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RANSOM_EDA2MASTERBUSTER.A

November 04, 2016
 Analysis by: Homer Pacag
 ALIASES:

Ransom:MSIL/Ryzerlo.A (Microsoft); a variant of MSIL/Filecoder.Z (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:

Dropped by other malware, Downloaded from the Internet


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 connects to a website to send and receive information. However, as of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size:

214,528 bytes

Memory Resident:

Yes

Initial Samples Received Date:

28 Oct 2016

Payload:

Connects to URLs/IPs, Opens Internet Explorer window, Displays message/message boxes

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:

  • {Malware Path}\READ_THIS_FILE_IMPORTANT.txt - ransom note in Sesothonian language

Backdoor Routine

This Trojan connects to the following websites to send and receive information:

  • http://{BLOCKED}t.{BLOCKED}z.lv/ddrt/write.php?info={Computer and Username}%20jN2C/4tCIL6rkAJHLwYxSw==%{Date Stamp}

However, as of this writing, the said sites are inaccessible.

NOTES:

This ransomware does not encrypt files on your computer.

It opens the notepad program to show the ransom note in Sesothonian language.

It also opens a browser (Internet Explorer) to access the File Recovery Process site: https://docs.{BLOCKED}e.com/forms/d/e/{BLOCKED}LScYhVc74rKqzYr-GW6-hyNDlfN8zU8XznDGRLUgtDZtLVw8sg/viewform

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

12.864.05

FIRST VSAPI PATTERN DATE:

28 Oct 2016

VSAPI OPR PATTERN File:

12.865.00

VSAPI OPR PATTERN Date:

29 Oct 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

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.  
  • {Malware Path}\READ_THIS_FILE_IMPORTANT.txt

Step 4

Scan your computer with your Trend Micro product to delete files detected as RANSOM_EDA2MASTERBUSTER.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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