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RANSOM_HIDDENTEAROXAR.A

July 28, 2017
 Analysis by: Marvelous Pelin
 ALIASES:

Ransom.Oxar(Malwarebytes)

 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. It encrypts files found in specific folders.

  TECHNICAL DETAILS

File Size:

665,600 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

11 Jul 2017

Payload:

Displays message/message boxes, 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.

Installation

This Ransomware creates the following folders:

  • %User Profile%\AppData\Presector - (Hidden Attribute)

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)

It adds the following mutexes to ensure that only one of its copies runs at any one time:

  • 54GDFB54Vf45415BGD64F5V4C6554V6D5WX4151F65DS165FE1S6G4F81VER6SD5C165

Ransomware Routine

This Ransomware encrypts files with the following extensions:

    • *.7z
    • *.aif
    • *.apk
    • *.arj
    • *.asp
    • *.bat
    • *.bin
    • *.bin
    • *.cab
    • *.cda
    • *.cer
    • *.cfg
    • *.cfm
    • *.cpl
    • *.css
    • *.csv
    • *.cur
    • *.dat
    • *.deb
    • *.dmg
    • *.dmp
    • *.doc
    • *.docx
    • *.drv
    • *.gif
    • *.htm
    • *.html
    • *.icns
    • *.iso
    • *.jar
    • *.jpeg
    • *.jpg
    • *.js
    • *.jsp
    • *.log
    • *.mid
    • *.mp3
    • *.mp4
    • *.mpa
    • *.odp
    • *.ods
    • *.odt
    • *.ogg
    • *.part
    • *.pdf
    • *.php
    • *.pkg
    • *.png
    • *.png
    • *.png
    • *.ppt
    • *.pptx
    • *.ps
    • *.psd
    • *.py
    • *.py
    • *.rar
    • *.rpm
    • *.rss
    • *.rtf
    • *.sql
    • *.svg
    • *.tar.gz
    • *.tex
    • *.tif
    • *.tiff
    • *.toast
    • *.txt
    • *.vcd
    • *.wav
    • *.wks
    • *.wma
    • *.wpd
    • *.wpl
    • *.wps
    • *.wsf
    • *.xlr
    • *.xls
    • *.xlsx
    • *.z
    • *.zip
    • .jpg

It encrypts files found in the following folders:

  • %Desktop%
  • %User Profile%\Music
  • %User Profile%\Documents
  • %User Profile%\Pictures
  • %User Profile%\Videos
  • %User Profile%\Downloads
  • Removable Drives

(Note: %Desktop% is the desktop folder, where it usually is C:\Documents and Settings\{user name}\Desktop in Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\Desktop in Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.. %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)

It renames encrypted files using the following names:

  • {original filename and extension}.OXR

NOTES:

This ransomware displays the following after execution:

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

13.526.07

FIRST VSAPI PATTERN DATE:

11 Jul 2017

VSAPI OPR PATTERN File:

13.527.00

VSAPI OPR PATTERN Date:

12 Jul 2017

Step 1

Search and delete these folders

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.  
  • %User Profile%\AppData\Presector

Step 2

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 3

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 4

Restart in Safe Mode

[ Learn More ]

Step 5

Restart in normal mode and scan your computer with your Trend Micro product for files detected as RANSOM_HIDDENTEAROXAR.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 6

Restore encrypted files from backup.


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