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Analysis

  • max time kernel
    129s
  • max time network
    124s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240419-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240419-enlocale:en-usos:windows10-2004-x64system
  • submitted
    04/05/2024, 02:28

General

  • Target

    2024-05-04_793c19d1b1924506d07f20a7f5221d9b_bkransomware.exe

  • Size

    71KB

  • MD5

    793c19d1b1924506d07f20a7f5221d9b

  • SHA1

    a40b74ddac18599e3fbe01abee0d4439e24c6dd4

  • SHA256

    9dba025eae42a0332374d1f2e6c28dd3db6140ee2e30eacb1f45c1e6952d6b5e

  • SHA512

    2d934cc17375d4da37ed4ce11e69420b0eaf34598ce20cb879836468f736eae392a6ec9b112a3bbb3a6c8594e85484cc8c2958a8306528912d1f3f84f5260b2e

  • SSDEEP

    1536:Fc897UsWjcd9w+AyabjDbxE+MwmvlDuazTu:ZhpAyazIlyazTu

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\2024-05-04_793c19d1b1924506d07f20a7f5221d9b_bkransomware.exe
    "C:\Users\Admin\AppData\Local\Temp\2024-05-04_793c19d1b1924506d07f20a7f5221d9b_bkransomware.exe"
    1⤵
    • Adds Run key to start application
    • Drops file in Windows directory
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:4948
    • 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:4332

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

    393KB

    MD5

    d75b78847a619b59258e3f55811cebc2

    SHA1

    7d901433a286d1b812982a5fbb769b31231d5765

    SHA256

    af3b2875e08fde0e08328540b3c3590e564ef160a5fdedf0d2910beb103f0d3b

    SHA512

    38c8433b97b1d6acd62872c51ca96dfc6205c388e16b826f6703ac188102d21336626d5069b036c3d1f1d81d5c4e3a6b861e46057d8989c659ee3551831c33b0

  • C:\Users\Admin\AppData\Local\Temp\QP59tV5aLkPoF5l.exe

    Filesize

    71KB

    MD5

    f179d3af0639021e2da7ea725af0e13c

    SHA1

    4501f7b3f37b16ce4b1da3900d67ddce9eff38ad

    SHA256

    8f6788b066238017da55eaca463bcef5e07dad2b3a875eaaf71f71bac20c6721

    SHA512

    461c8087450d3cd41393072e57063b16fe3af1cb0f115f44058891cb0d62671840b055c3d9120fb2af98237903ec97973acc9c9bca9690a6b9d2a1d73d5933df

  • C:\Windows\CTS.exe

    Filesize

    71KB

    MD5

    66df4ffab62e674af2e75b163563fc0b

    SHA1

    dec8a197312e41eeb3cfef01cb2a443f0205cd6e

    SHA256

    075a6eecd8da1795532318f9cf880efe42461f9464d63f74deb271d33110f163

    SHA512

    1588dd78e6e8972013c40cdb6acfb84c8df7b081197233ce621904b645356c805d0424bb93dd46c55834dc47d9ff39ee1323cf8e670841b3fff24ab98ba87f25