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RANSOM_CRYPT.THCBIAH

June 12, 2018
 Analysis by: Hazel Ann Poligratis
 ALIASES:

Ransom:Win32/Wadhrama.B (Microsoft), Trojan-Ransom.Win32.Cryptor.brm (Kaspersky)

 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 encrypts files found in specific folders.

  TECHNICAL DETAILS

File Size:

796,672 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

29 Mar 2018

Payload:

Encrypts files, Displays windows

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 encrypts files with the following extensions:

  • .txt
  • .png
  • .gif
  • .hwp
  • .doc
  • .pdf
  • .ppt
  • .jpg
  • .xls
  • .mp3

Ransomware Routine

This Ransomware encrypts files found in the following folders:

  • Folders and Sub-Folders found in Drive C:\

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

  • .crypt

NOTES:

It displays the following during encryption:

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

14.158.08

FIRST VSAPI PATTERN DATE:

29 Mar 2018

VSAPI OPR PATTERN File:

14.159.00

VSAPI OPR PATTERN Date:

30 Mar 2018

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

Restart in normal mode and scan your computer with your Trend Micro product for files detected as RANSOM_CRYPT.THCBIAH. 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 3

Restore encrypted files from backup.


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