Ransom.Win32.NOSTRO.AA
Trojan:Win32/Dynamer!ac (Microsoft)
Windows
Threat Type: Ransomware
Destructiveness: No
Encrypted:
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.
TECHNICAL DETAILS
328,704 bytes
No
25 Dec 2018
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:
- %Application Data%\_uninstalling_.png
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, and 8.)
Ransomware Routine
This Ransomware appends the following extension to the file name of the encrypted files:
- .NOSTRO
It drops the following file(s) as ransom note:
- {Encrypted Directory}:\#RECOVERY_FILES#.txt
SOLUTION
9.850
14.711.00
25 Dec 2018
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 this file
- %Application Data%\_uninstalling_.png
- {Encrypted Directory}:/#RECOVERY_FILES#.txt
Step 4
Scan your computer with your Trend Micro product to delete files detected as Ransom.Win32.NOSTRO.AA. 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 5
Restore encrypted files from backup.
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