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Ransom.MSIL.BB.A

April 02, 2020
 Analysis by: Kennard Yap
 PLATFORM:

Windows

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

  • Threat Type: Ransomware

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware


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.

  TECHNICAL DETAILS

File Size:

178,176 bytes

File Type:

EXE

Memory Resident:

Yes

Payload:

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.

Other Details

This Ransomware does the following:

  • Encrypts all files found in %User Profile%\Pictures
  • Displays the following as ransom note:

    • Upon clicking the "Decrypt File" button with the file path to decrypt, it will ask for a code:

      • If the user provides the right code (2101), it will attempt to decrypt the file and will display the following:
        • Successfully decrypted:

        • Failed to decrypt:

      • If the user provides the wrong code it will display the following:

    • Upon clicking the "Get me a decrypt code (check payment)" button, it will display a progress bar that loads to 80% and will display a messege box:

  • The decrypted file is corrupted/damaged due to improper decryption.

Ransomware Routine

This Ransomware appends the following extension to the file name of the encrypted files:

  • encryptedbyBB

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

15.778.02

FIRST VSAPI PATTERN DATE:

30 Mar 2020

VSAPI OPR PATTERN File:

15.779.00

VSAPI OPR PATTERN Date:

31 Mar 2020

Step 1

Trend Micro Predictive Machine Learning detects and blocks malware at the first sign of its existence, before it executes on your system. When enabled, your Trend Micro product detects this malware under the following machine learning name:

     
    • Troj.Win32.TRX.XXPE50FFF034

Step 2

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 3

Identify and terminate files detected as Ransom.MSIL.BB.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

Scan your computer with your Trend Micro product to delete files detected as Ransom.MSIL.BB.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 5

Restore encrypted files from backup.


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