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Analysis

  • max time kernel
    121s
  • max time network
    122s
  • platform
    windows7_x64
  • resource
    win7-20231129-en
  • resource tags

    arch:x64arch:x86image:win7-20231129-enlocale:en-usos:windows7-x64system
  • submitted
    08/05/2024, 03:42

General

  • Target

    2024-05-08_04b8127757b255a0ddd8c439136249e2_bkransomware.exe

  • Size

    71KB

  • MD5

    04b8127757b255a0ddd8c439136249e2

  • SHA1

    f55213963df1a849291d52767a652148a6f07e0b

  • SHA256

    299169bc7a4687aa3fd1f1fbaa951b8a75229840ce61a06677234b5bda46817a

  • SHA512

    ac162a538746d479bf6e35e682ce2eb51ec57e529329ddf23ac4a67fbffd81f715d73c954577ccf480f1a1db14da84cd95999c6a0d8a31d1570d8131221db496

  • SSDEEP

    1536:Fc8N7UsWjcd9w+AyabjDbxE+MwmvlzuazT3m:ZRpAyazIliazT2

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 4 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\2024-05-08_04b8127757b255a0ddd8c439136249e2_bkransomware.exe
    "C:\Users\Admin\AppData\Local\Temp\2024-05-08_04b8127757b255a0ddd8c439136249e2_bkransomware.exe"
    1⤵
    • Adds Run key to start application
    • Drops file in Windows directory
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3000
    • 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:2872

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • C:\Users\Admin\AppData\Local\Temp\ML2tUNnvFVClcqF.exe

    Filesize

    71KB

    MD5

    345cb786daa30cff1aaa27e650ddb7ec

    SHA1

    4522deb2f5e8a11468c26f9f55b1fe2b12bc414e

    SHA256

    a6d06fb020f5d33c7a99d8bb8e56467659cd143b4ca93d3157495d07bd150bcb

    SHA512

    b671e8afc21e8c444620079c09d951ad74bf4ed670e00f449111d7c1494a14445ed14beb6164f3c1a5080591b4d9fceff040f188050f26f7307074b7fd1e74a7

  • C:\Windows\CTS.exe

    Filesize

    71KB

    MD5

    f9d4ab0a726adc9b5e4b7d7b724912f1

    SHA1

    3d42ca2098475924f70ee4a831c4f003b4682328

    SHA256

    b43be87e8586ca5e995979883468f3b3d9dc5212fbfd0b5f3341a5b7c56e0fbc

    SHA512

    22a5f0e4b2716244e978ee50771823926f86baf0382ece48fd049f039cf77b5eb0691d83c61148903cff081fdbea969f47b8ed521647717f42bbed5c64552432