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Overview

overview

9

Static

static

3

Crypter.exe

windows7-x64

9

Crypter.exe

windows10-2004-x64

9

Analysis

  • max time kernel
    126s
  • max time network
    127s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230621-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230621-enlocale:en-usos:windows10-2004-x64system
  • submitted
    28/06/2023, 14:53

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General

  • Target

    Crypter.exe

  • Size

    141KB

  • MD5

    26156564a104eae0cc9b06306a63ed9a

  • SHA1

    a81e06b82d233c813b8803ce1c608b83cbbba8e6

  • SHA256

    f1bb5ce204bc9e9fd12c3cb8c376e36e9ab47528c7c1ca865b38b8bd02314fc9

  • SHA512

    f5d502ded9705a7dc53243d9dfae2095f95fbbc288a737f2d4259caa8a6ecbc6b256d786fae042d12af4931b79033540ef0aee98fc6a5ed99539fc7a122b7c98

  • SSDEEP

    3072:4qHmFIAcneRB2ukEtRJ2XgqNjjCvvkfV7mF:JmsexkEt2hWCm

Score
9/10
ransomwarespywarestealer

Malware Config

Signatures

  • Deletes shadow copies 2 TTPs

    Ransomware often targets backup files to inhibit system recovery.

    ransomware
  • Renames multiple (8044) files with added filename extension

    This suggests ransomware activity of encrypting all the files on the system.

    ransomware
  • Modifies extensions of user files 21 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.

  • Executes dropped EXE 1 IoCs
  • 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 25 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).

  • Creates scheduled task(s) 1 TTPs 1 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

    persistence
  • 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 10 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 26 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 AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3596
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c SCHTASKS.exe /Create /RU "NT AUTHORITY\SYSTEM" /sc onstart /TN "Windows Update BETA" /TR "C:\Users\Admin\AppData\Local\Temp\Crypter.exe" /F
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:1284
      • C:\Windows\SysWOW64\schtasks.exe
        SCHTASKS.exe /Create /RU "NT AUTHORITY\SYSTEM" /sc onstart /TN "Windows Update BETA" /TR "C:\Users\Admin\AppData\Local\Temp\Crypter.exe" /F
        3⤵
        • Creates scheduled task(s)
        PID:4212
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /c vssadmin.exe delete shadows /all /quiet
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:4200
      • C:\Windows\system32\vssadmin.exe
        vssadmin.exe delete shadows /all /quiet
        3⤵
        • Interacts with shadow copies
        PID:1860
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /c vssadmin.exe delete shadows /all /quiet
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:3772
      • C:\Windows\system32\vssadmin.exe
        vssadmin.exe delete shadows /all /quiet
        3⤵
        • Interacts with shadow copies
        PID:2828
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c "C:\Users\Admin\AppData\Local\Temp\L11.tmp"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:2008
      • C:\Users\Admin\AppData\Local\Temp\L11.tmp
        C:\Users\Admin\AppData\Local\Temp\L11.tmp
        3⤵
        • Executes dropped EXE
        PID:2580
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c SCHTASKS.exe /Delete /TN "Windows Update BETA" /F
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:4260
      • C:\Windows\SysWOW64\schtasks.exe
        SCHTASKS.exe /Delete /TN "Windows Update BETA" /F
        3⤵
          PID:3124
    • C:\Windows\system32\vssvc.exe
      C:\Windows\system32\vssvc.exe
      1⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:1196
    • 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:944

    Network

    MITRE ATT&CK Enterprise v6

    Replay Monitor

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    Downloads

    • C:\Program Files (x86)\resq_Recovery.txt
      Filesize

      690B

      MD5

      557f56a43cfbac7ddf83eeefb5aaeaa6

      SHA1

      0a9a5a5d46c60dd3d2acaae5e0a7c5bfd2677c4a

      SHA256

      3aa1bc73e902b58f6ab3dc7ff49e71e355eae50ae00448b554c8c509e99f4c78

      SHA512

      1c1c5cf1101195f19036ac7f2cd1addb3412ae53401801443becfa708bbe9ed3198093455a608947af5a211dc787913f06902c10e3c850d0272cac69df4993df

      Download Submit

    • C:\Users\Admin\AppData\Local\Packages\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\TempState\StartUnifiedTileModelCache.dat
      Filesize

      14KB

      MD5

      b0f5cb1b6be68b3bfdccf8649a050932

      SHA1

      04afc85ea03c3d44e77ab20b709912074b0aed3a

      SHA256

      ec7e87459bc15903599323dd9682e0530ba557d00eeb55f51827c238134846bb

      SHA512

      0b8774b5a5dbb006dc902a1c981a0560bd570b8d5a944b8e8f23e7f05ab64fc513eabde0798cd70f8d39b4cdf15156fc05912a9c35656612169e188c8e5d3a0c

      Download Submit

    • C:\Users\Admin\AppData\Local\Packages\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\TempState\StartUnifiedTileModelCache.dat
      Filesize

      14KB

      MD5

      91caab83fd5d5a5bddfa156d8519aeeb

      SHA1

      23ec16606ca444d622219cf2eab59b4f35990de8

      SHA256

      5517768e386a73f9628858b8521cd0309361197add51055d4fc15b42d6a9cc15

      SHA512

      a6930247b0154ce8260ed6502117aa6cfd8a6f6601e3b4d85140bdb7031c32db98282cc231062937deda28e1444d7a48efca2aa673c643f7fa7e09bf8c306afe

      Download Submit

    • C:\Users\Admin\AppData\Local\Temp\L11.tmp
      Filesize

      5KB

      MD5

      ab65af4349e7c5b0872c8b808d036980

      SHA1

      414b2a2748b7ea6176c1d2453f89fdc8a2d349d0

      SHA256

      a6c41f368f42a7c57c307a48ce2440a60a744226b6414fadb6517a80a5d160a2

      SHA512

      2c61c56e8c299677bad4ce223e3187200c341aa4dd4503fac1217aa8e15687af03544a6d160bb2b1b131a56ea9df2967e00359aa622f12d1b82605c40cca6679

      Download Submit

    • C:\Users\Admin\AppData\Local\Temp\L11.tmp
      Filesize

      5KB

      MD5

      ab65af4349e7c5b0872c8b808d036980

      SHA1

      414b2a2748b7ea6176c1d2453f89fdc8a2d349d0

      SHA256

      a6c41f368f42a7c57c307a48ce2440a60a744226b6414fadb6517a80a5d160a2

      SHA512

      2c61c56e8c299677bad4ce223e3187200c341aa4dd4503fac1217aa8e15687af03544a6d160bb2b1b131a56ea9df2967e00359aa622f12d1b82605c40cca6679

      Download Submit