Ransom.Win32.MAKOP.GAIN
N/A
Windows
Threat Type: Ransomware
Destructiveness: No
Encrypted: No
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 drops files as ransom note. It avoids encrypting files with the following file extensions.
TECHNICAL DETAILS
287,985 bytes
EXE
No
19 Feb 2021
Encrypts files, Displays message/message boxes, Deletes 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 folders:
- %User Temp%\{Random Characters}.tmp
- %Programs%\JRE Test
(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).. %Programs% is the folder that contains the user’s program groups, which is usually C:\Windows\Start Menu\Programs or C:\Documents and Settings\{User name}\Start Menu\Programs on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu\Programs on Windows Vista, 7, and 8.)
It drops the following files:
- %Programs%\JRE Test\Uninstall.lnk → points to %Application Data%\uninstall.exe
- %Programs%\JRE Test\JRE Test.lnk → points to %Application Data%\jretext.exe
- %Application Data%\402991629
- %User Temp%\{Random Characters}.tmp\System.dll
(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(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %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:
- {Malware Path}\{Malware Filename}.exe
- vssadmin delete shadows /all /quiet → deletes shadow copies
- wbadmin delete catalog -quiet → deletes backup catalog
- wmic shadowcopy delete → deletes shadow copies
It adds the following mutexes to ensure that only one of its copies runs at any one time:
- m23071644
It injects codes into the following process(es):
- created {Malware Path}\{Malware Filename}.exe process
Other System Modifications
This Ransomware deletes the following files:
- %User Temp%\{Random Characters}.tmp
(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).)
Process Termination
This Ransomware terminates the following processes if found running in the affected system's memory:
- agntsrvc.exe
- dbeng50.exe
- dbsnmp.exe
- encsvc.exe
- excel.exe
- firefoxconfig.exe
- infopath.exe
- isqlplussvc.exe
- msaccess.exe
- msftesql.exe
- mspub.exe
- mydesktopqos.exe
- mydesktopservice.exe
- mysqld-nt.exe
- mysqld-opt.exe
- mysqld.exe
- ocautoupds.exe
- ocomm.exe
- ocssd.exe
- onenote.exe
- oracle.exe
- outlook.exe
- powerpnt.exe
- sqbcoreservice.exe
- sqlagent.exe
- sqlbrowser.exe
- sqlservr.exe
- sqlwriter.exe
- steam.exe
- synctime.exe
- tbirdconfig.exe
- thebat.exe
- thebat64.exe
- thunderbird.exe
- visio.exe
- winword.exe
- wordpad.exe
- xfssvccon.exe
Ransomware Routine
This Ransomware avoids encrypting files with the following strings in their file name:
- boot.ini
- bootfont.bin
- ntldr
- ntdetect.com
- io.sys
- readme-warning.txt
- desktop.ini
It avoids encrypting files found in the following folders:
- RECYCLER
- chrome
- mozilla firefox
- internet explorer
- windows
- winnt
- C:\Windows
- C:\ProgramData\microsoft\windows\caches
- C:\Users\All Users\Microsoft\Windows\Caches
- C:\ProgramData
- C:\Users
It renames encrypted files using the following names:
- {Original Filename}.{Original File Extension}.[{8 Random Characters}].[{BLOCKED}o0213@airmail.cc].vassago
It drops the following file(s) as ransom note:
- {Encrypted Directory}\readme-warning.txt
It leaves text files that serve as ransom notes containing the following text:
It avoids encrypting files with the following file extensions:
- .makop
- .CARLOS
- .shootlock
- .shootlock2
- .1recoesufV8Sv6g
- .1recocr8M4YJskJ7
- .btc
- .KJHslgjkjdfg
- .origami
- .tomas
- .RAGA
- .zbw
- .fireee
- .XXX
- .element
- .HELP
- .zes
- .lockbit
- .captcha
- .gunga
- .fair
- .SOS
- .Boss
- .moloch
- .vassago
- .exe
- .dll
SOLUTION
9.800
16.548.03
19 Feb 2021
16.549.00
20 Feb 2021
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.XXPE50FSX007
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
Search and delete these files
- %Programs%\JRE Test\Uninstall.lnk
- %Programs%\JRE Test\JRE Test.lnk
- %Application Data%\402991629
- %User Temp%\{Random Characters}.tmp\System.dll
- {Encrypted Directory}\readme-warning.txt
Step 5
Search and delete these folders
- %User Temp%\{Random Characters}.tmp
- %Programs%\JRE Test
Step 6
Scan your computer with your Trend Micro product to delete files detected as Ransom.Win32.MAKOP.GAIN. 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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