Analysis

  • max time kernel
    93s
  • max time network
    95s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240426-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240426-enlocale:en-usos:windows10-2004-x64system
  • submitted
    03-06-2024 09:31

General

  • Target

    2024-06-03_364e0b86d674ba928843dadc91e7dad5_bkransomware.exe

  • Size

    74KB

  • MD5

    364e0b86d674ba928843dadc91e7dad5

  • SHA1

    f6be43700984bab074063a4d8cabac8307777d0f

  • SHA256

    2d5736e6f39945d5f06223a6c75e9103f6ede7702890bf2496e5c8fa982350a7

  • SHA512

    494ec796e6bd05a7f0a9b4973abebbe5cbd566b60810fdd22fd3a763f8610707d6259ac65c4a3fa21dbc13c24f2857f89b4b2529d0a49edb6eb851e8b885d195

  • SSDEEP

    1536:Fc897UsWjcd9w+AyabjDbxE+MwmvlDuazTmmTb:ZhpAyazIlyazTVb

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\2024-06-03_364e0b86d674ba928843dadc91e7dad5_bkransomware.exe
    "C:\Users\Admin\AppData\Local\Temp\2024-06-03_364e0b86d674ba928843dadc91e7dad5_bkransomware.exe"
    1⤵
    • Adds Run key to start application
    • Drops file in Windows directory
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:400
    • 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:2816

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

    d9406c7d377145a44e5624813c6f4bd0

    SHA1

    6b560d0843793c08ae54396e15f54e21699bb565

    SHA256

    8235d2948df383380676a815a8315f20dd791118c329a1122b8e0351e1cb059e

    SHA512

    5c68c1f4f8453035d92112d97b7002bcaadca944ec59e719032ab92d82e4ab74dd6ce1ed1dbf3e2f4cef1419aa10b6a69daeaea85e438ee8ecc2a4f75da656bf

  • C:\Users\Admin\AppData\Local\Temp\XLgKq16ju0jWInM.exe

    Filesize

    74KB

    MD5

    43a46f42250240a11aa7619f4d0f1039

    SHA1

    5ce6874f9e4b3ff89ab3ba1952a3680148135429

    SHA256

    1d6d7144127d635c0edc6332185667480cbd64ebd4bcc279e9ecbd9b82a3777e

    SHA512

    550f063d40b1446b114d43285a51bfaa229a5e0960c57425ccd4b768257ff16843ded3f5e6dd08b4670a87ff82666ffa0e672500fcd47ae5674295a62a61054a

  • C:\Windows\CTS.exe

    Filesize

    71KB

    MD5

    66df4ffab62e674af2e75b163563fc0b

    SHA1

    dec8a197312e41eeb3cfef01cb2a443f0205cd6e

    SHA256

    075a6eecd8da1795532318f9cf880efe42461f9464d63f74deb271d33110f163

    SHA512

    1588dd78e6e8972013c40cdb6acfb84c8df7b081197233ce621904b645356c805d0424bb93dd46c55834dc47d9ff39ee1323cf8e670841b3fff24ab98ba87f25