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Analysis

  • max time kernel
    150s
  • max time network
    149s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240412-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240412-enlocale:en-usos:windows10-2004-x64system
  • submitted
    15/04/2024, 09:56

General

  • Target

    2024-04-15_8c27b54c42a9973e86315a04d4efd337_cryptolocker.exe

  • Size

    36KB

  • MD5

    8c27b54c42a9973e86315a04d4efd337

  • SHA1

    351114bb7538a8196c10fb911f71f26cf3887667

  • SHA256

    bea795bea1e9d040fe321e4363254fab1a2688b8eb61d037098762345e784fee

  • SHA512

    6b5e599e66793b4ecdc0a59bea7f97bf22ad2959af4fc8cb0817428a21c6b19aff3465cb08418f83283d347d152433baf89215f37e9b1465c4e89f381bfaa824

  • SSDEEP

    768:b/yC4GyNM01GuQMNXw2PSjHC02ltAUACe:b/pYayGig5HC02gbCe

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\2024-04-15_8c27b54c42a9973e86315a04d4efd337_cryptolocker.exe
    "C:\Users\Admin\AppData\Local\Temp\2024-04-15_8c27b54c42a9973e86315a04d4efd337_cryptolocker.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:2680
    • C:\Users\Admin\AppData\Local\Temp\retln.exe
      "C:\Users\Admin\AppData\Local\Temp\retln.exe"
      2⤵
      • Executes dropped EXE
      PID:964

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    36KB

    MD5

    4056a0f9d24fac7f3fea3e9576640b1d

    SHA1

    6edb79530c61e73c4bcbadb7eb8764a470a4744b

    SHA256

    63895bd98b56665ec385bb92d1c8fcef41f4702be082c8c4fe84f6373331aafd

    SHA512

    5dfbf22c8fb2da29ccc83c9e22b480a1eb3ec69f5ca46fc26d595c5793990d81cb5a8e5d6ce6776a4f424e034fc7ba46c617bceb97f02ee7467e7f098c0cf306

  • memory/964-20-0x0000000002120000-0x0000000002126000-memory.dmp

    Filesize

    24KB

  • memory/2680-0-0x0000000002340000-0x0000000002346000-memory.dmp

    Filesize

    24KB

  • memory/2680-1-0x0000000002340000-0x0000000002346000-memory.dmp

    Filesize

    24KB

  • memory/2680-2-0x0000000000400000-0x0000000000406000-memory.dmp

    Filesize

    24KB