Analysis

  • max time kernel
    51s
  • max time network
    52s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240508-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
  • submitted
    11/06/2024, 18:00

General

  • Target

    2024-06-11_88af66a07ddc2cdf772ce0806f196e0c_bkransomware.exe

  • Size

    71KB

  • MD5

    88af66a07ddc2cdf772ce0806f196e0c

  • SHA1

    50f217752cfd0ee87d3ea2a812ec482224e74bde

  • SHA256

    877b7a3b09c2ac8be387e08e18e761a5ef77dfcf570ad8a742bb9f6b9cc5031e

  • SHA512

    388a8f2a9f6f82601f4f1e393953674acf40cb17662a9ad573cb05479ffba04a80e086e59a6df24eb474819967380714831e98f1ef67e32aae9de6203ab8c224

  • SSDEEP

    1536:Fc897UsWjcd9w+AyabjDbxE+MwmvlDuazTO:ZhpAyazIlyazTO

Malware Config

Signatures

  • Executes dropped EXE 1 IoCs
  • Reads user/profile data of web browsers 2 TTPs

    Infostealers often target stored browser data, which can include saved credentials etc.

  • Adds Run key to start application 2 TTPs 2 IoCs
  • Drops file in Windows directory 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 3 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\2024-06-11_88af66a07ddc2cdf772ce0806f196e0c_bkransomware.exe
    "C:\Users\Admin\AppData\Local\Temp\2024-06-11_88af66a07ddc2cdf772ce0806f196e0c_bkransomware.exe"
    1⤵
    • Adds Run key to start application
    • Drops file in Windows directory
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1920
    • C:\Windows\CTS.exe
      "C:\Windows\CTS.exe"
      2⤵
      • Executes dropped EXE
      • Adds Run key to start application
      • Drops file in Windows directory
      • Suspicious use of AdjustPrivilegeToken
      PID:4444

Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

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        Downloads

        • C:\Users\Admin\AppData\Local\Microsoft\Office\16.0\excel.exe_Rules.xml

          Filesize

          394KB

          MD5

          8160a200297e7a390d8af933af0b9e33

          SHA1

          e729a70544d3eaa2e4f91961fd60cd4267be21c0

          SHA256

          9a9cd82e73cafc13b0101a6f043198fb0b809d92b0d34e54e3e29f89c621777a

          SHA512

          443f0d876abf3d0b0159732934323fbfbc7a1c87042033c793b68a192580c2d716234ef87610843c5e76adca60058861234c3ec95259e959be6cc4b5174006fc

        • C:\Users\Admin\AppData\Local\Temp\XqXc1i1RwaffjiH.exe

          Filesize

          71KB

          MD5

          c6982a4f5884324356f7d4260c5f3e8f

          SHA1

          9a1d0656f0ebe40caaeb2829ef9c3cae1e9415dd

          SHA256

          728be988ee90bfc1ac3a03afa7807d1bbefa7a74dc4dc12be42bf60297c9e8b7

          SHA512

          852d6845c45c76303a27d5f855bb7f8d3227a61c2d5cddd11ffc4ce029909c3e78baec0f0e2cb974f7789fb5ce43b69be082925958f672726417cff5716e9384

        • C:\Windows\CTS.exe

          Filesize

          71KB

          MD5

          66df4ffab62e674af2e75b163563fc0b

          SHA1

          dec8a197312e41eeb3cfef01cb2a443f0205cd6e

          SHA256

          075a6eecd8da1795532318f9cf880efe42461f9464d63f74deb271d33110f163

          SHA512

          1588dd78e6e8972013c40cdb6acfb84c8df7b081197233ce621904b645356c805d0424bb93dd46c55834dc47d9ff39ee1323cf8e670841b3fff24ab98ba87f25