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RANSOM_HIDDENTEARSARAMAT.A

September 15, 2017
 Analysis by: Oliver Ramirez
 ALIASES:

Ransom:MSIL/Ryzerlo.A (Microsoft); Gen:Variant.MSILPerseus.96004 (BITFENDER); Troj/Cryptear-A (SOPHOS_LITE)

 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

This Ransomware encrypts files with specific file extensions. It encrypts files found in specific folders. It drops files as ransom note.

  TECHNICAL DETAILS

File Size:

78,336 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

04 Sep 2017

Payload:

Creates files, Displays message/message boxes, Encrypts files

Installation

This Ransomware drops the following copies of itself into the affected system:

  • {Drive Letter}:\Attention!.Exe
  • %Desktop%\Attention!.Exe

(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.)

Ransomware Routine

This Ransomware encrypts files with the following extensions:

  • .txt
  • .doc
  • .docx
  • .mp3
  • .xls
  • .xlsx
  • .ppt
  • .sql
  • .wmv
  • .mp4
  • .mp3
  • .iso
  • .dll
  • .jar
  • .pptx
  • .odt
  • .jpg
  • .tar
  • .gz
  • .bmp
  • .pbm
  • .rtf
  • .png
  • .csv
  • .sql
  • .mdb
  • .sln
  • .php
  • .avi
  • .mov
  • .flv
  • .amv
  • .mpv
  • .mtv
  • .asp
  • .aspx
  • .html
  • .xml
  • .psd
  • .pdf
  • .exe
  • .rv
  • .rvx
  • .ved
  • .wm
  • .wmv
  • .TXT
  • .JPG
  • .rar
  • .xwmv
  • .wma
  • .midi
  • .fla
  • .pdf
  • .wma
  • .ico
  • .gif
  • .GIF
  • .ogg
  • .mpg
  • .icns
  • .RAR
  • .png
  • .zip
  • .BAT
  • .Exe
  • .c
  • .exe
  • .PNG
  • .iso
  • .7z
  • .7Z
  • {no extension}

It encrypts files found in the following folders:

  • %User Profile%\Documents
  • %User Profile%\Documents\Pictures
  • %Desktop%
  • %User Profile%\Music
  • %Desktop%
  • %User Startup%
  • %Start Menu%\Programs
  • %Application Data%
  • %Favorites%
  • %Program Files%

(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.. %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 Startup% is the current user's Startup folder, which is usually C:\Documents and Settings\{user}\Start Menu\Programs\Startup on Windows 2000 and XP, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows Vista, 7, and 8.. %Start Menu% is the Start Menu folder, where it usually is C:\Documents and Settings\{user name}\Start Menu on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu on 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.. %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming on 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.. %Favorites% is the Favorites folder, where it usually is C:\Documents and Settings\{user name}\Favorites on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\Favorites on 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.. %Program Files% is the Program Files folder, where it usually is C:\Program Files on all Windows operating system versions; C:\Program Files (x86) for 32-bit applications running on Windows 64-bit operating systems.)

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

  • .Saramat

It drops the following file(s) as ransom note:

  • %Desktop%\Decrypt.txt

(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.)

NOTES:

This ransomware contains codes that has the capability to:

  • Save image to %Application Data%\img.jpg and set it as desktop wallpaper.
  • Create autorun.inf files to auto-execute dropped copies.

    Its ransom note %Desktop%\Decrypt.txt contains:

    It also includes the following image in its resources:

    •   SOLUTION

    Minimum Scan Engine:

    9.850

    FIRST VSAPI PATTERN FILE:

    13.640.03

    FIRST VSAPI PATTERN DATE:

    05 Sep 2017

    VSAPI OPR PATTERN File:

    13.641.00

    VSAPI OPR PATTERN Date:

    06 Sep 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

    Search and delete these files

    [ Learn More ]
    There may be some files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.  
    • %Desktop%\Decrypt.txt

    Step 4

    Scan your computer with your Trend Micro product to delete files detected as RANSOM_HIDDENTEARSARAMAT.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 5

    Restore encrypted files from backup.


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