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Analysis

  • max time kernel
    147s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240508-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
  • submitted
    04/07/2024, 18:51

General

  • Target

    2024-07-04_47604d39b4af645d5933728d075861c8_bkransomware.exe

  • Size

    76KB

  • MD5

    47604d39b4af645d5933728d075861c8

  • SHA1

    17c09b3500572e7c6b7ef37c77b1745608d9ecee

  • SHA256

    a4fb338f9b0835ee7f43ddf1aa6a5687119a4cb3a70a41828998de7d5c23c659

  • SHA512

    7da6d391c50b8fad42a58a5289b9775a0be004b8be8711e8dbc46d493fda318d672acabe77fe1f7bbfbbf693d3e7a785e1ffdf4ebb3f0976bdda1bcb0cdde44c

  • SSDEEP

    1536:Fc8N7UsWjcd9w+AyabjDbxE+MwmvlzuazTCxFz:ZRpAyazIliazTCTz

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\2024-07-04_47604d39b4af645d5933728d075861c8_bkransomware.exe
    "C:\Users\Admin\AppData\Local\Temp\2024-07-04_47604d39b4af645d5933728d075861c8_bkransomware.exe"
    1⤵
    • Adds Run key to start application
    • Drops file in Windows directory
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2340
    • 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:1092

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

    394KB

    MD5

    b4481d97433493c2dcc4b8be6de41f64

    SHA1

    ea6fae4fc8c1176611c51db180e120774ebbf428

    SHA256

    2fed8861001760672ff432640501898c3433e1fb217a696b60549f61b0b83532

    SHA512

    27570f903ee2c14bbcc83d72192272c79ee6ba18198b282835fa17609774f70887362f2583bf3e110d71be428a921aee918b2db734a0738e4ec16295c114d746

  • C:\Users\Admin\AppData\Local\Temp\TM7MWEaSH9Inm6c.exe

    Filesize

    76KB

    MD5

    0e61d30aabdede8722b45d8e73ba87a8

    SHA1

    d62c3a234dabb635dcf797e91da7ba9e2d3a30e6

    SHA256

    b4ac4c0f6e9548fa6d3d936aeb2550a28c376950e382d1004dbc771f6eeb81f9

    SHA512

    000709b0a74854f8d4594065e02346c7d329d2272e0695988b058f65e33705f0abeb0ef488a812c06de907dc56a3561d59be7c329df00cddcd37e6306a577f38

  • C:\Windows\CTS.exe

    Filesize

    71KB

    MD5

    f9d4ab0a726adc9b5e4b7d7b724912f1

    SHA1

    3d42ca2098475924f70ee4a831c4f003b4682328

    SHA256

    b43be87e8586ca5e995979883468f3b3d9dc5212fbfd0b5f3341a5b7c56e0fbc

    SHA512

    22a5f0e4b2716244e978ee50771823926f86baf0382ece48fd049f039cf77b5eb0691d83c61148903cff081fdbea969f47b8ed521647717f42bbed5c64552432