Resubmissions

28-03-2023 07:33

230328-jdsqgabd7x 9

28-03-2023 06:55

230328-hpt71ahe24 9

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

General

  • Target

    Crypter.exe

  • Size

    129KB

  • MD5

    9c62af504ce79cc4c0bbcc2612f3c4db

  • SHA1

    37c01dc0342c161569e9d434246dc42962c00860

  • SHA256

    43c9c228baf00bc4614fdeb578eb84ad2232cef6c2820046b0b9fec502be573f

  • SHA512

    3572b9dde32844ba873de6c994dcf42e71bc217806390d6cf9d767d4c837266592087837aa70991604e3bd283a27a6e11d1d48177996213e8575326f86f839f3

  • SSDEEP

    3072:qLbLpVIYbQf91G3im/2Ef07JysgNv8Ofr4pt6Y46ab6koEMQBfjS3f2vYeBgrOi4:qTpVXvxyq6ko0BSveYprzOu3ScuT06

Malware Config

Signatures

  • Deletes shadow copies 2 TTPs

    Ransomware often targets backup files to inhibit system recovery.

  • Modifies extensions of user files 1 IoCs

    Ransomware generally changes the extension on encrypted files.

  • 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.

  • 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.

  • 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.

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 Matrix ATT&CK v6

        Defense Evasion

        File Deletion

        2
        T1107

        Credential Access

        Credentials in Files

        1
        T1081

        Discovery

        Query Registry

        2
        T1012

        System Information Discovery

        3
        T1082

        Peripheral Device Discovery

        1
        T1120

        Collection

        Data from Local System

        1
        T1005

        Impact

        Inhibit System Recovery

        2
        T1490

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        • C:\ProgramData\#FILE ENCRYPTED.txt
          Filesize

          332B

          MD5

          94250996214fbc1194e5d00ca0472059

          SHA1

          4aa601fd325613df0d1e070cd9b97aaeba31033e

          SHA256

          9dbda2ff049da53281eb3336461d309b8da1de14c11169187dcfc08dcbfe4b7d

          SHA512

          8ff4dfbe8cfd6c7ab86d045827a3fa79303f77e6fa4c9ef1d5000cbf36e9a8b8c397ec2fc98de341305151872e7a50e9184a385fc703907384cb5fdaba57938f

        • C:\Users\Admin\AppData\Local\Packages\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\TempState\~tartUnifiedTileModelCache.tmp
          Filesize

          14KB

          MD5

          d1526c611fbfa91ce5d14239ae65da65

          SHA1

          9a0e562796985467c8e64545427f13506a4e7487

          SHA256

          167aa904fbe7aab5885a364596c3f01efca69badbb90ca8c2660ea3e46ec4ae2

          SHA512

          94e5601e35a84ac3d8838ff2ee45c60a2072a5e030fdfbb6e518f731b88b56e0da4b002d34129598d64e8025274aef8a0e44ca82ddb32c8214073def3740105d

        • C:\Users\Admin\Desktop\#FILE ENCRYPTED.txt
          Filesize

          332B

          MD5

          94250996214fbc1194e5d00ca0472059

          SHA1

          4aa601fd325613df0d1e070cd9b97aaeba31033e

          SHA256

          9dbda2ff049da53281eb3336461d309b8da1de14c11169187dcfc08dcbfe4b7d

          SHA512

          8ff4dfbe8cfd6c7ab86d045827a3fa79303f77e6fa4c9ef1d5000cbf36e9a8b8c397ec2fc98de341305151872e7a50e9184a385fc703907384cb5fdaba57938f