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RANSOM_GANSTA.A

July 11, 2017
 Analysis by: Ryan Paolo Maglaque
 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:

Dropped by other malware, 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:

21,504 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

18 Jun 2017

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:

  • Execute the command cmd /c cacls {Documents folder} /t /e /g Everyone:f ← Modify discretionary access control list

  • Displays the following window:

  • Decrypt tab of the window:

Ransomware Routine

This Ransomware encrypts files found in the following folders:

  • MyPictures

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

  • .enc

NOTES:

This ransomware has error in its code -- it fails to encrypt files.

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

13.482.07

FIRST VSAPI PATTERN DATE:

20 Jun 2017

VSAPI OPR PATTERN File:

13.483.00

VSAPI OPR PATTERN Date:

21 Jun 2017

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

Scan your computer with your Trend Micro product to delete files detected as RANSOM_GANSTA.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 3

Restore encrypted files from backup.


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