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RANSOM_NODEAD.A

August 14, 2017
 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Ransomware

  • Destructiveness: No

  • Encrypted: Yes

  • 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 drops files as ransom note.

  TECHNICAL DETAILS

File Size:

454,656 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

21 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 drops the following copies of itself into the affected system:

  • %User Temp%\3aNvQ15615Dr71Q.exe

(Note: %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.)

Autostart Technique

This Ransomware adds the following registry entries to enable its automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
Alcmeter = %User Temp%\3aNvQ15615Dr71Q.exe

Other System Modifications

This Ransomware adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
JJRBGFUBSLTGSUP

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
.Node0

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
JJRBGFUBSLTGSUP

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
JJRBGFUBSLTGSUP\DefaultIcon

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
JJRBGFUBSLTGSUP\shell\open\
command

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
.Node0

Ransomware Routine

This Ransomware encrypts files with the following extensions:

  • .zip
  • .rar
  • .7z
  • .tar
  • .gzip
  • .jpg
  • .jpeg
  • .psd
  • .cdr
  • .dwg
  • .max
  • .bmp
  • .gif
  • .png
  • .doc
  • .docx
  • .xls
  • .xlsx
  • .ppt
  • .pptx
  • .txt
  • .pdf
  • .djvu
  • .htm
  • .html
  • .mdb
  • .cer
  • .p12
  • .pfx
  • .kwm
  • .pwm
  • .1cd
  • .md
  • .mdf
  • .dbf
  • .odt
  • .vob
  • .ifo
  • .lnk
  • .torrent
  • .mov
  • .m2v
  • .3gp
  • .mpeg
  • .mpg
  • .flv
  • .avi
  • .mp4
  • .wmv
  • .divx
  • .mkv
  • .mp3
  • .wav
  • .flac
  • .ape
  • .wma
  • .ac3

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

  • .Node0

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

  • {Encrypted files directory}\HOW TO DECRYPT FILES.txt

It leaves text files that serve as ransom notes containing the following text:

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

13.570.08

FIRST VSAPI PATTERN DATE:

02 Aug 2017

VSAPI OPR PATTERN File:

13.571.00

VSAPI OPR PATTERN Date:

03 Aug 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 key

[ 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.

 
  • HKEY_LOCAL_MACHINE\SOFTWARE\Classes\.Node0
  • HKEY_LOCAL_MACHINE\SOFTWARE\Classes\JJRBGFUBSLTGSUP

Step 5

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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    • Alcmeter = %User Temp%\3aNvQ15615Dr71Q.exe

Step 6

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.
  • {Encrypted files directory}\HOW TO DECRYPT FILES.txt
  • %User Temp%\3aNvQ15615Dr71Q.exe

Step 7

Restart in normal mode and scan your computer with your Trend Micro product for files detected as RANSOM_NODEAD.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 8

Restore encrypted files from backup.


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