➔
search
✕

RANSOM_CRYPTEAR.A

August 19, 2015
 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

Infection Channel:

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

File Size:

211,968 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

18 Aug 2015

Payload:

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

Minimum Scan Engine:

9.750

FIRST VSAPI PATTERN FILE:

11.862.05

FIRST VSAPI PATTERN DATE:

18 Aug 2015

VSAPI OPR PATTERN File:

11.863.00

VSAPI OPR PATTERN Date:

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.


Did this description help? Tell us how we did.