Ransom.Win32.PHOBOS.JSHSMT

March 27, 2020
 Analysis by: Patrick Noel Collado
 ALIASES:

Ransom:Win32/Phobos.V!MTB (Microsoft), HEUR:Trojan.Win32.Generic (Kaspersky)

 PLATFORM:

Windows

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

  • Threat Type: Ransomware

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware

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

  TECHNICAL DETAILS

File Size:

56,832 bytes

Memory Resident:

Yes

Initial Samples Received Date:

27 Mar 2020

Payload:

Drops 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.

Installation

This Ransomware drops the following copies of itself into the affected system:

  • %AppDataLocal%\{Malware Name}.exe

(Note: %AppDataLocal% is the Local Application Data folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

It adds the following processes:

  • vssadmin delete shadows /all /quiet
  • netsh advfirewall set currentprofile state off
  • netsh firewall set opmode mode=disable
  • wmic shadowcopy delete
  • bcdedit /set {default} bootstatuspolicy ignoreallfailures
  • bcdedit /set {default} recoveryenabled no
  • wbadmin delete catalog -quiet
  • "%System%\mshta.exe" "%Desktop%\info.hta"
  • "%System%\mshta.exe" "%Public%\Desktop\info.hta"
  • "%System%\mshta.exe" "{Drive Letter}\info.hta"

(Note: %Desktop% is the current user's desktop, which is usually C:\Documents and Settings\{User Name}\Desktop on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\Desktop on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %Public% is the folder that serves as a repository of files or folders common to all users, which is usually C:\Users\Public in Windows Vista, 7, and 8.)

It adds the following mutexes to ensure that only one of its copies runs at any one time:

  • Global\<>{Volume Serial Number}00000001
  • Global\<>{Volume Serial Number}00000000

Autostart Technique

This Ransomware modifies the following registry entry(ies) to enable its automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
{Malware Name} = %AppDataLocal%\{Malware Name}.exe

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{Malware Name} = %AppDataLocal%\{Malware Name}.exe

It drops the following file(s) in the Windows User Startup folder to enable its automatic execution at every system startup:

  • %User Startup%\{Malware Name}.exe

(Note: %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows 2003(32-bit), XP and 2000(32-bit), or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit), 10(64-bit).)

It drops the following file(s) in the Windows Common Startup folder to enable its automatic execution at every system startup:

  • %Common Startup%\{Malware Name}.exe

(Note: %Common Startup% is the startup folder for all users, which is usually C:\Documents and Settings\All Users\Start Menu\Programs\Startup on Windows 2000, XP, and Server 2003, or C:\ProgramData\Microsoft\Windows\Start Menu\Programs\Startup on Windows Vista, 7, and 8.)

Process Termination

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

  • agntsvc.exe
  • dbeng50.exe
  • dbsnmp.exe
  • encsvc.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
  • ocautoupds.exe
  • ocomm.exe
  • ocssd.exe
  • onenote.exe
  • oracle.exe
  • outlook.exe
  • powerpnt.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
  • xfssvccon.exe

Ransomware Routine

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

  • info.hta
  • info.txt
  • boot.ini
  • bootfont.bin
  • ntldr
  • ntdetect.com
  • {Malware Name}.exe

It avoids encrypting files found in the following folders:

  • %ProgramData%\microsoft\windows\caches
  • %Windows%

(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.. %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)

It renames encrypted files using the following names:

  • {Filename}.{file extension}.id[{Volume Serial Number}-2681].[{BLOCKED}kup@cock.li].Devos

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

  • %Desktop%\info.hta
  • %Public%\Desktop\info.hta
  • {Drive Letter}\info.hta

  • %Desktop%\info.txt
  • %Public%\Desktop\info.txt
  • {Drive Letter}\info.txt

It avoids encrypting files with the following file extensions:

  • fdb
  • sql
  • 4dd
  • 4dl
  • abs
  • abx
  • accdb
  • accdc
  • accde
  • adb
  • adf
  • ckp
  • db
  • db-journal
  • db-shm
  • db-wal
  • db2
  • db3
  • dbc
  • dbf
  • dbs
  • dbt
  • dbv
  • dcb
  • dp1
  • eco
  • edb
  • epim
  • fcd
  • gdb
  • mdb
  • mdf
  • ldf
  • myd
  • ndf
  • nwdb
  • nyf
  • sqlitedb
  • sqlite3
  • sqlite
  • Devos
  • actin
  • Acton
  • actor
  • Acuff
  • Acuna
  • acute
  • adage
  • Adair
  • Adame
  • banhu
  • banjo
  • Banks
  • Banta
  • Barak
  • Caleb
  • Cales
  • Caley
  • calix
  • Calvo
  • deuce
  • Dever
  • devil
  • Devoe
  • Devon
  • Devos
  • dewar
  • eight
  • eject
  • eking
  • Elbie
  • elbow
  • elder
  • phobos
  • help
  • blend
  • bqux
  • com
  • mamba
  • KARLOS
  • DDoS
  • phoenix
  • PLUT
  • karma
  • bbc
  • CAPITAL
  • WALLET

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

15.768.04

FIRST VSAPI PATTERN DATE:

27 Mar 2020

VSAPI OPR PATTERN File:

15.769.00

VSAPI OPR PATTERN Date:

28 Mar 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.XXPE50FFF034

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.PHOBOS.JSHSMT

[ Learn More ]
  1. 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.
  2. 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.
  3. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

Step 5

Delete this registry value

[ Learn More ]

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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    • {Malware Name} = %AppDataLocal%\{Malware Name}.exe
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • {Malware Name} = %AppDataLocal%\{Malware Name}.exe

Step 6

Search and delete this file

[ 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.
  • %AppDataLocal%\{Malware Name}.exe
  • %User Startup%\{Malware Name}.exe
  • %Common Startup%\{Malware Name}.exe
  • %Desktop%\info.hta
  • %Public%\Desktop\info.hta
  • {Drive Letter}\info.hta
  • %Desktop%\info.txt
  • %Public%\Desktop\info.txt
  • {Drive Letter}\info.txt

Step 7

Scan your computer with your Trend Micro product to delete files detected as Ransom.Win32.PHOBOS.JSHSMT. 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 8

Restore encrypted files from backup.


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