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Ransom.BAT.MORRISBATCHCRYPT.A

February 25, 2020
 Analysis by: Joshua John Bantayan
 ALIASES:

BAT/Filecoder.DC trojan (NOD32); Trojan.BAT.Agent.NS (BITDEFENDER)

 PLATFORM:

Windows

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

  • Threat Type: Ransomware

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet

This Ransomware 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 drops files as ransom note. It avoids encrypting files with the following file extensions.

  TECHNICAL DETAILS

File Size:

2,299 bytes

File Type:

BAT

Memory Resident:

No

Initial Samples Received Date:

24 Feb 2020

Payload:

Encrypts files, Displays message/message boxes

Arrival Details

This Ransomware 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 Ransomware drops the following files:

  • {filename of encrypted file}.bin – encryption key, deleted after
  • { filename of encrypted file }.bin.info@saveuto[dot]com

It executes then deletes itself afterward.

Ransomware Routine

This Ransomware avoids encrypting files found in the following folders:

  • %Windows%

(Note: %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)

It drops the following file(s) as ransom note:

  • {Encrypted Directory}\help to decrypt.html

It avoids encrypting files with the following file extensions:

  • .exe
  • .dll
  • .sys
  • .lnk
  • .info@saveuto[dot]com

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

15.704.06

FIRST VSAPI PATTERN DATE:

24 Feb 2020

VSAPI OPR PATTERN File:

15.705.00

VSAPI OPR PATTERN Date:

25 Feb 2020

Step 1

Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 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

Identify and terminate files detected as Ransom.BAT.MORRISBATCHCRYPT.A

[ Learn More ]
  1. Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
  2. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  3. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

Step 4

Search and delete these files

[ 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.
  • {filename of encrypted file}.bin.info@saveuto[dot]com
  • {Encrypted Directory}\help to decrypt.html

Step 5

Scan your computer with your Trend Micro product to delete files detected as Ransom.BAT.MORRISBATCHCRYPT.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 the following Trend Micro Support pages for more information:

Step 6

Restore encrypted files from backup.


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