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Analysis

  • max time kernel
    151s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231020-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231020-enlocale:en-usos:windows10-2004-x64system
  • submitted
    22/10/2023, 16:47

General

  • Target

    sample.exe

  • Size

    129KB

  • MD5

    c50a3e0b68062be34e05f6761f0f75ff

  • SHA1

    0cb1fea6f126d57977ca84ad68a3f758ca745c7a

  • SHA256

    9fb8f797f53dceb4731688f8688eccbe7d137665d7f2542070e2b2cf7371a6ce

  • SHA512

    126b08fd7ee107929869ef39ad226a9089be6e46e5fb077929e692195505c25b159663415c0eb7754ab2b9a1154943e6e48c37a5b157be3f386ef0984bb781ba

  • SSDEEP

    3072:iLbLpVIYbQf91G3im/2Ef07Jysgxv8Ofr4pt6Y46ab6koEMQBfjS3f2vYeBgrOi4:iTpVLvxyq6ko0BSveYprzOu3Scur06

Score
9/10

Malware Config

Signatures

  • Deletes shadow copies 2 TTPs

    Ransomware often targets backup files to inhibit system recovery.

  • Renames multiple (3045) files with added filename extension

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

  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Enumerates connected drives 3 TTPs 2 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).

  • Interacts with shadow copies 2 TTPs 1 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 12 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of WriteProcessMemory 4 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\sample.exe
    "C:\Users\Admin\AppData\Local\Temp\sample.exe"
    1⤵
    • Checks computer location settings
    • Enumerates connected drives
    • Drops file in Program Files directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:4384
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /c vssadmin.exe delete shadows /all /quiet
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:2580
      • C:\Windows\system32\vssadmin.exe
        vssadmin.exe delete shadows /all /quiet
        3⤵
        • Interacts with shadow copies
        PID:2780
  • C:\Windows\system32\vssvc.exe
    C:\Windows\system32\vssvc.exe
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:464
  • C:\Program Files\Common Files\Microsoft Shared\ClickToRun\OfficeClickToRun.exe
    "C:\Program Files\Common Files\Microsoft Shared\ClickToRun\OfficeClickToRun.exe" /service
    1⤵
      PID:2664
    • C:\Windows\system32\NOTEPAD.EXE
      "C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\Desktop\FILE ENCRYPTED.txt
      1⤵
        PID:3476
      • C:\Windows\system32\NOTEPAD.EXE
        "C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\Desktop\FILE ENCRYPTED.txt
        1⤵
          PID:2488
        • C:\Windows\system32\NOTEPAD.EXE
          "C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\Desktop\FILE ENCRYPTED.txt
          1⤵
            PID:752
          • C:\Windows\system32\NOTEPAD.EXE
            "C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\Desktop\FILE ENCRYPTED.txt
            1⤵
              PID:1612

            Network

            MITRE ATT&CK Enterprise v15

            Replay Monitor

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            Downloads

            • C:\Program Files (x86)\FILE ENCRYPTED.txt

              Filesize

              324B

              MD5

              22542390ac223bcff3281bd5530a7a4d

              SHA1

              3d0e18b8902e53b8f52da850ff61403c12a7278f

              SHA256

              84e36a6742490dfcc203ce8944fadabb57782e947143d67baeb0aff23d2b71f5

              SHA512

              65aa3d079652d6877170726c4c6ac230d8698b0d0bfab4f7fb90f87a4f6b9cf3d0bbad419cae14f82728f643369da16cfa3460dffa5bf872c97f864d11b201f6

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

              Filesize

              324B

              MD5

              22542390ac223bcff3281bd5530a7a4d

              SHA1

              3d0e18b8902e53b8f52da850ff61403c12a7278f

              SHA256

              84e36a6742490dfcc203ce8944fadabb57782e947143d67baeb0aff23d2b71f5

              SHA512

              65aa3d079652d6877170726c4c6ac230d8698b0d0bfab4f7fb90f87a4f6b9cf3d0bbad419cae14f82728f643369da16cfa3460dffa5bf872c97f864d11b201f6