arrow_back
search
close

Ransom.MSIL.CRAPSOM.THCODBA

March 10, 2021
 Analysis by: Karen Ivy Titiwa
 ALIASES:

Trojan-Ransom.FileCrypter(IKARUS); Troj/Ransom-GFJ(SOPHOS_LITE)

 PLATFORM:

Windows

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

  • Threat Type: Ransomware

  • Destructiveness: No

  • Encrypted: Yes

  • 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 encrypts files found in specific folders.

  TECHNICAL DETAILS

File Size:

19,456 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

03 Mar 2021

Payload:

Displays message/message boxes, Encrypts files

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:

  • It displays the following as ransom note:
  • It displays the following when trying to exit the ransom note:
  • It deletes the encrypted files after clicking on the yes button then displays the following:

It terminates itself if any of the following file(s) are present:

  • C:\protect.dat

Ransomware Routine

This Ransomware encrypts files found in the following folders:

  • %User Profile%\Documents
  • %User Profile%\Desktop

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name} on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

It avoids encrypting files with the following strings in their file name:

  • desktop.ini
  • Thumbs.db

It appends the following extension to the file name of the encrypted files:

  • .crap

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

16.582.05

FIRST VSAPI PATTERN DATE:

08 Mar 2021

VSAPI OPR PATTERN File:

16.583.00

VSAPI OPR PATTERN Date:

09 Mar 2021

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.XXPE50FFF042

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

Scan your computer with your Trend Micro product to delete files detected as Ransom.MSIL.CRAPSOM.THCODBA. 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 4

Restore encrypted files from backup.


Did this description help? Tell us how we did.