Ransom.Win32.DMR.A
Trojan-Ransom.Win32.Gen.ucd (Kaspersky); Trojan-Ransom.FileCrypter (Ikarus)
Windows
Threat Type: Ransomware
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
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 drops files as ransom note. It avoids encrypting files with the following file extensions.
TECHNICAL DETAILS
196,096 bytes
EXE
No
18 Dec 2019
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 adds the following processes:
- mshta.exe %System Root%\!!! READ THIS !!!.hta
(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)
Process Termination
This Ransomware terminates the following processes if found running in the affected system's memory:
- mshta.exe (on this malware's initial execution)
Other Details
This Ransomware displays the following images:
It does the following:
- It encrypts files found in drives A to Z
Ransomware Routine
This Ransomware avoids encrypting files found in the following folders:
- Windows
- ProgramData
- Boot
- AppData
- All Users
It renames encrypted files using the following names:
- [id={hex characters}]{original file name and extension}.DMR64
It drops the following file(s) as ransom note:
- {Directory it traversed while encrypting files}\!!! READ THIS !!!.hta
It avoids encrypting files with the following file extensions:
- .sys
SOLUTION
9.850
15.576.05
23 Dec 2019
15.577.00
24 Dec 2019
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.XXPE50FFF033
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.DMR.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 5
Search and delete these files
- {Directory it traversed while encrypting files}\!!! READ THIS !!!.hta
Step 6
Scan your computer with your Trend Micro product to delete files detected as Ransom.Win32.DMR.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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