Overview

overview

9

Static

static

1

Crypter.exe

windows7-x64

9

Crypter.exe

windows10-2004-x64

9

Resubmissions

02/06/2023, 08:06

230602-jzfm2aah7y

28/03/2023, 07:33

230328-jdsqgabd7x9

28/03/2023, 06:55

230328-hpt71ahe249

Analysis

  • max time kernel
    132s
  • max time network
    132s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230221-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230221-enlocale:en-usos:windows10-2004-x64system
  • submitted
    28/03/2023, 06:55

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General

  • Target
    Crypter.exe
  • Size 129KB
  • Sample230328-hpt71ahe24
  • SHA256 43c9c228baf00bc4614fdeb578eb84ad2232cef6c2820046b0b9fec502be573f
  • MD5 SHA1 SHA512 SSDEEP
Score
9/10
ransomwarespywarestealer

Malware Config

Signatures

  • Deletes shadow copies 2 TTPs

    Ransomware often targets backup files to inhibit system recovery.

    ransomware
  • Modifies extensions of user files 1 IoCs

    Ransomware generally changes the extension on encrypted files.

    ransomware
  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Reads user/profile data of web browsers 2 TTPs

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

    spywarestealer
  • Enumerates connected drives 3 TTPs 1 IoCs

    Attempts to read the root path of hard drives other than the default C: drive.

  • Drops file in Program Files directory 64 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Interacts with shadow copies 2 TTPs 2 IoCs

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

    ransomware
  • Modifies registry class 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 8 IoCs
  • 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\Crypter.exe
    "C:\Users\Admin\AppData\Local\Temp\Crypter.exe"
    1⤵
    • Modifies extensions of user files
    • Checks computer location settings
    • Enumerates connected drives
    • Drops file in Program Files directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:4568
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /c vssadmin.exe delete shadows /all /quiet
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:4572
      • C:\Windows\system32\vssadmin.exe
        vssadmin.exe delete shadows /all /quiet
        3⤵
        • Interacts with shadow copies
        PID:224
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /c vssadmin.exe delete shadows /all /quiet
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:3224
      • C:\Windows\system32\vssadmin.exe
        vssadmin.exe delete shadows /all /quiet
        3⤵
        • Interacts with shadow copies
        PID:4876
  • C:\Windows\system32\vssvc.exe
    C:\Windows\system32\vssvc.exe
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:8
  • C:\Program Files\Common Files\Microsoft Shared\ClickToRun\OfficeClickToRun.exe
    "C:\Program Files\Common Files\Microsoft Shared\ClickToRun\OfficeClickToRun.exe" /service
    1⤵
      PID:444
    • C:\Windows\SystemApps\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\StartMenuExperienceHost.exe
      "C:\Windows\SystemApps\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\StartMenuExperienceHost.exe" -ServerName:App.AppXywbrabmsek0gm3tkwpr5kwzbs55tkqay.mca
      1⤵
      • Modifies registry class
      • Suspicious use of SetWindowsHookEx
      PID:6072
    • C:\Windows\system32\NOTEPAD.EXE
      "C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\Desktop\#FILE ENCRYPTED.txt
      1⤵
        PID:5204
      • C:\Windows\System32\rundll32.exe
        C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
        1⤵
          PID:5144

        Network

              MITRE ATT&CK Enterprise v6

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              Downloads

              #FILE ENCRYPTED.txt
              • Path C:\ProgramData\#FILE ENCRYPTED.txt
              • Size 332B
              • SHA256 9dbda2ff049da53281eb3336461d309b8da1de14c11169187dcfc08dcbfe4b7d
              • MD5 SHA1 SHA512
              Submit Download

              ~tartUnifiedTileModelCache.tmp
              • Path C:\Users\Admin\AppData\Local\Packages\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\TempState\~tartUnifiedTileModelCache.tmp
              • Size 14KB
              • SHA256 167aa904fbe7aab5885a364596c3f01efca69badbb90ca8c2660ea3e46ec4ae2
              • MD5 SHA1 SHA512 SSDEEP
              Submit Download

              #FILE ENCRYPTED.txt
              • Path C:\Users\Admin\Desktop\#FILE ENCRYPTED.txt
              • Size 332B
              • SHA256 9dbda2ff049da53281eb3336461d309b8da1de14c11169187dcfc08dcbfe4b7d
              • MD5 SHA1 SHA512
              Submit Download