Analysis

  • max time kernel
    142s
  • 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
    05/04/2024, 07:23

General

  • Target
    2024-04-05_05d4b660ba7229b4dd412acc7eb37f82_cryptolocker.exe
  • Size 47KB
  • Sample240405-h8bvrsec8t
  • SHA256 237459a8c14fabf1b20a6d9a2ec1ac0c82b6f6aa14b390ba774a0f81306d9619
  • MD5 SHA1 SHA512 SSDEEP
Score
9/10

Malware Config

Signatures

  • Detection of CryptoLocker Variants 5 IoCs
  • Detection of Cryptolocker Samples 5 IoCs
  • Detects executables built or packed with MPress PE compressor 5 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\2024-04-05_05d4b660ba7229b4dd412acc7eb37f82_cryptolocker.exe
    "C:\Users\Admin\AppData\Local\Temp\2024-04-05_05d4b660ba7229b4dd412acc7eb37f82_cryptolocker.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:3804
    • 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:1604
  • 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=3884 --field-trial-handle=2280,i,4114443225282860369,4764091921472631035,262144 --variations-seed-version /prefetch:8
    1⤵
      PID:3804

    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 47KB
          • SHA256 13de664beea21097e45067d520b0d37dc1574116c3672b2a47993a70225d7e50
          • MD5 SHA1 SHA512 SSDEEP

          misids.exe

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

          memory/1604-17-0x0000000000500000-0x0000000000510000-memory.dmp

          memory/1604-20-0x0000000002080000-0x0000000002086000-memory.dmp

          memory/1604-22-0x0000000002060000-0x0000000002066000-memory.dmp

          memory/1604-49-0x0000000000500000-0x0000000000510000-memory.dmp

          memory/3804-0-0x0000000000500000-0x0000000000510000-memory.dmp

          memory/3804-1-0x0000000002150000-0x0000000002156000-memory.dmp

          memory/3804-2-0x0000000002150000-0x0000000002156000-memory.dmp

          memory/3804-3-0x0000000002070000-0x0000000002076000-memory.dmp

          memory/3804-18-0x0000000000500000-0x0000000000510000-memory.dmp