Ransom.Win32.SEKHMET.A


 ALIASES:

W32/Cryptor.DDU!tr (FORTINET); Trj/GdSda.A (PANDA)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Ransomware

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

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 connects to certain websites to send and receive information. However, as of this writing, the said sites are inaccessible.

It drops files as ransom note. It avoids encrypting files with the following file extensions.

  TECHNICAL DETAILS

File Size:

709,632 bytes

File Type:

DLL

Memory Resident:

No

Initial Samples Received Date:

23 Mar 2020

Payload:

Connects to URLs/IPs, Terminates processes, Encrypts files, Displays message/message boxes

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:

  • %ProgramData%\syscfg.db
  • {Encrypted Directory}\{8 random characters}.lnk -> deleted afterwards

(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 mutexes to ensure that only one of its copies runs at any one time:

  • Global\{16 characters}

Process Termination

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

  • msftesql.exe
  • sqlagent.exe
  • sqlbrowser.exe
  • sqlwriter.exe
  • oracle.exe
  • ocssd.exe
  • dbsnmp.exe
  • synctime.exe
  • agntsvc.exe
  • isqlplussvc.exe
  • xfssvccon.exe
  • sqlservr.exe
  • mydesktopservice.exe
  • ocautoupds.exe
  • encsvc.exe
  • firefoxconfig.exe
  • tbirdconfig.exe
  • mydesktopqos.exe
  • ocomm.exe
  • mysqld.exe
  • mysqld-nt.exe
  • mysqld-opt.exe
  • dbeng50.exe
  • sqbcoreservice.exe
  • excel.exe
  • infopath.exe
  • msaccess.exe
  • mspub.exe
  • onenote.exe
  • outlook.exe
  • powerpnt.exe
  • sqlservr.exe
  • thebat.exe
  • steam.exe
  • thebat64.exe
  • thunderbird.exe
  • visio.exe
  • winword.exe
  • wordpad.exe
  • QBW32.exe
  • QBW64.exe
  • ipython.exe
  • wpython.exe
  • python.exe
  • dumpcap.exe
  • procmon.exe
  • procmon64.exe
  • procexp.exe
  • procexp64.exe

Other Details

This Ransomware connects to the following website to send and receive information:

  • {BLOCKED}.{BLOCKED}.126.81
  • {BLOCKED}.{BLOCKED}.126.82
  • {BLOCKED}.{BLOCKED}.126.83
  • {BLOCKED}.{BLOCKED}.126.84
  • {BLOCKED}.{BLOCKED}.126.85
  • {BLOCKED}.{BLOCKED}.126.86
  • {BLOCKED}.{BLOCKED}.126.87
  • {BLOCKED}.{BLOCKED}.126.88
  • {BLOCKED}.{BLOCKED}.126.89

It does the following:

  • It gathers the following information:
    • Product Name
    • Display Name
    • Drive Info
    • AV Info
    • Computer Name
    • User Name
    • Machine GUID
  • It encrypts all available drives including network drives.
  • It gathers the following Environment Variable values:
    • ALLUSERSPROFILE
    • APPDATA
    • CommonProgramFiles
    • COMPUTERNAME
    • Comspec
    • FP_NO_HOST_CHECK
    • HOMEDRIVE
    • HOMEPATH
    • LOCALAPPDATA
    • LOGONSERVER
    • NUMBER_OF_PROCESSORS
    • OS
    • Path
    • PROCESSOR_ARCHITECTURE
    • PROCESSOR_IDENTIFIER
    • PROCESSOR_LEVEL
    • PROCESSOR_REVISION
    • ProgramData
    • ProgramFiles
    • PSModulePath
    • PUBLIC
    • SESSIONNAME
    • SystemDrive
    • SystemRoot
    • TEMP
    • TMP
    • USERDOMAIN
    • USERNAME
    • USERPROFILE
    • windir
    • windows_tracing_flags
    • windows_tracing_logfile

However, as of this writing, the said sites are inaccessible.

Ransomware Routine

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

  • autorun.inf
  • boot.ini
  • desktop.ini
  • ntuser.dat
  • iconcache.db
  • bootsect.bak
  • ntuser.dat.log
  • thumbs.db
  • Bootfont.bin

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

  • \Windows
  • \Program Files
  • \Program Data
  • \Tor Browser
  • \cache2\entries
  • \Low\Content IE5\
  • \User Data\Default\Cache
  • \All Users

It renames encrypted files using the following names:

  • {Encrypted Directory}\{Encrypted file}.{Random characters}

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

  • {Encrypted Directory}\RECOVER-FILES.txt

It avoids encrypting files with the following file extensions:

  • sys
  • exe
  • dll
  • lnk

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

15.760.08

FIRST VSAPI PATTERN DATE:

23 Mar 2020

VSAPI OPR PATTERN File:

15.761.00

VSAPI OPR PATTERN Date:

24 Mar 2020

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

Restart in Safe Mode

[ Learn More ]

Step 4

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.  
  • %ProgramData%\syscfg.db

Step 5

Restart in normal mode and scan your computer with your Trend Micro product for files detected as Ransom.Win32.SEKHMET.A. 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 6

Restore encrypted files from backup.

Step 7

Scan your computer with your Trend Micro product to delete files detected as Ransom.Win32.SEKHMET.A. 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:


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