Analysis by: Mark Joseph Manahan
ALIASES:

Mal/Ransom-CE (Sophos) ,Trojan horse SHeur4.BTUZ (AVG) ,W32/Inject.MJPQ!tr (Fortinet) ,Virus.Win32.CeeInject (Ikarus) ,Trojan.Win32.Inject.mjpq (Kaspersky) ,VirTool:Win32/CeeInject.gen!KK (Microsoft) ,a variant of Win32/Injector.BCDM trojan (Eset) ,Trojan.Win32.Generic!BT (Sunbelt)

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

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.

  TECHNICAL DETAILS

Tamaño del archivo 293,224 bytes
Tipo de archivo EXE
Fecha de recepción de las muestras iniciales 21 Apr 2014

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 files:

  • %Application Data%\OneClickRemSoftware\BitCrypt.bmp
  • %Application Data%\OneClickRemSoftware\del.bat
  • %Application Data%\OneClickRemSoftware\passworddata.ddb

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.)

It drops the following copies of itself into the affected system:

  • %Application Data%\OneClickRemSoftware\{random}.exe

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.)

It creates the following folders:

  • %Application Data%\OneClickRemSoftware

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.)

It leaves the following text files:

  • %Application Data%\OneClickRemSoftware\What_happened_with_your_files.txt
  • {Drive Letter}:\{folder path}\What_happened_with_your_files.txt

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.)

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
Bitcomint = "%ApplicationData%\OneClickSoftware\{random}.exe"

Other Details

This Trojan encrypts files with the following extensions:

  • *.abw
  • *.arj
  • *.asm
  • *.bpg
  • *.cdr
  • *.cdt
  • *.cdx
  • *.cer
  • *.css
  • *.dbf
  • *.dbt
  • *.dbx
  • *.dfm
  • *.djv
  • *.djvu
  • *.doc
  • *.docm
  • *.docx
  • *.dpk
  • *.dpr
  • *.frm
  • *.jpeg
  • *.jpg
  • *.key
  • *.lzh
  • *.lzo
  • *.mdb
  • *.mde
  • *.odc
  • *.pab
  • *.pas
  • *.pdf
  • *.pgp
  • *.php
  • *.pps
  • *.ppt
  • *.pst
  • *.rtf
  • *.sql
  • *.text
  • *.txt
  • *.vbp
  • *.vsd
  • *.wri
  • *.xfm
  • *.xlc
  • *.xlk
  • *.xls
  • *.xlsm
  • *.xlsx
  • *.xlw
  • *.xsf
  • *.xsn

It renames encrypted files using the following names:

  • {filename}.bitcrypt2