Analysis

  • max time kernel
    140s
  • max time network
    171s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231215-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
  • submitted
    18-01-2024 23:16

General

  • Target

    2024-01-18_b86c9fdeff8a699c26bb94b28bd0a32c_cryptolocker.exe

  • Size

    86KB

  • MD5

    b86c9fdeff8a699c26bb94b28bd0a32c

  • SHA1

    8b0a1c51db60c4b167f9740621473fcaaeabf042

  • SHA256

    749bd2cfe318c16717bd5694ebd3fbc61b0be4320c78b3fed913f115a4636212

  • SHA512

    b9613c1a4b5abb8d443db9347e13eb44625995ab16a66c4fa5d89d4c41129792a01ffc305bbd7e533249cf27dba61b6737ff7a4cee7d44cad11439930559f784

  • SSDEEP

    1536:zj+soPSMOtEvwDpj4ktBl01hJl8QAPM8Ho6cRMy8r:zCsanOtEvwDpj/

Score
9/10
upx

Malware Config

Signatures

  • Detection of CryptoLocker Variants 4 IoCs
  • Detection of Cryptolocker Samples 4 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 6 IoCs
  • Suspicious use of WriteProcessMemory 3 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\2024-01-18_b86c9fdeff8a699c26bb94b28bd0a32c_cryptolocker.exe
    "C:\Users\Admin\AppData\Local\Temp\2024-01-18_b86c9fdeff8a699c26bb94b28bd0a32c_cryptolocker.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4864
    • 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:2732

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    86KB

    MD5

    58db6c17726e7995507440122e46bf32

    SHA1

    5b2909d8bfbadfc701b9c04c591e1fce15e894ea

    SHA256

    ea134c2b6867daaa49a41f72b1ad10551fd63117e6aa5bf06c4a685d01487613

    SHA512

    90ecb83c2fe1bf35a02635f63e4555deb1c77934e653fd2fe2ca9df3279b8c65502f737750100abcc684b3f887531be57488554abe3fe5a9efe0ab42844195f0

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

    Filesize

    315B

    MD5

    a34ac19f4afae63adc5d2f7bc970c07f

    SHA1

    a82190fc530c265aa40a045c21770d967f4767b8

    SHA256

    d5a89e26beae0bc03ad18a0b0d1d3d75f87c32047879d25da11970cb5c4662a3

    SHA512

    42e53d96e5961e95b7a984d9c9778a1d3bd8ee0c87b8b3b515fa31f67c2d073c8565afc2f4b962c43668c4efa1e478da9bb0ecffa79479c7e880731bc4c55765

  • memory/2732-21-0x00000000004D0000-0x00000000004D6000-memory.dmp

    Filesize

    24KB

  • memory/2732-19-0x00000000004F0000-0x00000000004F6000-memory.dmp

    Filesize

    24KB

  • memory/2732-48-0x0000000000500000-0x0000000000510000-memory.dmp

    Filesize

    64KB

  • memory/4864-0-0x0000000000500000-0x0000000000510000-memory.dmp

    Filesize

    64KB

  • memory/4864-1-0x0000000000560000-0x0000000000566000-memory.dmp

    Filesize

    24KB

  • memory/4864-2-0x0000000000560000-0x0000000000566000-memory.dmp

    Filesize

    24KB

  • memory/4864-3-0x00000000006C0000-0x00000000006C6000-memory.dmp

    Filesize

    24KB

  • memory/4864-17-0x0000000000500000-0x0000000000510000-memory.dmp

    Filesize

    64KB