Overview

overview

10

Static

static

10

Yashma ran....2.exe

windows10-ltsc_2021-x64

10

Analysis

  • user interaction
    yes
  • max time kernel
    86s
  • max time network
    89s
  • platform
    windows10-ltsc_2021_x64
  • resource
    win10ltsc2021-20260911-en
  • resource tags

    arch:x64arch:x86image:win10ltsc2021-20260911-enlocale:en-usos:windows10-ltsc_2021-x64systemwindows
  • submitted
    19/09/2026, 13:46

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General

  • Target
    Yashma ransomware builder v1.2.exe
  • Size 538KB
  • Sample260919-q3bltav13p
  • SHA256 f9a5a72ead096594c5d59abe706e3716f6000c3b4ebd7690f2eb114a37d1a7db
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
10/10
defense_evasionevasionexecutionchaosimpactpersistenceprivilege_escalationransomwarespywarestealer

Malware Config

Extracted

Path

  • C:\ProgramData\Adobe\Setup\{AC76BA86-7AD7-1033-7B44-AC0F074E4100}\read_it.txt

Ransom Note
  • Don't worry, you can return all your files! All your files like documents, photos, databases and other important are encrypted What guarantees do we give to you? You can send 3 of your encrypted files and we decrypt it for free. You must follow these steps To decrypt your files : 1) Write on our e-mail :[email protected] ( In case of no answer in 24 hours check your spam folder or write us to this e-mail: [email protected]) 2) Obtain Bitcoin (You have to pay for decryption in Bitcoins. After payment we will send you the tool that will decrypt all your files.)

Signatures

  • Family: Chaos

    Ransomware family first seen in June 2021.

    ransomwarechaos
  • Chaos Ransomware 4 IoCs
  • Deletes shadow copies 3 TTPs

    Ransomware often targets backup files to inhibit system recovery.

    ransomwaredefense_evasionimpactexecution
  • Modifies boot configuration data using bcdedit 1 TTPs 4 IoCs
    ransomwareevasion
  • Deletes backup catalog 3 TTPs 2 IoCs

    Uses wbadmin.exe to inhibit system recovery.

    ransomware
  • Disables Task Manager via registry modification
    defense_evasion
  • Checks computer location settings 2 TTPs 3 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Creates a file in the Startup directory 1 TTPs 3 IoCs

    A file was written to a Windows startup folder. Files in these directories are executed automatically when a user logs on or an application initializes.

    persistenceprivilege_escalation
  • Executes dropped EXE 3 IoCs
  • Reads user/profile data of web browsers 3 TTPs

    Infostealers often target stored browser data, which can include saved credentials etc.

    spywarestealer
  • Adds Run key to start application 2 TTPs 2 IoCs
    persistence
  • Drops desktop.ini file(s) 64 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • Executes a command shell one-liner 1 TTPs 6 IoCs

    Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

    execution
  • Checks SCSI registry key(s) 3 TTPs 4 IoCs

    SCSI information is often read in order to detect sandboxing environments.

  • Interacts with shadow copies 3 TTPs 2 IoCs

    Shadow copies are often targeted by ransomware to inhibit system recovery.

    ransomware
  • Modifies registry class 56 IoCs
  • Opens file in notepad (likely ransom note) 2 IoCs
    ransomware
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of FindShellTrayWindow 1 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 21 IoCs
  • Uses Task Scheduler COM API 1 TTPs

    The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.

    persistence
  • Uses Volume Shadow Copy service COM API

    The Volume Shadow Copy service is used to manage backups/snapshots.

