Analysis

  • max time kernel
    78s
  • max time network
    124s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240426-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240426-enlocale:en-usos:windows10-2004-x64system
  • submitted
    29/05/2024, 08:27

General

  • Target
    2024-05-29_614fdbd72bd513c7054b20678409dbc6_cryptolocker.exe
  • Size 81KB
  • Sample240529-kct3kshc72
  • SHA256 4efa4fccf0ecc972685400099f3fee679ba44009ab8dbcda8ef4b62af356f760
  • MD5 SHA1 SHA512 SSDEEP
Score
9/10

Malware Config

Signatures

  • Detection of CryptoLocker Variants 1 IoCs
  • Detection of Cryptolocker Samples 1 IoCs
  • Checks computer location settings 2 TTPs 2 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).

  • Modifies system certificate store 2 TTPs 8 IoCs
  • Suspicious use of WriteProcessMemory 3 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\2024-05-29_614fdbd72bd513c7054b20678409dbc6_cryptolocker.exe
    "C:\Users\Admin\AppData\Local\Temp\2024-05-29_614fdbd72bd513c7054b20678409dbc6_cryptolocker.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:2404
    • C:\Users\Admin\AppData\Local\Temp\misid.exe
      "C:\Users\Admin\AppData\Local\Temp\misid.exe"
      2⤵
      • Checks computer location settings
      • Executes dropped EXE
      • Modifies system certificate store
      PID:1036

Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

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        Downloads

        misid.exe

        • Path C:\Users\Admin\AppData\Local\Temp\misid.exe
        • Size 81KB
        • SHA256 27c579a816e0227d9a88a03a4167a74106e17a6845f9bedf32d009283d460991
        • MD5 SHA1 SHA512 SSDEEP

        misids.exe

        • Path C:\Users\Admin\AppData\Local\Temp\misids.exe
        • Size 315B
        • SHA256 d5a89e26beae0bc03ad18a0b0d1d3d75f87c32047879d25da11970cb5c4662a3
        • MD5 SHA1 SHA512

        memory/1036-17-0x00000000005E0000-0x00000000005E6000-memory.dmp

        memory/2404-0-0x00000000004E0000-0x00000000004E6000-memory.dmp

        memory/2404-1-0x00000000004E0000-0x00000000004E6000-memory.dmp

        memory/2404-2-0x0000000000660000-0x0000000000666000-memory.dmp