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RANSOM_REETNER.A

September 26, 2017
 Analysis by: Johnlery Triunfante
 ALIASES:

Riskware/Filecoder (FORTINET); Trojan.GenericKD.5475785 (BITDEFENDER)

 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.

  TECHNICAL DETAILS

File Size:

6,922,240 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

23 Jun 2017

Payload:

Drops files, Displays graphics/image, 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.

Installation

This Ransomware drops the following files:

  • %System Root%\Users\{subfolders}\Unlock_My_Files.html - Ransom note
  • %System Root%\Documents and Settings\{subfolders}\Unlock_My_Files.html - Ransom note
  • %User Temp%\wallpaper.bmp - Used as desktop background

(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.. %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp 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.)

Other System Modifications

This Ransomware changes the desktop wallpaper by modifying the following registry entries:

HKCU\Control Panel\Desktop
TileWallpaper = 0 or 1

HKCU\Control Panel\Desktop
WallpaperStyle = 1 or 2

HKCU\Control Panel\Desktop
Wallpaper = %User Temp%\wallpaper.bmp

It sets the system's desktop wallpaper to the following image:

Other Details

This Ransomware does the following:

  • This ransomware does not encrypt files.

NOTES:

This ransomware drops the following html file as its ransom note:

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

13.488.06

FIRST VSAPI PATTERN DATE:

23 Jun 2017

VSAPI OPR PATTERN File:

13.489.00

VSAPI OPR PATTERN Date:

24 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

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 Safe Mode

[ Learn More ]

Step 4

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

 
  • In HKEY_CURRENT_USER\Control Panel\Desktop
    • TileWallpaper = 0 or 1
  • In HKEY_CURRENT_USER\Control Panel\Desktop
    • WallpaperStyle = 1 or 2
  • In HKEY_CURRENT_USER\Control Panel\Desktop
    • Wallpaper = %User Temp%\wallpaper.bmp

Step 5

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.
  • %System Root%\Users\{subfolders}\Unlock_My_Files.html
  • %System Root%\Documents and Settings\{subfolders}\Unlock_My_Files.html
  • %User Temp%\wallpaper.bmp

Step 6

Restart in normal mode and scan your computer with your Trend Micro product for files detected as RANSOM_REETNER.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 7

Reset your Desktop properties

[ Learn More ]


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