TROJ_SHARIK.YUYMH

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. 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:

• %Application Data%\Microsoft\{Random 1}\{Random 2}.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 files:

• %Application Data%\Microsoft\{Random 1}\{Random 1}
• %User Temp%\{Random 3}.tmp.exe -> will be moved and renamed as %AppDataLocal%\{Random 4}.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.. %AppDataLocal% is the Application Data folder found in Local Settings, where it is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local 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 and executes the following files:

• %AppDataLocal%\{Random 4}.exe
• %User Temp%\{Random 5}.tmp\wuauclt.exe -> detected as Coinminer-TOOLETN.A-WIN32 (for 32 bit systems)
• %User Temp%\{Random 5}.tmp\wuauclt.exe -> detected as Coinminer-TOOLETN.A-WIN64 (for 64 bit systems)

(Note: %AppDataLocal% is the Application Data folder found in Local Settings, where it is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local 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.. %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 adds the following processes:

• explorer.exe
• "%User Temp%\{Random 5}.tmp\wuauclt.exe" -o stratum+tcp://etn-eu1.nanopool.org:13333 -u etnkQr8x5xY7PyUNi8jmxefg7YjQeceeGQgkmqZAyEofjVqR5GBp5ueHWDrrn87zHP8eew3ynA2pZN9zdL5a6rBs5BCgEaEpYu -p x --safe

(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 folders:

• %Application Data%\Microsoft\{Random 1}
• %User Temp%\{Random 5}.tmp

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

• hashed computer name and volume serial number

It injects threads into the following normal process(es):

• created explorer.exe

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
{installed program name in the system} = "%Application Data%\Microsoft\{Random 1}\{Random 2}.exe"

Process Termination

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

• Specific programs related to process and network monitoring, and debugging

Other Details

This Trojan connects to the following URL(s) to check for an Internet connection:

• http://www.bing.com

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

• {BLOCKED}ov.{BLOCKED}/15022018/
• {BLOCKED}.{BLOCKED}/15022018/

It does the following:

• It performs several checks before performing its malicious routines:
  • The following flags of its PEB structure must not indicate that it is being debugged:
    • IsDebugging
    • NtGlobalFlag
  • Module filename must not contain the string “sample"
  • Volume serial number should not be:
    • 0xCD1A40 (ThreatExpert)
    • 0x70144646 (Malwr)
  • Registry data under HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Disk\Enum must not contain the following strings:
    • qemu
    • virtual
    • vmware
    • xen
    • fffcce24 (VBox)
  • The following modules should not be loaded:
    • dbghelp
    • sbiedll

It deletes the initially executed copy of itself