%\{Random}.ifo -> gzip compressed file of {Random}.txt
• %System%\sysprep\cryptbase.dll -> used for escalating permissions (if not admin)
• %User Temp%\{Random Name}.dll -> copy of cryptbase.dll (if not admin)

(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:

• %Program Files%\Common Files\Services\SvcStart.exe

(Note: %Program Files% is the Program Files folder, where it usually is C:\Program Files on all Windows operating system versions; C:\Program Files (x86) for 32-bit applications running on Windows 64-bit operating systems.)

It adds the following processes:

• explorer.exe
• "%Program Files%\Common Files\Services\SvcStart.exe" R2D2{Malware Location}\{Malware Name}.exe
• %System%\sysprep\sysprep.exe -> used for escalating permissions (if not admin)

(Note: %Program Files% is the Program Files folder, where it usually is C:\Program Files on all Windows operating system versions; C:\Program Files (x86) for 32-bit applications running on Windows 64-bit operating systems.. %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

Autostart Technique

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{4C2830A1-7D22-4f20-ADA2-3901BD61DDE4}
StubPath = "%Program Files%\Common Files\Services\SvcStart.exe"

Other System Modifications

This Trojan deletes the following files:

• %System%\sysprep\cryptbase.dll
• %User Temp%\{Random Name}.dll

(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.)

Download Routine

This Trojan downloads the file from the following URL and renames the file when stored in the affected system:

• http://{BLOCKED}.{BLOCKED}.96.222/css/CaC.php

It saves the files it downloads using the following names:

• %User Temp%\tmp{4 Random Characters}.tmp

(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.)

Information Theft

This Trojan gathers the following data:

• Computer Name
• OS Version
• IP Address
• Domain Name

Other Details

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

• http://{BLOCKED}.{BLOCKED}.96.222/css/CaC.php

It does the following:

• SvcStart.exe could use the following arguments:
  • SvcStart.exe R2D2{File}
    • delete {File}
  • SvcStart.exe R2D3{File}
    • drop and execute exp.bat
    • exp.bat does the following:
      • delete {File}
      • delete SvcStart.exe
      • delete itself
• It uses the following AntiAV techniques:
  • Searches for the following Mutex to check if Bitdefender is installed:
    • BDAgent-oneinstance-mutex
  • Searches for the following Event to check if AVG is installed:
    • AVG{53036606-6F17-41a9-80DD-AB930D6BA4DD}

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

It deletes the initially executed copy of itself