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Analysis

  • max time kernel
    150s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231215-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
  • submitted
    04/02/2024, 01:42

General

  • Target

    2024-02-04_7af809d0746d698093e820a1d7a79449_cryptolocker.exe

  • Size

    41KB

  • MD5

    7af809d0746d698093e820a1d7a79449

  • SHA1

    87b642207feee28831dca098c027b2a29e937088

  • SHA256

    21722edb67a6233676f716930b03dae0f8647a78d839c297eadd24738913a847

  • SHA512

    e8a6855760c744fd66eff58793156f470ec501b562d9656cd2070d315ae1103c9ce26b68c34fd05854a36af90f5067aaa4ad85825fe92ddafeef56b247cd967a

  • SSDEEP

    768:b/yC4GyNM01GuQMNXw2PSjHPbSuYlW8PAaV:b/pYayGig5HjS3NPAu

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\2024-02-04_7af809d0746d698093e820a1d7a79449_cryptolocker.exe
    "C:\Users\Admin\AppData\Local\Temp\2024-02-04_7af809d0746d698093e820a1d7a79449_cryptolocker.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4980
    • C:\Users\Admin\AppData\Local\Temp\retln.exe
      "C:\Users\Admin\AppData\Local\Temp\retln.exe"
      2⤵
      • Executes dropped EXE
      PID:4756

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    41KB

    MD5

    2622930b6c12564cf9cc5863e74e46e6

    SHA1

    943ed8bf42c1f7f363cd0f4540f51a119b8b9807

    SHA256

    480c93b99f64958a05b8b7d23db47b23881b07682433f0b14ac3a6075585c8ab

    SHA512

    2e5b34315a9ce716269d3afca493a1d4c6e092ce259d12529ec5900316de163e8076222325b8568ec8fc5ec5decbb436295b06a724e6472d8271686acdb306a0

  • memory/4756-25-0x0000000002090000-0x0000000002096000-memory.dmp

    Filesize

    24KB

  • memory/4980-0-0x0000000002EA0000-0x0000000002EA6000-memory.dmp

    Filesize

    24KB

  • memory/4980-1-0x0000000002EA0000-0x0000000002EA6000-memory.dmp

    Filesize

    24KB

  • memory/4980-2-0x0000000000400000-0x0000000000406000-memory.dmp

    Filesize

    24KB