RANSOM_BLACKMIST.A
Trojan.GenericKD.6035944 (BITDEFENDER); HEUR:Trojan.MSIL.Generic (KASPERSKY)
Windows
Threat Type: Ransomware
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
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 contains errors in its code. This stops it from performing its routines. It deletes itself after execution.
It encrypts files found in specific folders.
TECHNICAL DETAILS
1,709,056 bytes
EXE
Yes
28 Sep 2017
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 and executes the following files:
- %User Temp%\modual.exe <- component file for persistence
(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 modifies the following registry entry(ies) to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows NT\Current Version\Windows
Load = %User Temp%\modual.exe
Process Termination
This Ransomware terminates the following processes if found running in the affected system's memory:
- explorer
- taskmgr
- chrome
Other Details
This Ransomware contains errors in its code. This stops it from performing its routines.
It deletes itself after execution.
Ransomware Routine
This Ransomware encrypts files found in the following folders:
- C:\Users\Owner\Documents\
It appends the following extension to the file name of the encrypted files:
- blackmist
NOTES:
This ransomware displays the following:
SOLUTION
9.850
13.686.04
28 Sep 2017
13.687.00
29 Sep 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
Step 4
Delete this registry value
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\Microsoft\Windows NT\Current Version\Windows
- Load = %User Temp%\modual.exe
- Load = %User Temp%\modual.exe
Step 5
Search and delete these files
- %User Temp%\modual.exe
Step 6
Scan your computer with your Trend Micro product to delete files detected as RANSOM_BLACKMIST.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
Restart in normal mode and scan your computer with your Trend Micro product for files detected as RANSOM_BLACKMIST.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.
Did this description help? Tell us how we did.