Ransom.Win32.RYUK.FAILDEL
Ransom:Win32/Ryuk!MTB (Microsoft), Trojan-Ransom.Ryuk (Ikarus)
Windows
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 propagates via shared networks and drops copies of itself into available networks.
It drops files as ransom note. It avoids encrypting files with the following file extensions.
TECHNICAL DETAILS
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:
- {Malware Path}\{9 random characters}rep.exe
- {Malware Path}\{9 random characters}lan.exe - 2 copies with this name was dropped
It adds the following processes:
- {Malware Path}\{9 random characters}rep.exe 9 REP
- {Malware Path}\{9 random characters}lan.exe 8 LAN
- {Malware Path}\{9 random characters}lan.exe 8 LAN -> 2nd copy
- icacls ""{Drive letter}:\*"" /grant Everyone:F /T /C /Q
- net stop "{Service Name}"" /y
- taskkill /IM /F {Process Name}
- schtask /Create /S {remote machine} /TN {name of scheduled task} /TR "" /sc once /st 00:00 /RL HIGHEST
Propagation
This Ransomware propagates via shared networks and drops copies of itself into available networks.
Process Termination
This Ransomware terminates processes or services that contain any of the following strings if found running in the affected system's memory:
- Processes:
- virtual
- vmcomp
- vmwp
- veeam
- backup
- xchange
- sql
- dbeng
- sofos
- calc
- ekrn
- zoolz
- encsvc
- excel
- firefoxconfig
- infopath
- msaccess
- mspub
- mydesktop
- ocautoupds
- ocomm
- ocssd
- onenote
- oracle
- outlook
- powerpnt
- sqbcoreservice
- steam
- synctime
- tbirdconfig
- thebat
- thunderbird
- visio
- word
- xfssvccon
- tmlisten
- pccntmon
- cntaosmgr
- ntrtscan
- mbamtray
- Services:
- vmcomp
- vmwp
- Back
- xchange
- ackup
- acronis
- sql
- Enterprise
- Sophos
- Veeam
- AcrSch
- Antivirus
- bedbg
- DCAgent
- EPSecurity
- EPUpdate
- Eraser
- EsgShKernel
- FA_Scheduler
- IISAdmin
- IMAP4
- MBAM
- Endpoint
- Afee
- McShield
- task
- mfemms
- mfevtp
- mms
- MsDts
- Exchange
- ntrt
- PDVF
- POP3
- Report
- RESvc
- sacsvr
- SAVAdmin
- SamS
- SDRSVC
- SepMaster
- Monitor
- Smcinst
- SmcService
- SMTP
- SNAC
- swi
- CCSF
- TrueKey
- tmlisten
- UI0Detect
- W3S
- WRSVC
- NetMsmq
- ekrn
- EhttpSrv
- ESHASRV
- AVP
- klnagent
- wbengine
- KAVF
- mfefire
Ransomware Routine
This Ransomware avoids encrypting files with the following strings in their file name:
- ntldr
- bootmgr
- boot
- NTDETECT
It avoids encrypting files with the following strings in their file path:
- \Windows\
- Windows
- boot
- WINDOWS
- Chrome
- Mozilla
- SYSVOL
- NTDS
- netlogon
- sysvol
It appends the following extension to the file name of the encrypted files:
- .RYK
It drops the following file(s) as ransom note:
- %User Temp%\RyukReadMe.html
- {Encrypted Directory}\RyukReadMe.html
It avoids encrypting files with the following file extensions:
- .dll
- .exe
- .ini
- .lnk
SOLUTION
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.XXPE50FFF042
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
Identify and terminate files detected as Ransom.Win32.RYUK.FAILDEL
- Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
- If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
- If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.
Step 5
Search and delete this file
*Note: Read the following Microsoft page if these steps do not work on Windows 7 and Windows Server 2008 (R2).
Step 6
Scan your computer with your Trend Micro product to delete files detected as Ransom.Win32.RYUK.FAILDEL. 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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