RANSOM_NOBLIS.A
Ransom.NOBlis (MalwareBytes)
Windows
Threat Type: Ransomware
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
Downloaded from the Internet, Dropped by other malware
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
7,391,650 bytes
EXE
No
14 Dec 2017
Encrypts files, Modifies system registry
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 Profile%\key.txt
- %Application Data%\encrypted_files.txt - contains a list of encrypted 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.. %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.)
It adds the following mutexes to ensure that only one of its copies runs at any one time:
- mutex_rr_windows
Other System Modifications
This Ransomware adds the following registry keys:
HKEY_CURRENT_USER\Software\Crypter
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Crypter
(Default) = {epoch time value}
Ransomware Routine
This Ransomware encrypts files with the following extensions:
- doc
- docx
- jpg
- mp3
- msi
- tar.gz
- tsx
- txt
- zip
It encrypts files found in the following folders:
- %User Profile% and its subfolders.
(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 appends the following extension to the file name of the encrypted files:
- .noblis
NOTES:
This ransomware displays the following message:
If the mutex already exists upon running the ransomware, it displays this message: Pressing the Enter Decryption Key displays the window: And pressing the View Encrypted Files Key displays a window containing a list of encrypted files:
SOLUTION
9.850
13.842.03
14 Dec 2017
13.843.00
15 Dec 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
Identify and terminate files detected as RANSOM_NOBLIS.A
- 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 4
Delete this registry key
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\Software
- Crypter
- Crypter
Step 5
Search and delete these files
- %User Profile%\key.txt
- %Application Data%\encrypted_files.txt
Step 6
Scan your computer with your Trend Micro product to delete files detected as RANSOM_NOBLIS.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 the following Trend Micro Support pages for more information:
Step 7
Restore encrypted files from backup.
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