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RANSOM_STUPFTS.A

May 16, 2017
 Analysis by: Marvelous Pelin
 ALIASES:

Trojan.Ransom.Stupid(ALYac)

 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 with specific file extensions.

  TECHNICAL DETAILS

File Size:

194,048 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

05 May 2017

Payload:

Terminates processes, 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.

Process Termination

This Ransomware terminates the following processes if found running in the affected system's memory:

  • taskmgr
  • explorer

Other Details

This Ransomware does the following:

  • This ransomware does not encrypt files and folders that ends with the following strings:
    • .old
    • Bin
    • boot
    • cache
    • efi
    • indows
    • rogram Files
    • rogram Files (x86)
    • System Volume Information
    • tings
    • very
  • It avoids encrypting files with the following extension:
    • .fucked

Ransomware Routine

This Ransomware encrypts files with the following extensions:

  • .3gp
  • .ahok
  • .apk
  • .asp
  • .aspx
  • .avi
  • .doc
  • .docx
  • .encrypt
  • .flac
  • .html
  • .jpeg
  • .jpg
  • .MOV
  • .mp3
  • .mp4
  • .php
  • .png
  • .ppt
  • .pptx
  • .psd
  • .rar
  • .raw
  • .txt
  • .wav
  • .wma
  • .wmv
  • .xls
  • .xlsx
  • .zip
  • crypted

It renames encrypted files using the following names:

  • {original filename and extension}.fucked

NOTES:

It locks the screen and display the following window:

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

13.384.05

FIRST VSAPI PATTERN DATE:

05 May 2017

VSAPI OPR PATTERN File:

13.385.00

VSAPI OPR PATTERN Date:

06 May 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

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

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


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