Analysis by: John Kevin Sanchez
 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Canal de infección Downloaded from the Internet

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 is capable of encrypting files in the affected system.

  TECHNICAL DETAILS

Tamaño del archivo 8,192 bytes
Tipo de archivo EXE
Fecha de recepción de las muestras iniciales 17 Nov 2016
Carga útil Encryps files

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:

  • %User Temp%\{random value}.exe

(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 drops the following file(s)/component(s):

  • %User Profile%\Desktop\HOW TO DECRYPT FILES.txt
  • %All Users Profile%\Microsoft\Windows\Start Menu\Programs\Startup\HOW TO DECRYPT FILES.txt
  • {folders containing encrypted files}\HOW TO DECRYPT FILES.txt

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.. %All Users Profile% is the All Users folder, where it usually is C:\Documents and Settings\All Users on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\ProgramData 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.)

Autostart Technique

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
Alcmeter = %User Temp%\{random value}.exe

Other System Modifications

This Trojan adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
.EnCiPhErEd
(Default) = "EADQEVCXIGGSVPB"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
EADQEVCXIGGSVPB
(Default) = "CRYPTED!"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
EADQEVCXIGGSVPB\DefaultIcon
(Default) = "%User Temp%\{random value}.exe,0"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
EADQEVCXIGGSVPB\shell\open\
command
(Default) = "%User Temp%\{random value}.exe"

Other Details

This Trojan renames encrypted files using the following names:

  • {original filename and extension}.EnCiPhErEd

It is capable of encrypting files in the affected system.