    ransomware

Processes

  • C:\Users\Admin\AppData\Local\Temp\Yashma ransomware builder v1.2.exe
    "C:\Users\Admin\AppData\Local\Temp\Yashma ransomware builder v1.2.exe"
    1⤵
    • Modifies registry class
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious behavior: GetForegroundWindowSpam
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:4952
    • C:\Windows\Microsoft.NET\Framework64\v4.0.30319\csc.exe
      "C:\Windows\Microsoft.NET\Framework64\v4.0.30319\csc.exe" /noconfig /fullpaths @"C:\Users\Admin\AppData\Local\Temp\i0m4nlsj\i0m4nlsj.cmdline"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:4616
      • C:\Windows\Microsoft.NET\Framework64\v4.0.30319\cvtres.exe
        C:\Windows\Microsoft.NET\Framework64\v4.0.30319\cvtres.exe /NOLOGO /READONLY /MACHINE:IX86 "/OUT:C:\Users\Admin\AppData\Local\Temp\RES313.tmp" "c:\Users\Admin\Desktop\CSCA56BB0CA4541F5BA91EC694B2A6C42.TMP"
        3⤵
          PID:2448
    • C:\Users\Admin\Desktop\67.exe
      "C:\Users\Admin\Desktop\67.exe"
      1⤵
      • Checks computer location settings
      • Executes dropped EXE
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:3392
      • C:\Users\Admin\AppData\Roaming\svchost.exe
        "C:\Users\Admin\AppData\Roaming\svchost.exe"
        2⤵
        • Checks computer location settings
        • Creates a file in the Startup directory
        • Executes dropped EXE
        • Adds Run key to start application
        • Drops desktop.ini file(s)
        • Modifies registry class
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:1316
        • C:\Windows\System32\cmd.exe
          "C:\Windows\System32\cmd.exe" /C vssadmin delete shadows /all /quiet & wmic shadowcopy delete
          3⤵
          • Executes a command shell one-liner
          • Suspicious use of WriteProcessMemory
          PID:4124
          • C:\Windows\system32\vssadmin.exe
            vssadmin delete shadows /all /quiet
            4⤵
            • Interacts with shadow copies
            PID:3664
          • C:\Windows\System32\Wbem\WMIC.exe
            wmic shadowcopy delete
            4⤵
            • Suspicious use of AdjustPrivilegeToken
            PID:3768
        • C:\Windows\System32\cmd.exe
          "C:\Windows\System32\cmd.exe" /C bcdedit /set {default} bootstatuspolicy ignoreallfailures & bcdedit /set {default} recoveryenabled no
          3⤵
          • Executes a command shell one-liner
          • Suspicious use of WriteProcessMemory
          PID:3220
          • C:\Windows\system32\bcdedit.exe
            bcdedit /set {default} bootstatuspolicy ignoreallfailures
            4⤵
            • Modifies boot configuration data using bcdedit
            PID:1916
          • C:\Windows\system32\bcdedit.exe
            bcdedit /set {default} recoveryenabled no
            4⤵
            • Modifies boot configuration data using bcdedit
            PID:4988
        • C:\Windows\System32\cmd.exe
          "C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet
          3⤵
          • Executes a command shell one-liner
          • Suspicious use of WriteProcessMemory
          PID:3584
          • C:\Windows\system32\wbadmin.exe
            wbadmin delete catalog -quiet
            4⤵
            • Deletes backup catalog
            PID:4216
        • C:\Windows\system32\NOTEPAD.EXE
          "C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Roaming\read_it.txt
          3⤵
          • Opens file in notepad (likely ransom note)
          PID:5064
    • C:\Windows\system32\vssvc.exe
      C:\Windows\system32\vssvc.exe
      1⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:888
    • C:\Users\Admin\AppData\Roaming\svchost.exe
      C:\Users\Admin\AppData\Roaming\svchost.exe
      1⤵
      • Checks computer location settings
      • Creates a file in the Startup directory
      • Executes dropped EXE
      • Adds Run key to start application
      • Drops desktop.ini file(s)
      • Modifies registry class
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:4108
      • C:\Windows\System32\cmd.exe
        "C:\Windows\System32\cmd.exe" /C vssadmin delete shadows /all /quiet & wmic shadowcopy delete
        2⤵
        • Executes a command shell one-liner
        • Suspicious use of WriteProcessMemory
        PID:5072
        • C:\Windows\system32\vssadmin.exe
          vssadmin delete shadows /all /quiet
          3⤵
          • Interacts with shadow copies
          PID:4824
        • C:\Windows\System32\Wbem\WMIC.exe
          wmic shadowcopy delete
          3⤵
          • Suspicious use of AdjustPrivilegeToken
          PID:2692
      • C:\Windows\System32\cmd.exe
        "C:\Windows\System32\cmd.exe" /C bcdedit /set {default} bootstatuspolicy ignoreallfailures & bcdedit /set {default} recoveryenabled no
        2⤵
        • Executes a command shell one-liner
        • Suspicious use of WriteProcessMemory
        PID:2220
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} bootstatuspolicy ignoreallfailures
          3⤵
          • Modifies boot configuration data using bcdedit
          PID:4392
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} recoveryenabled no
          3⤵
          • Modifies boot configuration data using bcdedit
          PID:2680
      • C:\Windows\System32\cmd.exe
        "C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet
        2⤵
        • Executes a command shell one-liner
        • Suspicious use of WriteProcessMemory
        PID:312
        • C:\Windows\system32\wbadmin.exe
          wbadmin delete catalog -quiet
          3⤵
          • Deletes backup catalog
          PID:4004
      • C:\Windows\system32\NOTEPAD.EXE
        "C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Roaming\read_it.txt
        2⤵
        • Opens file in notepad (likely ransom note)
        • Suspicious use of FindShellTrayWindow
        PID:3132
    • C:\Windows\system32\wbengine.exe
      "C:\Windows\system32\wbengine.exe"
      1⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:2656
    • C:\Windows\System32\vdsldr.exe
      C:\Windows\System32\vdsldr.exe -Embedding
      1⤵
        PID:4260
      • C:\Windows\System32\vds.exe
        C:\Windows\System32\vds.exe
        1⤵
        • Checks SCSI registry key(s)
        PID:4336
      • C:\Windows\system32\vssvc.exe
        C:\Windows\system32\vssvc.exe
        1⤵
        • Suspicious use of AdjustPrivilegeToken
        PID:3700

