Modified by: Francis Xavier Antazo
ALIASES:

Worm:Win32/Tempedreve.A (MICROSOFT), a variant of Win32/Kryptik.CTYE trojan (NOD32)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Spyware

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This spyware arrives via removable drives. It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

  TECHNICAL DETAILS

File Size: 249,344 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 06 Feb 2015

Arrival Details

This spyware arrives via removable drives.

It 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 spyware adds the following folders:

  • %Application Data%\{random folder name 1}\

(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 copies of itself into the affected system:

  • %Application Data%\{random folder name 1}\{random file name 1}.exe
  • %System%\{random file name 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.. %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

Autostart Technique

This spyware registers itself as a system service to ensure its automatic execution at every system startup by adding the following registry entries:

HKEY_LOCAL_MACHINE\System\CurrentControlSet\
Services\{random file name 2}
ImagePath = "%System%\{random file name 2}.exe -s"

HKEY_LOCAL_MACHINE\System\CurrentControlSet\
Services\{random file name 2}
DisplayName = "{random file name 2}"

HKEY_LOCAL_MACHINE\System\CurrentControlSet\
Services\{random file name 2}
Description = "{random file name 2}"

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{random value 1} = "%Application Data%\{random folder name 1}\{random file name 1}.exe"

It registers as a system service to ensure its automatic execution at every system startup by adding the following registry keys:

HKEY_LOCAL_MACHINE\System\CurrentControlSet\
Services\{random file name 2}

Propagation

This spyware drops copies of itself in the following drives:

  • removable drives
  • network drives

It drops copies of itself in network drives such as the following:

  • {drive letter}:\Temp.exe

It drops the following copy(ies) of itself in all removable drives:

  • {drive letter}:\Temp.exe