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Analysis

  • max time kernel
    135s
  • max time network
    125s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240426-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240426-enlocale:en-usos:windows10-2004-x64system
  • submitted
    21/05/2024, 23:40

General

  • Target

    2024-05-21_6d3db44f8894645eee81ee8b136538a4_cryptolocker.exe

  • Size

    71KB

  • MD5

    6d3db44f8894645eee81ee8b136538a4

  • SHA1

    a9e3ed87eb08b8bae6a344a193e996593cf62903

  • SHA256

    08c3fe318c6ba9beef467e0b745e3dbb00785e0764880836f1d136f5fd178e67

  • SHA512

    889e908c736e33bb71b1961e9b2f0e8dbdbce57aac9b390dc9d42eed3ad7b75d7809bf2288097c49668f1d1e33e78abaff2af914211c7b866b9398c4bf1df0e2

  • SSDEEP

    1536:nj+4zs2cPVhlMOtEvwDpj4H8u8rZVTs9Hd:C4Q2c94OtEvwDpj4H8z8

Score
9/10
upx

Malware Config

Signatures

  • Detection of CryptoLocker Variants 4 IoCs
  • Detection of Cryptolocker Samples 2 IoCs
  • UPX dump on OEP (original entry point) 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
  • UPX packed file 4 IoCs

    Detects executables packed with UPX/modified UPX open source packer.

  • 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\2024-05-21_6d3db44f8894645eee81ee8b136538a4_cryptolocker.exe
    "C:\Users\Admin\AppData\Local\Temp\2024-05-21_6d3db44f8894645eee81ee8b136538a4_cryptolocker.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:1608
    • 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:1540

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    71KB

    MD5

    7cac1e1ba0da324602d08f83692205ea

    SHA1

    5fc6fcdca50d20dde0ac93c5899549434b618a33

    SHA256

    b6c0e9b4c50861c0e6783b1c22c051b2089bb35991409c31f31083d247060bbe

    SHA512

    f61d4753e597b380720b14db383ecfcf0a0fe7233b2d9013dfe2414b44fdc18f8efd07fcb39985a1f26f408358e755f9870aee082002e205fa6bedcc7b0be309

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

    Filesize

    315B

    MD5

    a34ac19f4afae63adc5d2f7bc970c07f

    SHA1

    a82190fc530c265aa40a045c21770d967f4767b8

    SHA256

    d5a89e26beae0bc03ad18a0b0d1d3d75f87c32047879d25da11970cb5c4662a3

    SHA512

    42e53d96e5961e95b7a984d9c9778a1d3bd8ee0c87b8b3b515fa31f67c2d073c8565afc2f4b962c43668c4efa1e478da9bb0ecffa79479c7e880731bc4c55765

  • memory/1540-20-0x0000000000750000-0x0000000000756000-memory.dmp

    Filesize

    24KB

  • memory/1540-26-0x0000000000730000-0x0000000000736000-memory.dmp

    Filesize

    24KB

  • memory/1540-50-0x0000000000500000-0x0000000000510000-memory.dmp

    Filesize

    64KB

  • memory/1608-0-0x0000000000500000-0x0000000000510000-memory.dmp

    Filesize

    64KB

  • memory/1608-1-0x00000000005B0000-0x00000000005B6000-memory.dmp

    Filesize

    24KB

  • memory/1608-2-0x00000000005D0000-0x00000000005D6000-memory.dmp

    Filesize

    24KB

  • memory/1608-9-0x00000000005B0000-0x00000000005B6000-memory.dmp

    Filesize

    24KB

  • memory/1608-18-0x0000000000500000-0x0000000000510000-memory.dmp

    Filesize

    64KB