Analysis by: Carlos Villegas Madrid
ALIASES:

Generic.Ransom.Lilith.A.91D82EED (BITDEFENDER)

 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 avoids encrypting files with the following file extensions.

  TECHNICAL DETAILS

File Size: 360,448 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 21 Aug 2023
Payload: Disables AV, Encrypts files, Terminates processes

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.

Process Termination

This Ransomware terminates the following services if found on the affected system:

  • SophosUI.exe
  • SEDService.exe
  • SophosHealth.exe
  • SophosFS.exe
  • SSPService.exe
  • SophosFileScanner.exe
  • McsAgent.exe
  • McsClient.exe
  • SophosLiveQueryService.exe
  • SophosNetFilter.exe
  • SophosNtpService.exe
  • hmpalert.exe
  • Sophos.Encryption.BitLockerService.exe
  • SophosOsquery.exe
  • ccSvcHst.exe
  • SymCorpUI.exe
  • SISIPSService.exe
  • SISIDSService.exe
  • SmcGui.exe
  • sisipsutil.exe
  • sepWscSvc64.exe
  • MsMpEng.exe
  • CSFalconService.exe
  • cydump.exe
  • cyreport.exe
  • cyrestart.exe
  • cyrprtui.exe
  • cyserver.exe
  • cytool.exe
  • cytray.exe
  • cyuserserver.exe
  • CyveraConsole.exe
  • tlaworker.exe

It terminates the following processes if found running in the affected system's memory:

  • sql.exe
  • oracle.exe
  • ocssd.exe
  • dbsnmp.exe
  • synctime.exe
  • agntsvc.exe
  • isqlplussvc.exe
  • xfssvccon.exe
  • mydesktopservice.exe
  • ocautoupds.exe
  • encsvc.exe
  • firefox.exe
  • tbirdconfig.exe
  • mydesktopqos.exe
  • ocomm.exe
  • dbeng50.exe
  • sqbcoreservice.exe
  • excel.exe
  • infopath.exe
  • msaccess.exe
  • mspub.exe
  • onenote.exe
  • outlook.exe
  • powerpnt.exe
  • steam.exe
  • thebat.exe
  • thunderbird.exe
  • visio.exe
  • winword.exe
  • wordpad.exe
  • notepad.exe

Other Details

This Ransomware does the following:

  • It encrypts files in all available drives and shared folders
  • It displays the following text on the console after execution

Ransomware Routine

This Ransomware avoids encrypting files with the following strings in their file path:

  • Windows
  • Windows.old
  • Tor Browser
  • Internet Explorer
  • Google
  • Opera
  • Opera Software
  • Mozilla
  • Mozilla Firefox
  • $Recycle.Bin
  • ProgramData
  • All Users
  • autorun.inf
  • boot.ini
  • bootfont.bin
  • bootsect.bak
  • bootmgr
  • bootmgr.efi
  • bootmgfw.efi
  • desktop.ini
  • iconcache.db
  • ntldr
  • ntuser.dat
  • ntuser.dat.log
  • ntuser.ini
  • thumbs.db
  • ecdh_pub_k.bin
  • Program Files
  • Program Files (x86)

It appends the following extension to the file name of the encrypted files:

  • .locked

It leaves text files that serve as ransom notes containing the following text:

  • {Encrypted Directory}\Restore_Your_Files.txt

It avoids encrypting files with the following file extensions:

  • .exe
  • .dll
  • .sys

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 18.648.04
FIRST VSAPI PATTERN DATE: 21 Aug 2023
VSAPI OPR PATTERN File: 18.649.00
VSAPI OPR PATTERN Date: 22 Aug 2023

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:

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

[ Learn More ]

Step 5

Search and delete these files

[ 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 Directory}\Restore_Your_Files.txt

Step 6

Restart in normal mode and scan your computer with your Trend Micro product for files detected as Ransom.Win64.LILITH.YADHUT. 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 7

Restore encrypted files from backup.


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