Analysis

  • max time kernel
    141s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240226-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
  • submitted
    26/05/2024, 03:53

General

  • Target
    2024-05-26_bf3fb6d400a4d92aa174857933360e0b_cryptolocker.exe
  • Size 57KB
  • Sample240526-ef3k8sea21
  • SHA256 b80414f9014d0ceff4ee4f14c433797fba637c0b7984ccd7d6a507da9287f2a8
  • MD5 SHA1 SHA512 SSDEEP
Score
9/10

Malware Config

Signatures

  • Detection of CryptoLocker Variants 4 IoCs
  • Detection of Cryptolocker Samples 4 IoCs
  • Detects executables built or packed with MPress PE compressor 4 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\2024-05-26_bf3fb6d400a4d92aa174857933360e0b_cryptolocker.exe
    "C:\Users\Admin\AppData\Local\Temp\2024-05-26_bf3fb6d400a4d92aa174857933360e0b_cryptolocker.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:3232
    • 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:368
  • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
    "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=1420 --field-trial-handle=2272,i,4858140932023865871,5726683989663339295,262144 --variations-seed-version /prefetch:8
    1⤵
      PID:4584

    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 58KB
          • SHA256 e7c56123650f81a5d57df692af3020b669fe8b6359a53d1f3bd2769939bff85d
          • MD5 SHA1 SHA512 SSDEEP

          misids.exe

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

          memory/368-18-0x00000000004E0000-0x00000000004E6000-memory.dmp

          memory/368-19-0x0000000000590000-0x0000000000596000-memory.dmp

          memory/368-48-0x0000000000500000-0x0000000000510000-memory.dmp

          memory/3232-0-0x0000000000500000-0x0000000000510000-memory.dmp

          memory/3232-1-0x00000000005A0000-0x00000000005A6000-memory.dmp

          memory/3232-2-0x00000000005A0000-0x00000000005A6000-memory.dmp

          memory/3232-3-0x00000000005C0000-0x00000000005C6000-memory.dmp

          memory/3232-25-0x0000000000500000-0x0000000000510000-memory.dmp