Analysis

  • max time kernel
    145s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240221-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240221-enlocale:en-usos:windows10-2004-x64system
  • submitted
    23/02/2024, 12:27

General

  • Target

    2024-02-23_1bd5cb923fea1755e53d319b1c49d7be_cryptolocker.exe

  • Size

    37KB

  • MD5

    1bd5cb923fea1755e53d319b1c49d7be

  • SHA1

    2017db7519b57033a6ba6e7844c49a0e4853be30

  • SHA256

    fcb5bc70a3b13a8135442a155b8f999581767d84b8cf3557dc6bab6306185ca7

  • SHA512

    73b14076475b306e4134231f603c53fe32b93490055dc9e122c05041089e1aee85b17652cc1e9d2a41d879894be1dccf575f13a58d53556368bc2ea7512b6484

  • SSDEEP

    384:bM7Q0pjC4GybxMv01d3AcASBQMf6i/zzzcYgUPSznHzl6AJvDSuVuAn:b/yC4GyNM01GuQMNXw2PSjHPbSuF

Score
9/10

Malware Config

Signatures

  • Detection of CryptoLocker Variants 1 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Executes dropped EXE 1 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Suspicious use of WriteProcessMemory 3 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\2024-02-23_1bd5cb923fea1755e53d319b1c49d7be_cryptolocker.exe
    "C:\Users\Admin\AppData\Local\Temp\2024-02-23_1bd5cb923fea1755e53d319b1c49d7be_cryptolocker.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:3288
    • C:\Users\Admin\AppData\Local\Temp\retln.exe
      "C:\Users\Admin\AppData\Local\Temp\retln.exe"
      2⤵
      • Executes dropped EXE
      PID:456

Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

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        Downloads

        • C:\Users\Admin\AppData\Local\Temp\retln.exe

          Filesize

          37KB

          MD5

          7d40a10a9bb27fd90e190868a844a024

          SHA1

          23d24b050f577c6e3e0eced626c43e7dcbd9a4b3

          SHA256

          5837ded4dfaef4379e46713d72516953a87b2a49adc2e51ecc710066eb494c64

          SHA512

          ebb36f7a13068c188d25019098d5f9f94b83a2f95f4ed548cc243eee578c2fa99054ce30f673cb2fdbd3f06cdd4020b746e4479c8cf3ffed30ccf6886e2121ec

        • memory/456-20-0x0000000000750000-0x0000000000756000-memory.dmp

          Filesize

          24KB

        • memory/3288-0-0x0000000002350000-0x0000000002356000-memory.dmp

          Filesize

          24KB

        • memory/3288-1-0x0000000002350000-0x0000000002356000-memory.dmp

          Filesize

          24KB

        • memory/3288-2-0x0000000000400000-0x0000000000406000-memory.dmp

          Filesize

          24KB