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Analysis

  • max time kernel
    137s
  • max time network
    146s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240226-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
  • submitted
    04/05/2024, 10:25

General

  • Target

    2024-05-04_0b9fdec44c17afee1305cfba0a5aa20b_bkransomware.exe

  • Size

    214KB

  • MD5

    0b9fdec44c17afee1305cfba0a5aa20b

  • SHA1

    0e6fa5d6d451c3b6644a0ec5b77a5ea78ce7eb9f

  • SHA256

    99acb0153f756f96c418e9e5b14d3148c3c9faba157786c2db199ac44be67c2c

  • SHA512

    aa0ef5df434940de31bd8f8c1b6943875d4f2445c48692c1b6f15c816fafdff7b9594324b769a2a74b6aa9d11c4220c34f1ce5dcc8fa68aa320f67d0e4aa7202

  • SSDEEP

    3072:ZhpAyazIlyazTmAvJMAgcayFHoh7YgB3u+2IcqUfN6eaTxvwGXVxuA3Yip:hZMazDMAFtFIWglu+kfNXaTGIeA3Yip

Malware Config

Signatures

  • Executes dropped EXE 2 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 5 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\2024-05-04_0b9fdec44c17afee1305cfba0a5aa20b_bkransomware.exe
    "C:\Users\Admin\AppData\Local\Temp\2024-05-04_0b9fdec44c17afee1305cfba0a5aa20b_bkransomware.exe"
    1⤵
    • Adds Run key to start application
    • Drops file in Windows directory
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:4764
    • C:\Users\Admin\AppData\Local\Temp\eIByJGvIrRVt3Bn.exe
      C:\Users\Admin\AppData\Local\Temp\eIByJGvIrRVt3Bn.exe
      2⤵
      • Executes dropped EXE
      PID:3472
    • 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:2780
  • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
    "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=5164 --field-trial-handle=3084,i,4016110471176367543,14287608422419064331,262144 --variations-seed-version /prefetch:8
    1⤵
      PID:2300

    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

      789KB

      MD5

      897a943e2762e153ca3a66555c85092b

      SHA1

      875b5ac29b1bc85bb3120831482d76e9ed756669

      SHA256

      bcc58a97c052cbb5d4d47dc80b8411b862fd4e3b2426e7d4161576921f7cf83b

      SHA512

      042a08a989e2ee20cdc0a83c0e41e637fc3bfc454e972ad58a46d1c86d1bb3d6fae43788eaac08efac9e08cb31ce15c33a1550ad632b31a34b02e723d38eea88

    • C:\Users\Admin\AppData\Local\Temp\eIByJGvIrRVt3Bn.exe

      Filesize

      143KB

      MD5

      2fdb371d45181dff59577110ba1064e2

      SHA1

      42a5833cb0ac90e38d734d1327bb3f7c7a6aa453

      SHA256

      80d7ec8ce3913d81ea5d4f304b8609e56f0e49778c52af9279e742ea54f4a155

      SHA512

      52982041ba9ca552b90b79b251501ec6c33c5251d09ca9969a1b179af2ec17aca6eb81db6e588e12751bcea04208e1da8d5a754a979dd98ceb3f50780aadea20

    • C:\Windows\CTS.exe

      Filesize

      71KB

      MD5

      66df4ffab62e674af2e75b163563fc0b

      SHA1

      dec8a197312e41eeb3cfef01cb2a443f0205cd6e

      SHA256

      075a6eecd8da1795532318f9cf880efe42461f9464d63f74deb271d33110f163

      SHA512

      1588dd78e6e8972013c40cdb6acfb84c8df7b081197233ce621904b645356c805d0424bb93dd46c55834dc47d9ff39ee1323cf8e670841b3fff24ab98ba87f25

    • memory/3472-8-0x00007FF894143000-0x00007FF894145000-memory.dmp

      Filesize

      8KB

    • memory/3472-9-0x00000000000E0000-0x0000000000108000-memory.dmp

      Filesize

      160KB

    • memory/3472-12-0x00007FF894140000-0x00007FF894C01000-memory.dmp

      Filesize

      10.8MB

    • memory/3472-34-0x00007FF894140000-0x00007FF894C01000-memory.dmp

      Filesize

      10.8MB