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RANSOM_CRYPEDA.A

June 11, 2016
 Analysis by: Homer Pacag
 ALIASES:

MSIL/Agent.RFK(ESET-NOD32);

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • 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:

180,736 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

06 Jun 2016

Payload:

Encrypts files, Connects to URLs/IPs, Steals information

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.

Download Routine

This Trojan connects to the following URL(s) to download its component file(s):

  • https://i.imgur.com/FuUsfxZ.jpg - will be used as ransom note

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://{BLOCKED}xawqm0x5bc5.esy.es/webpanel/createkeys.php - key generator
  • http://{BLOCKED}xawqm0x5bc5.esy.es/webpanel/savekey.php - saves the key

It encrypts files with the following extensions and appends .locked as the new file extension of the encrypted files:

  • .docx
  • .docm
  • .djvu
  • .epub
  • .html
  • .aspx
  • .phtml
  • .xlsx
  • .xlsm
  • .java
  • .resx
  • .php3

It displays the following ransom note:

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

12.572.09

FIRST VSAPI PATTERN DATE:

06 Jun 2016

VSAPI OPR PATTERN File:

12.573.00

VSAPI OPR PATTERN Date:

07 Jun 2016

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

Scan your computer with your Trend Micro product to delete files detected as RANSOM_CRYPEDA.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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