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RANSOM_EDA2ENJEY.A

March 17, 2017
 Analysis by: John Anthony Banes
 ALIASES:

Ransom:Win32/FileCryptor (Microsoft); MSIL/Filecoder.AK!tr (Fortinet); TR/FileCoder.pasdd (Antivir)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • 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 executes then deletes itself afterward.

It is capable of encrypting files in the affected system.

  TECHNICAL DETAILS

File Size:

13,312 bytes

File Type:

, EXE

Memory Resident:

No

Initial Samples Received Date:

07 Mar 2017

Payload:

Encrypts 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 files:

  • C:\ProgramData\id.txt - contains username GUID
  • {path of encrypted files}\README_DECRYPT.txt - ransom note
  • {malware path}\~.bat - deletes malware and this batch file

It executes then deletes itself afterward.

Other Details

This Trojan renames encrypted files using the following names:

  • {original filename}.encrypted.contact_here_me@india.com.enjey

It does the following:

  • It deletes shadow copies by executing the following command:
    • vssadmin delete shadows /all /quiet
  • It avoids encrypting files in the following folders:
    • Program Files (x86)
    • $Recycle.Bin
    • Windows
    • Boot
    • System Volum Information
  • It is capable of sending the following information to a URL:
    • GUID
    • Username
  • It sends information to the following URL:
    • http://{BLOCKED}wallet.ru/css/add_text.php?data={random characters}={GUID}={username}
  • The ransom note contains the following message:

It is capable of encrypting files in the affected system.

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

13.268.08

FIRST VSAPI PATTERN DATE:

10 Mar 2017

VSAPI OPR PATTERN File:

13.269.00

VSAPI OPR PATTERN Date:

11 Mar 2017

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

Search and delete this file

[ Learn More ]
There may be some files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.  
  • C:\ProgramData\id.txt
  • {path of encrypted files}\README_DECRYPT.txt
  • {malware path}\~.bat

Step 4

Scan your computer with your Trend Micro product to delete files detected as RANSOM_EDA2ENJEY.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.

Step 5

Restore encrypted files from backup.


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