      Network

            MITRE ATT&CK Enterprise v16

            Reconnaissance

            Resource Development

            Initial Access

            Execution

            Command and Scripting Interpreter

            2
            T1059

            Windows Command Shell

            1
            T1059.003

            Windows Management Instrumentation

            1
            T1047

            Persistence

            Boot or Logon Autostart Execution

            2
            T1547

            Registry Run Keys / Startup Folder

            2
            T1547.001

            Privilege Escalation

            Boot or Logon Autostart Execution

            2
            T1547

            Registry Run Keys / Startup Folder

            2
            T1547.001

            Defense Evasion

            Direct Volume Access

            1
            T1006

            Indicator Removal

            3
            T1070

            File Deletion

            3
            T1070.004

            Modify Registry

            1
            T1112

            Credential Access

            Credentials from Password Stores

            1
            T1555

            Credentials from Web Browsers

            1
            T1555.003

            Unsecured Credentials

            1
            T1552

            Credentials In Files

            1
            T1552.001

            Discovery

            Peripheral Device Discovery

            1
            T1120

            Query Registry

            3
            T1012

            System Information Discovery

            3
            T1082

            Lateral Movement

            Collection

            Data from Local System

            1
            T1005

            Command and Control

            Exfiltration

            Impact

            Inhibit System Recovery

            4
            T1490

            Replay Monitor

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            Downloads

            read_it.txt
            • Path C:\ProgramData\Adobe\Setup\{AC76BA86-7AD7-1033-7B44-AC0F074E4100}\read_it.txt
            • Size 582B
            • SHA256 45726f2f29967ef016f8d556fb6468a577307d67388cc4530295a9ca10fdfa36
            • MD5 SHA1 SHA512 TLSH
            Submit Download

