Ransom.Win32.NEFILIM.G
Trojan-Ransom.Nemty (IKARUS); W32/GenericRXKC.OA!tr (FORTINET)
Windows
Threat Type: Ransomware
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
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 drops files as ransom note. It avoids encrypting files with the following file extensions.
TECHNICAL DETAILS
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:
- %User Temp%\scam.jpg
(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)
It adds the following processes:
- "%System%\cmd.exe" /c WmIc ShaDowcoPY delEte - delete shadow copies
(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)
It adds the following mutexes to ensure that only one of its copies runs at any one time:
- ONA MOYA ROZA I YA EE LUBLUUUUUUUU, ONA MOYA DOZA - SEGODNYA ZATYANU
Other System Modifications
This Ransomware changes the desktop wallpaper by modifying the following registry entries:
HKEY_CURRENT_MACHINE\Control Panel\Desktop
Wallpaper = %User Temp%\scam.jpg
It sets the system's desktop wallpaper to the following image:
Other Details
This Ransomware does the following:
- It encrypts files in fixed, removable, and network drives
- It can accept arguments to specify which file or folder to encrypt
Ransomware Routine
This Ransomware avoids encrypting files with the following strings in their file path:
- $recycle.bin
- rsa
- ntuser.dat
- programdata
- appdata
- program files
- program files (x86)
- windows
It appends the following extension to the file name of the encrypted files:
- .OFFWHITE
It drops the following file(s) as ransom note:
- {Drive Letter}:\OFFWHITE-MANUAL.txt
It avoids encrypting files with the following file extensions:
- .exe
- .log
- .cab
- .cmd
- .com
- .cpl
- .ini
- .dll
- .url
- .ttf
- .mp3
- .pif
- .mp4
- .OFFWHITE
- .msi
SOLUTION
Step 1
Trend Micro Predictive Machine Learning detects and blocks malware at the first sign of its existence, before it executes on your system. When enabled, your Trend Micro product detects this malware under the following machine learning name:
-
Troj.Win32.TRX.XXPE50FFF035
Step 2
Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 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
Identify and terminate files detected as Ransom.Win32.NEFILIM.G
- Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
- If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
- If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.
Step 5
Search and delete these files
- %User Temp%\scam.jpg
- {Drive Letter}:\OFFWHITE-MANUAL.txt
Step 6
Reset your Desktop properties
Step 7
Scan your computer with your Trend Micro product to delete files detected as Ransom.Win32.NEFILIM.G. 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 the following Trend Micro Support pages for more information:
Step 8
Restore encrypted files from backup.
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