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Analysis

  • max time kernel
    122s
  • max time network
    123s
  • platform
    windows7_x64
  • resource
    win7-20240221-en
  • resource tags

    arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
  • submitted
    07/05/2024, 05:07

General

  • Target

    2024-05-07_e9dc99295c56c46149845977c93878be_bkransomware.exe

  • Size

    131KB

  • MD5

    e9dc99295c56c46149845977c93878be

  • SHA1

    58889a3ad3eb442bc9d03ebb77dd82d7ebc55e75

  • SHA256

    8494d8b38ccf2a80a6c5079d8d9d8106c2d151f3fcffd34b350f8f3539876359

  • SHA512

    4ba0fd2229619f9c5c29df76fc0ac0ef34fbc87a0ff4f1be5d37eef9f41672b4175d1df6afe67acbd2fdde2bb27b154014e7c8cd3e14bd3accdbc2df14a7d8d0

  • SSDEEP

    3072:ZhpAyazIlyazTvJh4k+VajyPghRhqaT8D:hZMazLJeNEwcRhqJD

Malware Config

Signatures

  • Executes dropped EXE 2 IoCs
  • Loads dropped DLL 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 8 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\2024-05-07_e9dc99295c56c46149845977c93878be_bkransomware.exe
    "C:\Users\Admin\AppData\Local\Temp\2024-05-07_e9dc99295c56c46149845977c93878be_bkransomware.exe"
    1⤵
    • Loads dropped DLL
    • Adds Run key to start application
    • Drops file in Windows directory
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2128
    • C:\Users\Admin\AppData\Local\Temp\raAZblM2DBm1dUE.exe
      C:\Users\Admin\AppData\Local\Temp\raAZblM2DBm1dUE.exe
      2⤵
      • Executes dropped EXE
      PID:2412
    • 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:1192

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • C:\Windows\CTS.exe

    Filesize

    71KB

    MD5

    66df4ffab62e674af2e75b163563fc0b

    SHA1

    dec8a197312e41eeb3cfef01cb2a443f0205cd6e

    SHA256

    075a6eecd8da1795532318f9cf880efe42461f9464d63f74deb271d33110f163

    SHA512

    1588dd78e6e8972013c40cdb6acfb84c8df7b081197233ce621904b645356c805d0424bb93dd46c55834dc47d9ff39ee1323cf8e670841b3fff24ab98ba87f25

  • \Users\Admin\AppData\Local\Temp\raAZblM2DBm1dUE.exe

    Filesize

    60KB

    MD5

    7b112b1fb864c90ec5b65eab21cb40b8

    SHA1

    e7b73361f722fc7cbb93ef98a8d26e34f4d49767

    SHA256

    751941b4e09898c31791efeb5f90fc7367c89831d4a98637ed505e40763e287b

    SHA512

    bf9cdeff39cc4fa48457c55ad02e3856b5b27998535aed801a469252f01e7676462332fa3f93877753e963d037472f615c1fc5fc2e996316621b4e0a180cb5f5