Analysis

  • max time kernel
    141s
  • max time network
    124s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240419-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240419-enlocale:en-usos:windows10-2004-x64system
  • submitted
    29/04/2024, 19:56

General

  • Target
    2024-04-29_c87d8fc8c7e2ce5763622e187f1a8f8e_cryptolocker.exe
  • Size 36KB
  • Sample240429-yn248abf4w
  • SHA256 5ff3f27d80bc007a714ae5731ebe0363a05063950f7e16f5d1eb0cc474143b55
  • 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 10 IoCs
  • Suspicious use of WriteProcessMemory 3 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\2024-04-29_c87d8fc8c7e2ce5763622e187f1a8f8e_cryptolocker.exe
    "C:\Users\Admin\AppData\Local\Temp\2024-04-29_c87d8fc8c7e2ce5763622e187f1a8f8e_cryptolocker.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:1516
    • 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:3364

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 36KB
        • SHA256 5a6b76bf3a21a0b77201e4fff9a135a973f64794bcef9c7de38434195f54a9cd
        • MD5 SHA1 SHA512 SSDEEP

        misids.exe

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

        memory/1516-0-0x00000000004D0000-0x00000000004D6000-memory.dmp

        memory/1516-1-0x00000000004F0000-0x00000000004F6000-memory.dmp

        memory/1516-7-0x00000000004D0000-0x00000000004D6000-memory.dmp