Ransom.Win64.AZVO.THJCABB
Win64:Malware-gen(AVAST)
Windows
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Ransomware
Destructiveness: No
Encrypted:
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
33,280 bytes
EXE
No
Drops 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 mutexes to ensure that only one of its copies runs at any one time:
- Local\azov
- Local\Kasimir_C
Other System Modifications
This Ransomware modifies the following file(s):
- %ProgramData%\rdpclient.exe → injects malicious codes.
(Note: %ProgramData% is a version of the Program Files folder where any user on a multi-user computer can make changes to programs. This contains application data for all users. This is usually C:\ProgramData on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit), or C:\Documents and Settings\All Users on Windows Server 2003(32-bit), 2000(32-bit) and XP.)
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
Bandera = %ProgramData%\rdpclient.exe
Other Details
This Ransomware adds the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run\
Bandera
It does the following:
- Checks if msiexec.exe or perfmon.exe is present in the machine:
- if msiexec.exe or perfmon.exe is present checks if rdpclient.exe is present in the machine:
- if rdpclient.exe is present, modifies rdpclient.exe(injects malicious codes).
- if msiexec.exe or perfmon.exe is present checks if rdpclient.exe is present in the machine:
- Encrypts Fixed, Removable and Network Shares.
- Encrypts if date and time is:
- October 27, 2022 - 10:14:30 AM
- Uses Intermittent Encryption - encrypts 666 bytes then skips 666 bytes
Ransomware Routine
This Ransomware avoids encrypting files found in the following folders:
- Windows
- Program Data
- cache2\entries
- Low\Content.IE5
- User Data\Default\Cache
- Documents and Settings
- All Users
It appends the following extension to the file name of the encrypted files:
- .azov
It drops the following file(s) as ransom note:
- {Encrypted Directory}\RESTORE_FILES.txt
It avoids encrypting files with the following file extensions:
- .dll
- .exe
- .ini
- .azov
SOLUTION
9.800
17.908.04
29 Oct 2022
17.909.00
30 Oct 2022
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.XXPE50FFF062
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
Restart in Safe Mode
Step 5
Search and delete these files
Step 6
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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- Bandera = %ProgramData%\rdpclient.exe
- Bandera = %ProgramData%\rdpclient.exe
Step 7
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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- Bandera
- Bandera
Step 8
Restart in normal mode and scan your computer with your Trend Micro product for files detected as Ransom.Win64.AZVO.THJCABB. 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 9
Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.
- %ProgramData%\rdpclient.exe
Step 10
Restore encrypted files from backup.
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