Ransom.Win32.SEKHMET.C
N/A
Windows
Threat Type: Ransomware
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
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.
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
376,832 bytes
Other
Yes
29 Jun 2020
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
- %User Temp%\VS Update\kb948593581.dll
(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.. %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)
It adds the following processes:
- "%System%\MsiExec.exe" /Y "%User Temp%\VS Update\kb948593581.dll"
(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)
It creates the following folders:
- %User Temp%\VS Update
(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)
It adds the following mutexes to ensure that only one of its copies runs at any one time:
- Global\{16 Random Characters}
Process Termination
This Ransomware terminates the following processes if found running in the affected system's memory:
- agntsvc.exe
- dbeng50.exe
- dbsnmp.exe
- dumpcap.exe
- encsvc.exe
- excel.exe
- firefoxconfig.exe
- infopath.exe
- ipython.exe
- isqlplussvc.exe
- msaccess.exe
- msftesql.exe
- mspub.exe
- mydesktopqos.exe
- mydesktopservice.exe
- mysqld-nt.exe
- mysqld-opt.exe
- mysqld.exe
- ocautoupds.exe
- ocomm.exe
- ocssd.exe
- onenote.exe
- oracle.exe
- outlook.exe
- powerpnt.exe
- procexp.exe
- procexp64.exe
- procmon.exe
- procmon64.exe
- python.exe
- QBW32.exe
- QBW64.exe
- sqbcoreservice.exe
- sqlagent.exe
- sqlbrowser.exe
- sqlservr.exe
- sqlwriter.exe
- steam.exe
- synctime.exe
- tbirdconfig.exe
- thebat.exe
- thebat64.exe
- thunderbird.exe
- visio.exe
- winword.exe
- wordpad.exe
- wpython.exe
- xfssvccon.exe
Information Theft
This Ransomware gathers the following data:
- User Name
- Computer Name
- Workgroup
- Domain Name
- AV Information
- Drive Information
- GUID
- Product Name
- Display Name
- Systems Architecture
- Operating System
- Processor Information
Stolen Information
This Ransomware sends the gathered information via HTTP POST to the following URL:
- {BLOCKED}.{BLOCKED}.126.81/update.php?id={Random Numbers}
- {BLOCKED}.{BLOCKED}.126.82/update.php?id={Random Numbers}
- {BLOCKED}.{BLOCKED}.126.83/update.php?id={Random Numbers}
- {BLOCKED}.{BLOCKED}.126.84/update.php?id={Random Numbers}
- {BLOCKED}.{BLOCKED}.126.85/update.php?id={Random Numbers}
- {BLOCKED}.{BLOCKED}.126.86/update.php?id={Random Numbers}
- {BLOCKED}.{BLOCKED}.126.87/update.php?id={Random Numbers}
- {BLOCKED}.{BLOCKED}.126.88/update.php?id={Random Numbers}
- {BLOCKED}.{BLOCKED}.126.89/update.php?id={Random Numbers}
Other Details
This Ransomware does the following:
- It checks for the computer's language and terminates itself if any the following language is detected:
- Armenian
- Azerbaijani
- Belarusian
- Georgian
- Kazakh
- Kyrgyz
- Romanian
- Russian
- Tajik
- Tatar
- Turkmen
- Ukrainian
- Uzbek
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
- RECOVER-FILES.txt
It avoids encrypting files with the following strings in their file path:
- \Windows
- \Program Files
- \Tor Browser
- \ProgramData\
- \cache2\entries\
- \Low\Content.IE5\
- \User Data\Default\Cache\
- \All Users
It renames encrypted files using the following names:
- {Original Filename}.{Original File Extension}.{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:
- .lnk
- .exe
- .sys
- .dll
SOLUTION
9.850
15.970.01
01 Jul 2020
15.971.00
02 Jul 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
Search and delete these files
- %ProgramData%\syscfg.db
- %User Temp%\VS Update\kb948593581.dll
- {Encrypted Directory}\RECOVER-FILES.txt
Step 4
Search and delete these folders
- %User Temp%\VS Update
Step 5
Scan your computer with your Trend Micro product to delete files detected as Ransom.Win32.SEKHMET.C. 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
Restore encrypted files from backup.
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