RANSOM_STUPTRASH.A

March 21, 2017
 Analysis by: Ryan Paolo Maglaque
 ALIASES:

Ransom.Cryptolocker(Norton);Ransom:Win32/FileCryptor(Microsoft);MSIL/Filecoder.DP!tr(Fortinet)

 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, Dropped by other malware

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:

399,872 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

15 Mar 2017

Payload:

Encrypts files

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 renames encrypted files using the following names:

  • {Original File Name and Extension}.fucked

It does the following:

  • Requires the password "senamyrcq" to decrypt the files
  • Encrypts all files in "C:\Users\Enzo\Desktop\CLEUSBTESTRANSOM\" and its subdirectories
  • Display a window showing the files being encrypted.

  • Display the following Ransom Note after encrypting the files

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

13.284.02

FIRST VSAPI PATTERN DATE:

18 Mar 2017

VSAPI OPR PATTERN File:

13.285.00

VSAPI OPR PATTERN Date:

19 Mar 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_STUPTRASH.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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