Analysis

  • max time kernel
    120s
  • max time network
    99s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240611-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240611-enlocale:en-usos:windows10-2004-x64system
  • submitted
    12-06-2024 18:03

General

  • Target

    2024-06-12_a025e29726722d69fea098d6f481bb85_bkransomware.exe

  • Size

    135KB

  • MD5

    a025e29726722d69fea098d6f481bb85

  • SHA1

    b725653b4ecaf4abdedf430d803ab358267858df

  • SHA256

    3180ad517578b8327517e020661dd02304e534181496344dedbca86f4290e180

  • SHA512

    de99f4485a5bd18e0665e278515a4887705783312b2a9e5c8300945c9d5b0e0df3d725aabe05636f5021a644242abc6dbe8df6541d440d4c6da0027fa05a3d72

  • SSDEEP

    3072:ZhpAyazIlyazTP+92PXRyWLxO6I1UsvPGVA:hZMazj+0JLxOX1KW

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 6 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\2024-06-12_a025e29726722d69fea098d6f481bb85_bkransomware.exe
    "C:\Users\Admin\AppData\Local\Temp\2024-06-12_a025e29726722d69fea098d6f481bb85_bkransomware.exe"
    1⤵
    • Adds Run key to start application
    • Drops file in Windows directory
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1796
    • C:\Users\Admin\AppData\Local\Temp\JkfkgHiRPkUL63l.exe
      C:\Users\Admin\AppData\Local\Temp\JkfkgHiRPkUL63l.exe
      2⤵
      • Executes dropped EXE
      PID:2196
    • 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:744

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

    6c6a5a95342dfc8a526e61b63ec53d08

    SHA1

    eabd99474e7191133366827b2cf6539b581f3734

    SHA256

    45e826c28fc9888c033b18f7d373fda0d5a8b073a605b6ea3f7f2e7e5854019e

    SHA512

    d11e39916204c1579b59d4f13ca57ef75cc038afafb482304774e2019267b9f37504cd3ee8abc0a0d84bb7bd850097fa808c587ae656a57fbf419552f4eb18b9

  • C:\Users\Admin\AppData\Local\Temp\JkfkgHiRPkUL63l.exe

    Filesize

    64KB

    MD5

    e97c622b03fb2a2598bf019fbbe29f2c

    SHA1

    32698bd1d3a0ff6cf441770d1b2b816285068d19

    SHA256

    5c1af46c7300e87a73dacf6cf41ce397e3f05df6bd9c7e227b4ac59f85769160

    SHA512

    db70c62fb35a8e5b005f13b57c1ebbf6c465f6ff0524422294c43e27fb4aa79379dc1e300ad11dc2354405c43b192ae06b91c0f525a1f2617e4d14673651a87d

  • C:\Windows\CTS.exe

    Filesize

    71KB

    MD5

    66df4ffab62e674af2e75b163563fc0b

    SHA1

    dec8a197312e41eeb3cfef01cb2a443f0205cd6e

    SHA256

    075a6eecd8da1795532318f9cf880efe42461f9464d63f74deb271d33110f163

    SHA512

    1588dd78e6e8972013c40cdb6acfb84c8df7b081197233ce621904b645356c805d0424bb93dd46c55834dc47d9ff39ee1323cf8e670841b3fff24ab98ba87f25