            67.exe.log
            • Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\67.exe.log
            • Size 660B
            • SHA256 3e004976bae302cf7c53f5d15b5175eecb851bd4eb49a9b9365f716a6ee27523
            • MD5 SHA1 SHA512 TLSH
            Submit Download

            svchost.exe.log
            • Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\svchost.exe.log
            • Size 888B
            • SHA256 10d050fd0819fc7c15ef1264e0a7b98df5b12d7365a57bad6f5785a57f3f456d
            • MD5 SHA1 SHA512 TLSH
            Submit Download

            RES313.tmp
            • Path C:\Users\Admin\AppData\Local\Temp\RES313.tmp
            • Size 1KB
            • SHA256 80abe570faca601531e6d2fd86f6e8775ddc09a387670ca97f5ffd012e090cfa
            • MD5 SHA1 SHA512 TLSH
            Submit Download

            67.exe
            • Path C:\Users\Admin\Desktop\67.exe
            • Size 27KB
            • SHA256 bd758318911777a0e9e2ba95b567cdce8a98cdb0bedffdcf810ba01249e45941
            • MD5 SHA1 SHA512 SSDEEP TLSH
            Submit Download

            Fax Recipient.lnk
            • Path C:\Users\Default\AppData\Roaming\Microsoft\Windows\SendTo\Fax Recipient.lnk
            • Size 1B
            • SHA256 8a8de823d5ed3e12746a62ef169bcf372be0ca44f0a1236abc35df05d96928e1
            • MD5 SHA1 SHA512
            Submit Download

            i0m4nlsj.0.cs
            • Path \??\c:\Users\Admin\AppData\Local\Temp\i0m4nlsj\i0m4nlsj.0.cs
            • Size 39KB
            • SHA256 df889eee169fcf456a4639dc0844976c6d5fd615e34a6380df69b85e290aec07
            • MD5 SHA1 SHA512 SSDEEP TLSH
            Submit Download

            i0m4nlsj.cmdline
            • Path \??\c:\Users\Admin\AppData\Local\Temp\i0m4nlsj\i0m4nlsj.cmdline
            • Size 384B
            • SHA256 2b8574f48fb4aad0bde5dbcf304c07e97c2b9d3242cbb7db7fa6a14d8512617b
            • MD5 SHA1 SHA512 TLSH
            Submit Download

            CSCA56BB0CA4541F5BA91EC694B2A6C42.TMP
            • Path \??\c:\Users\Admin\Desktop\CSCA56BB0CA4541F5BA91EC694B2A6C42.TMP
            • Size 1KB
            • SHA256 a5b1dccbcd5dccea3aaa1b55c20724a4802fe1e5cb5da187f010c07bc4f1d222
            • MD5 SHA1 SHA512 TLSH
            Submit Download

            memory/3392-26-0x0000000000DA0000-0x0000000000DAE000-memory.dmp
            Download

            memory/4952-7-0x000000001B070000-0x000000001B080000-memory.dmp
            Download

            memory/4952-0-0x0000000000300000-0x000000000038C000-memory.dmp
            Download

            memory/4952-6-0x000000001B070000-0x000000001B080000-memory.dmp
            Download

            memory/4952-23-0x00000000211B0000-0x000000002135E000-memory.dmp
            Download

            memory/4952-5-0x000000001B070000-0x000000001B080000-memory.dmp
            Download

            memory/4952-4-0x000000001B070000-0x000000001B080000-memory.dmp
            Download

            memory/4952-3-0x000000001B070000-0x000000001B080000-memory.dmp
            Download

            memory/4952-2-0x000000001B070000-0x000000001B080000-memory.dmp
            Download

            memory/4952-1-0x000000001B070000-0x000000001B080000-memory.dmp
            Download

            memory/4952-1604-0x00000000211B0000-0x000000002135E000-memory.dmp
            Download