Ransom.Win32.LAUGHCRYPT.A

January 16, 2021
 Analysis by: Bren Matthew Ebriega
 ALIASES:

Ransom:Win32/FileCryptor.PK!MTB (MICROSOFT); Malicious_Behavior.SB (FORTINET)

 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 with specific file extensions.

  TECHNICAL DETAILS

File Size:

903,680 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

07 Jan 2021

Payload:

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 encrypts FIXED and REMOVABLE drives.

Ransomware Routine

This Ransomware encrypts files with the following extensions:

  • .txt
  • .RTF
  • .doc
  • .jpg
  • .rar
  • .zip

It renames encrypted files using the following names:

  • {Original Filename}.HaHaHaHaHaHaHaHa

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

16.478.08

FIRST VSAPI PATTERN DATE:

15 Jan 2021

VSAPI OPR PATTERN File:

16.479.00

VSAPI OPR PATTERN Date:

16 Jan 2021

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

Scan your computer with your Trend Micro product to delete files detected as Ransom.Win32.LAUGHCRYPT.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 3

Restore encrypted files from backup.


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