Analysis by: Homer Pacag
ALIASES:

Luhe.Fiha.A (AVG)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Canal de infección Downloaded from the Internet, Dropped by other malware

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 gathers certain information on the affected computer.

  TECHNICAL DETAILS

Tamaño del archivo 211,968 bytes
Tipo de archivo EXE
Residente en memoria No
Fecha de recepción de las muestras iniciales 18 Aug 2015
Carga útil Encrypts files, Connects to URLs/IPs

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:

  • %Desktop%\READ_IT.txt - ransom note

(Note: %Desktop% is the desktop folder, where it usually is C:\Documents and Settings\{user name}\Desktop in Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\Desktop in 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.)

Information Theft

This Trojan gathers the following information on the affected computer:

  • Machine Name
  • User Name

NOTES:

This ransomware connects to the following website to send information:

  • http://www.{BLOCKED}n.com/hidden-tear/write.php?info={MachineName}-{UserName}%20{Generated Password for decryption}

It encrypts files with the following extensions in the %User Profile% sub folders and appends .locked as the new file extension of the encrypted files:

  • .txt
  • .doc
  • .docx
  • .xls
  • .xlsx
  • .ppt
  • .pptx
  • .odt
  • .jpg
  • .png
  • .csv
  • .sql
  • .mdb
  • .sln
  • .php
  • .asp
  • .aspx
  • .html
  • .xml
  • .psd

Below is the message contained in READ_IT.txt:

  SOLUTION

Motor de exploración mínimo 9.750
Primer archivo de patrones de VSAPI 11.862.05
Primera fecha de publicación de patrones de VSAPI 18 Aug 2015
Versión de patrones OPR de VSAPI 11.863.00
Fecha de publicación de patrones OPR de VSAPI 19 Aug 2015

Scan your computer with your Trend Micro product to delete files detected as RANSOM_CRYPTEAR.A. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.


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