Analysis

  • max time kernel
    132s
  • max time network
    124s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240508-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
  • submitted
    26/05/2024, 10:41

General

  • Target

    2024-05-26_8ea90cd710a570f5d3c737e1113156c6_bkransomware.exe

  • Size

    170KB

  • MD5

    8ea90cd710a570f5d3c737e1113156c6

  • SHA1

    3a69166056f787b3377d86773dc93234e8c9afb5

  • SHA256

    a84ddfc94e595d086ba20fcd54691695454f246a084e4a1d55dd67b33d3cf3d3

  • SHA512

    cd775fe137de0a10abf247b15b4e09fa2d0866ff26da1bd977004cb5ad3cc71317294243e630873c03a17882d2ecc7b4075857985b50e3fc78a6859d95bf0fc8

  • SSDEEP

    3072:ZRpAyazIliazTjbAbvejKQyaEnTSNG4gklU1iJ3hh/POyBP4D:xZ8azH2eDyammG4gbgJjXh4D

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\2024-05-26_8ea90cd710a570f5d3c737e1113156c6_bkransomware.exe
    "C:\Users\Admin\AppData\Local\Temp\2024-05-26_8ea90cd710a570f5d3c737e1113156c6_bkransomware.exe"
    1⤵
    • Adds Run key to start application
    • Drops file in Windows directory
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1328
    • C:\Users\Admin\AppData\Local\Temp\3wBzXXGCl91qnQC.exe
      C:\Users\Admin\AppData\Local\Temp\3wBzXXGCl91qnQC.exe
      2⤵
      • Executes dropped EXE
      PID:3636
    • 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:1220

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

          392KB

          MD5

          3e4d98460774bd53a9eaa1f6af10b66e

          SHA1

          7e15bf407bf7f3149e0b692a31a0744c5b6607c4

          SHA256

          f0282689ac56081c789bed84fdb05ab75d50549f20a122b2aa669a2313cca57a

          SHA512

          0860f06d45b398cfbafca7c1fe07707eb8adacc735d67a4958936b526aed052b8526b8478fb8d44c1f8ca96644baba7fedcb1719d8a93990dfabf74c67eed0d9

        • C:\Users\Admin\AppData\Local\Temp\3wBzXXGCl91qnQC.exe

          Filesize

          170KB

          MD5

          b5b3dd398fd7093bc948369d7f25829a

          SHA1

          62e6b25c5cbca56b5b8dde82fb66bac69932f859

          SHA256

          88b594ed50f8a31d5be23cefcd8c191e8cbf853b253a4aa896c5eecc9bd5d0ba

          SHA512

          6a0832f85cbab01d0691c5072861511c2bedc6d840bbfd02ae95d12d1d550ad5746f2ea0d91f2eaeedce37806a521694e94eea3b75ba44b2a3cc221c4c96d699

        • C:\Users\Admin\AppData\Local\Temp\3wBzXXGCl91qnQC.exe

          Filesize

          99KB

          MD5

          af88cab288e8213a11a7ea5313363d31

          SHA1

          cb769e3246d5244a0040621e919f7c519ba49986

          SHA256

          7407fac6e170430f34322202b73aa392431b5c2c49e15304fb255bb24c540366

          SHA512

          a4e353fcb78579345d4c5bc1f48970b473e0499dfe5bc6abeffb669295fa2940ce8637045a11f881fe88dd9b97d380ae9a8eed1b94fbd47181e0b4eb427e9679

        • C:\Windows\CTS.exe

          Filesize

          71KB

          MD5

          f9d4ab0a726adc9b5e4b7d7b724912f1

          SHA1

          3d42ca2098475924f70ee4a831c4f003b4682328

          SHA256

          b43be87e8586ca5e995979883468f3b3d9dc5212fbfd0b5f3341a5b7c56e0fbc

          SHA512

          22a5f0e4b2716244e978ee50771823926f86baf0382ece48fd049f039cf77b5eb0691d83c61148903cff081fdbea969f47b8ed521647717f42bbed5c64552432