➔
search
✕

RANSOM_CRYPEXTXX.A

February 10, 2017
 Analysis by: David John Agni
 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet


This Trojan 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:

314,368 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

16 Dec 2016

Payload:

Encrypts files, Displays windows

Arrival Details

This Trojan 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 Trojan encrypts files with the following extensions:

  • .zip
  • .rar
  • .txt
  • .pdf

It renames encrypted files using the following names:

  • {Host Filename}.xxx

It does the following:

  • It opens a command window where it writes the following information regarding its encryption routine:
    • List of files to encrypt
    • Number of files to encrypt
    • Per file encryption result

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

13.106.03

FIRST VSAPI PATTERN DATE:

16 Dec 2016

VSAPI OPR PATTERN File:

13.107.00

VSAPI OPR PATTERN Date:

17 Dec 2016

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

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

Scan your computer with your Trend Micro product to delete files detected as RANSOM_CRYPEXTXX.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 this Knowledge Base page for more information.

Step 4

Restore encrypted files from backup.


Did this description help? Tell us how we did.