BKDR64_WINNTI.CH

This backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Arrival Details

This backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Dropping Routine

This backdoor drops the following files:

• %System%\assocnet.inf

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

Other Details

This backdoor does the following:

• Copies the file time of calc.exe or mspaint.exe
• Queries Volume Information
• Enumerates active session
• Adjust Privilege
• GetComputerName
• UserName
• System's Locale
• Get OS version
• GetMemory Status
• Backdoor Commands:
  • Gathers the following:
  Drive name
  Drive Type
  Volume name
  Total number of bytes available
  Total number of bytes
  • Search Files and gets the following:
  Creation Time
  Last AccessTime
  Last Write Time
  File Attributes
  • Move file to following:
  {path}\{Folder name}\{random numbers1}-{random numbers2}-{random numbers3}-{random numbers4}.bak
  %System%\{random numbers1}-{random numbers2}-{random numbers3}-{random numbers4}.bak
  • Create Temp File %User Temp%\PCH{tempname}
  • Connect to an IP
  • Execute File
  • Drop INF file
  • Execute commands
  • Elevate Privilage

  (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.)

  NOTES:
  

  This backdoor requires its main component to register this malware as a service.